hi just have a question, howcome my newly bought xp 2000 energizer could not fully charge my sgs2? seems that it can only charge my phone 80%.
These were the following conditions when I used XP 2000:
1. xp 2000 was at full charge
2. my phone was turned off
3. my phone was not drained, still had around 10% charge.
I noticed like around 80% of charging, a temperature icon showed blinking as if the battery was heating up(sorry i don't have a screenshot).When I tried to unplug xp 2000 from the phone, the charger no longer have lights on, as if it got drained w/o fully charging my phone..
This is my 2nd of unit of xp2000. The store where i bought it replaced the first one thinking that it might be defective but same goes for the new one..
the temperature icon I mentioned only shows up whenever I use xp 2000.
Well the Charger can store some amount less than 2000mAh of Energy. The SGS2 battery is rated at 1650mAh. So in theory you have 350mAh of additional power in the pack than you should need however the battery is still draining while it is being charged (the SGS2 can draw up to 1A current according to specs and even in the deep sleep state I wouldn't be surprised if it draws 50-100mA since the hardware doesn't support true power gating. I mention earlier that while the charger is rated at 2000mAh it can probably on store up to 90% of this value aka 1800mA.
In summary:
The capacity of the power pack is closer to 1800mAh that 2000mAh.
The phone draws significant power even in deep sleep.
There is additional power lost by transmission and charger control circuitry in both the power pack and the charge controller in the phone.
There are additional reasons but those are the main ones.
That is why you cannot fully charge it with a power pack.
Please press thanks if you find this information useful.
Poulsen8r said:
Well the Charger can store some amount less than 2000mAh of Energy. The SGS2 battery is rated at 1650mAh. So in theory you have 350mAh of additional power in the pack than you should need however the battery is still draining while it is being charged (the SGS2 can draw up to 1A current according to specs and even in the deep sleep state I wouldn't be surprised if it draws 50-100mA since the hardware doesn't support true power gating. I mention earlier that while the charger is rated at 2000mAh it can probably on store up to 90% of this value aka 1800mA.
In summary:
The capacity of the power pack is closer to 1800mAh that 2000mAh.
The phone draws significant power even in deep sleep.
There is additional power lost by transmission and charger control circuitry in both the power pack and the charge controller in the phone.
There are additional reasons but those are the main ones.
That is why you cannot fully charge it with a power pack.
Please press thanks if you find this information useful.
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ok thank you! one rep from energizer had somewhat a similar explanation.Well, I guess I'd have to accept it as is... If only I knew, I could've bought one that has a higher mAh, like xp 4001... so sad.... anyway appreciate it!
On theory, a 2000mAh is capable of charging a 1650mAh battery as long as power is not lost through other means.
Most of these battery packs do not have a Zener Diode, you might want to modify it to add it in. This will allow your 2000mAh pack to charge your 1650mAh battery for 1 time only.
LiFE1688 said:
On theory, a 2000mAh is capable of charging a 1650mAh battery as long as power is not lost through other means.
Most of these battery packs do not have a Zener Diode, you might want to modify it to add it in. This will allow your 2000mAh pack to charge your 1650mAh battery for 1 time only.
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Click to collapse
How can I modify it? sorry..
I use an xp2000 with my S2 - but I think of it as a battery extender, rather than as a primary means of recharging it. I use it when I'm working & the battery's getting a little low - it can keep ahead of the phone and gives me another 3-4 hours in total. The great advantage (over a spare battery) is that I don't have to power down, so if I'm downloading, for example, and I don't think the battery will make it to the end of the download, then I just plug in the xp2000 & the problem is solved.
I have lots of different ways of charging - mains & car chargers, USB cables, spare batteries - and find the xp2000 is a useful addition that sometimes saves the day. It's just the right size & weight to be able to carry around without having to think about whether you really need it - so it's always there when you do.
If you're using any state-of-the art smartphone intensively, it helps to have a variety of recharge options, and to take advantage of any opportunities you may have to top up during the day, thus keeping ahead of the phone's discharge curve.
Related
Can anyone recommend a faster charger? The wall charger still takes upwards of 3-4 hours to charge, was hoping there was something that puts out some more power.
How many amps does the stock charger put out/how much can the phone 'handle'? (Sorry, I've never messed around with circuits and electronics like that, I'm not sure what the correct terms are)...
For example, http://www.amazon.com/Scosche-reVIVE-Dual-Charger-iPad/dp/B003N7NO4Q that car charger has a 2.1a socket, meant to charge the ipad, would that, in theory, charge the sgs2 quicker than a standard car charger, putting out ~1amp?
edit: realized this is better suited for the accessories forum, feel free to move.
I believe the wall charger is the fastest charger that we have available. I could be wrong, but I haven't found anything faster.
If you turn off your phone and throw it on the wall charger, it will charge faster as the phone is not on to use any battery... but thats probably not what you're looking for.
Your best bet would be to buy an extra battery and external charger and just swap the batteries when they are low. Thats what I do, and its much better than keeping your phone plugged in most of the day.
Our phone has an internally set 650 mA charge current limit - adding a beefier charger won't do anything.
It doesn't help that Samsung put in a crippled charger chip in our device with nonadjustable current, instead of using the more capable one already present in the MAX8997...
and even if the phone lets it charge faster, you really dont want a charger that charges too fast. I'm pretty sure that will murder the battery.
Thanks for the answers, all.
penguinlogik said:
Your best bet would be to buy an extra battery and external charger and just swap the batteries when they are low. Thats what I do, and its much better than keeping your phone plugged in most of the day.
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This is fine for "emergencies," but swapping batteries will throw off your battery stats.
Rrryan2 said:
This is fine for "emergencies," but swapping batteries will throw off your battery stats.
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Click to collapse
How would swapping batteries thow off battery stats? It seems like everything resets once you boot up with the new battery, and isn't battery charge read off the raw voltage?
Lithium Ion batteries require a very particular two-step charging procedure. The battery has to be charged at constant current until the voltage rises to 4.2V, and then it needs to be charged at constant voltage (4.2V) until the charge current drops to about 10% of its starting value.
The amount of current allowed in the CC phase is a function of the battery's chemistry and capacity. It's expressed as some multiple or fraction of "C", the capacity of the battery. A 1C charge rate on a 1000mAh battery is 1A. The large LiPo batteries I use for my RC Heli and Airplane fleet will charge at 5C, for some of them this is better than 10A. But Li-Ion batteries usually can't tolerate more than 1C (and they usually charge at half that rate since this makes them last longer).
The harder you push the charge rate, the faster you wear out the battery and the more likely it is to fail. If you exceed the maximum charge rate, the battery is very likely to fail catastrophically (failure = fire). I charge my big LiPo batteries in a fireproof box for this reason.
My advice is, leave the phone's charging circuit alone unless you know what you're doing.
penguinlogik said:
How would swapping batteries thow off battery stats? It seems like everything resets once you boot up with the new battery, and isn't battery charge read off the raw voltage?
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Sure, it reads raw voltage. But the top end and bottom end worsen as the battery ages, and batterystats.bin doesn't know where those values are for a given battery until it's seen them. The system wasn't really designed to take into account the user swapping in multiple batteries.
Rrryan2 said:
Sure, it reads raw voltage. But the top end and bottom end worsen as the battery ages, and batterystats.bin doesn't know where those values are for a given battery until it's seen them. The system wasn't really designed to take into account the user swapping in multiple batteries.
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Huh... I'll let you know in a year how this battery swapping thing goes then. But wouldn't wear be the same on both batteries if I just swap them daily?
penguinlogik said:
Huh... I'll let you know in a year how this battery swapping thing goes then. But wouldn't wear be the same on both batteries if I just swap them daily?
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I did this with my captivate where I would swap batteries everyday. Much better than charging if you ask me.
Is it better to charge them separately?
From what I heard, the dock charges the Tablet. So if I charged with the two connected, the dock would charge, and it would in turn charge the Tablet...sounds kind of inefficient to me, and maybe even bad?
I usually charge my TF101 tablet from it's dock and have done so since September, perfectly fine and no negative impact on the battery. Just don't make a habbit of burning the batteries too low, like 1% before you charge.
My dock does drain a little faster after having gone through a bunch of heavy discharges but that's why I usually charge before I get to like 3% .
Spidey01 said:
I usually charge my TF101 tablet from it's dock and have done so since September, perfectly fine and no negative impact on the battery. Just don't make a habbit of burning the batteries too low, like 1% before you charge.
My dock does drain a little faster after having gone through a bunch of heavy discharges but that's why I usually charge before I get to like 3% .
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That's odd since it is recommended that you run the batteries down before charging them instead of putting it on the charger before it gets below 10%. Charging them without running the power down has a negative effect on the amount of charge it can hold.
That is not required anymore.The ideal charge level for these batteries is about 40%.
Charge cycles aren't a problem either so discharge is required once a month or even more.
These devices use LiPo and Co batteries.
For these, it is recommended NOT to fully let the battery discharge (unlike older batteries with memory effect).
It is however recommended to fully charge then fully discharge your battery ONCE when you first use it on order to calibrate the battery (ie: let the software learn what level means full and what level means empty)
Sent from my GT-I9100 using XDA App
eraursls1984 said:
That's odd since it is recommended that you run the batteries down before charging them instead of putting it on the charger before it gets below 10%. Charging them without running the power down has a negative effect on the amount of charge it can hold.
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You can check the link in my Sig. there is some info on recent batteries and calibration.
Yup, running it till it shuts off is mainly to calibrate the battery gauge. Most Lion batteries have auto shutoffs built into them to prevent discharging past the point of no return (which is why ebay batteries are so cheap, usually they lack this and other features, like temp sensors to kill the device before it melts)
As to charging both devices, i dont see how charging each together would harm anything aside from running more power through the dock might eventually wear it out? Honestly i dont think you have anything to worry about XD
But I can see the dock being discharged to zero so often. So far it has happened 4 times without me even knowing it since its often connected to the tablet. I wish there was a way to use the dock and disable the charging to the tablet.
Its better to have a few full discharge n full charge cycle for any new battery operated product to maximize the new battery capacity after a few cycles it will reach its peak capacity.
iceman127 said:
Its better to have a few full discharge n full charge cycle for any new battery operated product to maximize the new battery capacity after a few cycles it will reach its peak capacity.
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Click to collapse
But I'm sure on many occasions just by the usage and nature of the dock that it will end up being drained to 0% quite often. I don't think my dock battery will survive too long -.-
Just gonna review some of the accessories I have used and what i think about 'em
First up is the 3500mAH extended battery by HHI
This battery came in at a cost of $9.99 with free Shipping! It showed up with an 80% charge which is in the acceptable range of where they like to sit. The battery performs just as one would expect it too. I am currently running MeanRom, and can easily get 16-20 hours of use with some really heavy gaming. However I recently went on a vacation and wanted to run the battery through a couple different variations of "discharging". So with the phone in Airplane mode(no radios connected) and very little use i easily can get a week out of the phone without charging. Again this is without any radios on, not connecting to anything.The stock battery cant touch these numbers. i would be lucky to get a full day out of the stock battery with no gaming and normal use.I didn't do a sticker pull to run the numbers. So I'm taking HHI's word on the 3500mAH being just that.
To conclude on this battery the $10 investment turned out to be a good choice, although it might not be a seidio or something it does more than i expected it to do. I will continue to use this battery till I get rid of the phone. The battery can be found here.
To continue on the batteries,
I also bought some of the Galilio "2000mAH" batteries, I got 3 of them with a wall charger for $13.99 on ebay, as reviewed by many others.
This is my experience with them. So they showed up in the mail and upon opening them i discovered one of the batteries look like it got dropped or skipped accross the cement, im not sure what happened, but who is gonna put a messed up battery in their phone.. So i really only got 2 batteries. I brought it up to the seller he offered me $3.00 back, it wasn't worth my time even dealing with that any further at this point. Anyways the batteries Are nice little backup batteries i take with me on trips.They make for easy backup batteries. The batteries have been suspected to be somewhere along the lines of 1000-1200mAH. I would have to agree, even with no testing with any type of tool, besides my phone. They last a most couple of hours. The wall charger that came with them actually surprised me. Everyone was reporting that it may overcharge your stock battery, which can cause some issues. This charger(as pictured below) will charge the Galilio batteries to 100% with no problems. I put my stock HTC battery into the wall charger and with repeated attempts the charger will not charge the battery past 85% even when i left it on the wall charger for 2 days. I do believe that the stock HtC charger that came with the phone gives the batteries a "better" charge, but the wall charger seems to not charge the batteries past a safe range as everyone seems to be reporting as a possible issue. My issue is it doesn't charge it well enough.
I've attached some pictures of the battery results and of the batteries.
Reserved for more... case reviews coming up next
i got the 3500 mAh from HHI. great battery, even better price.
Yea that battery is awesome!
Sent from my PG86100 using Tapatalk
Going to try this battery out. Thanks for the review.
The 85% is charge limit is what a cheap charger do,
The "charger" that come with the phone is simply a power supply, the charging circuit is actually "built in" to the phone. You can connect the OEM HTC charger/power supply into one of those cheap aftermarket dock that charge a 2nd battery and it will never charge the battery past 85% either.
To make it short and sweet
There's 2 stage of Li-ion charging
1) charge to 4.2v at constant current which is 85% when it first reach/near 4.2v
2) saturation charge, once the battery reach 4.2v, continue charging but at gradually reducing current until it reach about 3% of default charge current
Cheap charger have a simple/cheap circuit and cannot do stage 2 charging, where the charging circuit built into each phone would do stage 2 charging
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
bitslizer said:
The 85% is charge limit is what a cheap charger do,
The "charger" that come with the phone is simply a power supply, the charging circuit is actually "built in" to the phone. You can connect the OEM HTC charger/power supply into one of those cheap aftermarket dock that charge a 2nd battery and it will never charge the battery past 85% either.
To make it short and sweet
There's 2 stage of Li-ion charging
1) charge to 4.2v at constant current which is 85% when it first reach/near 4.2v
2) saturation charge, once the battery reach 4.2v, continue charging but at gradually reducing current until it reach about 3% of default charge current
Cheap charger have a simple/cheap circuit and cannot do stage 2 charging, where the charging circuit built into each phone would do stage 2 charging
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
Click to expand...
Click to collapse
im just saying its not gonna over charge your battery like everyone warns you about all over the place lol
Makis709 said:
Going to try this battery out. Thanks for the review.
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Click to collapse
Awesome!!! its well worth it!!
Guys I bought one Samsung Extended battery kit (2000mHa - genuine) last week and it worked a charm, noticed a considerable increase in battery life when compared to the stock battery 1650mha.
However on the weekend my Galaxy ran flat and now charging the phone, the phone starts charging, boots up, Samsung flash screen appears, then loads the main screen, stays there for 5 - 10 seconds, then phone powers down and turns off
I have tried several chargers, Blackberry (700ma) and the original Galaxy charger (USA charger - I live in Australia). I have read a few reviews that suggests I may need a higher output charger, maybe a 800ma or 1000ma charger? Would this be correct?
If the phone is still got charger, say 30% battery remaining, and I charge it using a Blackberry or Samsung charger, the phone charges fine, if its completely flat, it won't charge at all.
The phone has not been rooted and I am also running the 2000mHa extended battery mentioned in this post.
Any ideas to why the phone boots up, stays on for 5 seconds and turns off?
Info on charging rates for batteries:
--------------------------------------------------------------------------------
Li-Po (cell phone, RC car) batteries are pretty unstable when compared to NiMh/NiCd (AAs, reg Automobile) batteries.
When Li-Po's first started coming into the Remote Control Car Hobby, the big thing I was told to watch out for, and follow to a T was the charging and discharging rates, because if you neglected them, that's when the cells would swell and possibly burst into flames.
Rule of thumb is never charge at more than a 1C rate or exceed the batteries voltage, meaning if it's a 2000mAh battery, don't charge at more than 2.0A, if it's a 1750mAh battery, no more than 1.75A, and if it is a 1355mAh battery, no more than 1.355A and so on and so on.
For our stock, single cell(3.7V) Li-Po 1850mAh battery, the perfect, ideal charge rate would be no higher than 1.85A at 3.7V.
It blows me away that the stock charger is 5.0V, but Samsung obviously approved it so...Whatever.
I can almost guarantee you that our phones would never discharge at more than the batteries max rating.
To sum this up - don't charge it at more than 1.85A and 5.0 Volts and you should be fine. If you can use a charger with les voltage than 5.0V, I would use that one...
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One its a question in the wrong forum .
When flat does it not charge with phone powered off as normal charging practice for a dead phone .
jje
I have noticed this.
My theory is the phone does not charge while booting. So what little charge you had put in, would only be enough to boot, then by the time it can fully boot to charge again, it doesn't have enough power to stay up so it boots off.
If you left the charger on with the phone off for 10 min, should have enough to power up and stay powered. Try that.
Anybody have tips on the subject? I was reading around and read multiple articles on this. Many said do not keep it on the charger after it has reached 100%. This poses a problem, because the G2 will charge from 0-100 in nearly 1 hour and 30 minutes, and i like to keep it on the charger while i sleep. Does the G2 have software to prevent this? It does say to please remove charger to conserve energy when its full.
Any replies are much appreciated
Sent from my LG-D800 using xda app-developers app
Well i read also that you shouldnt charge it to 100% frequently
2. You shouldnt let the battery charge drop under 20 frequently Before recharging
3. You shouldnt let the battery run out of charge frequently because our battery will get damaged if u do that quite often
so beware of this point
And they said it's not best to let the phone charge over night frequently
Sent from my LG-D802 using XDA Premium 4 mobile app
I am no expert in this area - but this is what i do and i seem to get great battery life. i just looked, my device has been on battery for 3.5 hours and i'm still at 100% with usage in the following areas...
Google serviced - 29%
Android system - 22%
Screen - 17%
this is with wifi on, approx 5 min worth of voice calling, and several text messages, couple min of facebook and G+. i am not rooted, running stock launcher with most recent tmobile software update (unlocked and using it on Bell).
I hard reset my device once a month (minimum) - not sure if this does anything, but i am a little OCD when it come to my devices.
Before hard reset...
1. charge device to 100%
2. keep device plugged in for ~15 min after fully charged. The unplug.
3. hard reset device
4. once booted, plug device in a proceed to setup and install programs
5. unplug device once complete
During the day...
I always keep it charged up...i dont usually let it get below 75% (if possible). I'm always around a charger/plug at my work.
During the night...
1. charge device to 100% before going to bed
2. before you go to sleep, unplug device and put it in airplane mode
3. when you get up - turn off airplane mode and plug in for ~15 min or so
Again - im no expert, but this is working for me so imma stick to it!
It is not recommended to keep your phone plugged in after it has reached 100%. Only do it when you need an extra battery boost for the day (and that's hopefully not every day).
The general rule is to charge it from 40%-80% and that partial charges are better than full charges.
I really wish people would stop with the "don't keep it on the charger" nonsense which then makes people think they need to micromanage the charge cycle.
Charge early and often. Don't intentionally drain it down to some low percent, just charge nightly and you should be fine. If you're heavily using the phone, try to avoid dropping below 30%. Heavier discharges cause faster ageing.
And avoid keeping it in a hot environment, north of 30C. If it's your car GPS, keep a vent blowing cool air on it, especially in the summer. During the winter make sure a vent isn't blowing hot air on it.
Heat is probably the primary variable in battery life, followed by heavy discharge cycles.
Do whatever you want regarding keeping it charging after it's full. But disagreeing doesn't make your statement correct. I do agree with your statements about heat, however.
Sent from my LG-D802 using XDA Premium 4 mobile app
just charge the thing and use it, I have a Samsung Galaxy S2 2-3 years ago the battery still going strong, most of you dont even own a phone past a year.
I usually make my phone go as long as it can. My previous phone, an iPhone 4, lasted almost three years.
Sent from my LG-D802 using XDA Premium 4 mobile app
vPro97 said:
I usually make my phone go as long as it can. My previous phone, an iPhone 4, lasted almost three years.
Sent from my LG-D802 using XDA Premium 4 mobile app
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the battery will last 3 years, its lithium battery, some people still own old phones like Iphone 4 and the battery still good.
battery is battery, just dont let it over heat and it'll be fine. stop trying to squeeze every second out of the battery and enjoy the phone...
I always thought it stopped charging at 100 but when it looses a little bit on the charger it charges it back. I thought that's why it said to conserve energy....as in energy from your house.
Sent from my VS980 4G using xda app-developers app
It's an established fact that keeping the phone at charged state between 40%-80% is most optimal (causes least stress) for the battery.
But of course, don't let that get in the way of your daily usage routine and cause you incovenience.
Battery is, afterall, consumable and is meant to be replaced.
I'm afraid there are lots of ill-informed people who insist that their batteries do not deteriorate. Congrats to them, they just find the solution that solves the global energy crisis.
How Often Should I Charge My Gadget's Battery to Prolong Its Lifespan?
http://lifehacker.com/5875162/how-often-should-i-charge-my-gadgets-battery-to-prolong-its-lifespan
If you like to get more technical, there's good information from the Pros.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Here's my notes from a few years ago.
--------------------------------------------------------
Li-Ion Battery
(From Wiki) During discharge, lithium ions Li+ carry the current from the negative to the positive electrode, through the non-aqueous electrolyte
and separator diaphragm.[7]
During charging, an external electrical power source (the charging circuit) applies a higher voltage (but of the same polarity) than that
produced by the battery, forcing the current to pass in the reverse direction. The lithium ions then migrate from the positive to the
negative electrode, where they become embedded in the porous electrode material in a process known as intercalation.
Prolonging battery pack life (from wiki)
+ Avoid deep discharge and instead charge more often between uses, the smaller the depth of discharge, the longer the battery will last.
+ Avoid storing the battery in full discharged state.
+ Li-ion batteries should be kept cool; they may be stored in a refrigerator.
+ The rate of degradation of Li-ion batteries is strongly temperature-dependent; they degrade much faster if stored or used at higher temperatures.
+ Li-ion has no memory effect.
+ Li-ion does not need to be fully charged.
+ In fact, it is better NOT to fully charge, because high voltages stresses the battery.
+ Li-ion cannot absorb overcharge, and when fully charged the charge current must be cut off =>
+ To minimize stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as short a time as possible. (meaning do NOT overcharge)
+ Some portable devices sit in a charge cradle in the on position. The current drawn through the device is called the parasitic load and
can distort the charge cycle. Battery manufacturers advise against parasitic load because it induces mini-cycles.
What does that mean to us? Don't use when it's plugged in?
+ A portable device must be turned off during charge. This allows the battery to reach the set threshold voltage unhindered, and enables terminating charge on low current.
+ Li-ion should never be discharged too low.
+ Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week.
Simple Guidelines for Charging Lithium-based Batteries (from batteryuniversity.com)
+ A portable device should be turned off while charging. This allows the battery to reach
the threshold voltage unhindered and reflects the correct saturation current responsible to
terminate the charge. A parasitic load confuses the charger.
+ Charge at a moderate temperature. Do not charge below freezing.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
+ Chargers use different methods for “ready” indication. The light signal may not always indicate a full charge.
+ Discontinue using charger and/or battery if the battery gets excessively warm.
+ Before prolonged storage, apply some charge to bring the pack to about half charge.
+ Over-discharged batteries can be “boosted” to life again. Discard pack if the voltage does not rise to a normal level within a minute while on boost.
Conclusion:
+ A portable device should be turned off while charging.
+ Avoid deep discharge and instead charge more often between uses.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
G1_enthusiast said:
just charge the thing and use it, I have a Samsung Galaxy S2 2-3 years ago the battery still going strong, most of you dont even own a phone past a year.
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I've had (and still have) the Samsung Galaxy S2 for over 2 years, and I had to replace the battery a little over half a year ago due to the dreaded battery bulge (I could spin my battery on the table). So yes, batteries do go bad and they can go bad in a short period of time. And yes, if this happens to the G2 with its non-removeable battery, that really sucks.
beezar said:
I've had (and still have) the Samsung Galaxy S2 for over 2 years, and I had to replace the battery a little over half a year ago due to the dreaded battery bulge (I could spin my battery on the table). So yes, batteries do go bad and they can go bad in a short period of time. And yes, if this happens to the G2 with its non-removeable battery, that really sucks.
Click to expand...
Click to collapse
did you leave it in 150 degrees heat?
I almost always turn off my phone if I know its gonna be 100+ outside and 150 in my car. its commonsense.
votinh said:
Here's my notes from a few years ago.
--------------------------------------------------------
Li-Ion Battery
(From Wiki) During discharge, lithium ions Li+ carry the current from the negative to the positive electrode, through the non-aqueous electrolyte
and separator diaphragm.[7]
During charging, an external electrical power source (the charging circuit) applies a higher voltage (but of the same polarity) than that
produced by the battery, forcing the current to pass in the reverse direction. The lithium ions then migrate from the positive to the
negative electrode, where they become embedded in the porous electrode material in a process known as intercalation.
Prolonging battery pack life (from wiki)
+ Avoid deep discharge and instead charge more often between uses, the smaller the depth of discharge, the longer the battery will last.
+ Avoid storing the battery in full discharged state.
+ Li-ion batteries should be kept cool; they may be stored in a refrigerator.
+ The rate of degradation of Li-ion batteries is strongly temperature-dependent; they degrade much faster if stored or used at higher temperatures.
+ Li-ion has no memory effect.
+ Li-ion does not need to be fully charged.
+ In fact, it is better NOT to fully charge, because high voltages stresses the battery.
+ Li-ion cannot absorb overcharge, and when fully charged the charge current must be cut off =>
+ To minimize stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as short a time as possible. (meaning do NOT overcharge)
+ Some portable devices sit in a charge cradle in the on position. The current drawn through the device is called the parasitic load and
can distort the charge cycle. Battery manufacturers advise against parasitic load because it induces mini-cycles.
What does that mean to us? Don't use when it's plugged in?
+ A portable device must be turned off during charge. This allows the battery to reach the set threshold voltage unhindered, and enables terminating charge on low current.
+ Li-ion should never be discharged too low.
+ Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week.
Simple Guidelines for Charging Lithium-based Batteries (from batteryuniversity.com)
+ A portable device should be turned off while charging. This allows the battery to reach
the threshold voltage unhindered and reflects the correct saturation current responsible to
terminate the charge. A parasitic load confuses the charger.
+ Charge at a moderate temperature. Do not charge below freezing.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
+ Chargers use different methods for “ready” indication. The light signal may not always indicate a full charge.
+ Discontinue using charger and/or battery if the battery gets excessively warm.
+ Before prolonged storage, apply some charge to bring the pack to about half charge.
+ Over-discharged batteries can be “boosted” to life again. Discard pack if the voltage does not rise to a normal level within a minute while on boost.
Conclusion:
+ A portable device should be turned off while charging.
+ Avoid deep discharge and instead charge more often between uses.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
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Just because it is on a wiki does not mean it is correct. Anyone that purports that current flows from negative to positive, is clearly not an engineer, and thus not a subject matter expert (I stopped reading right there so excuse if I'm repeating).
Heat, be it from charging, discharging, or environment, and over discharge, or improper charging are the primary reasons batteries lose capacity. Lithium polymer batteries will lose some of its initial capacity after a thousand or so charge-discharge cycles, but this is very much dependent on the charging rate used to charge the battery. If the charge rate is 0.5C or less, there is much less capacity loss (if any) over time. Charge rates of 1C and over, generate significant heat that deteriorates the cell chemistry over time, reducing capacity.
If I can ever kill my battery enough, I'll throw this phone on my charge profiler at work to see what charge rate it uses.
BTW, my two year old GSII is on its original battery and lasts all day with 40% left at the end of the day. I charge over night with no ill effects, but I never expose the phone to excessive heat.
T
Sent from my VS980 4G using Tapatalk 2
I slow charge my phone using a 500mA iPhone Cube brick and microUSB cable for overnight charging. Charging this way takes hours. I use quick charge in my car and office if needed.
A good charger should trickle charge once its 100% just to keep it up.
Sent from my VS980 4G using XDA Premium 4 mobile app
So our phones do not come with a good charger?
Sent from my VS980 4G using xda app-developers app
tedkunich said:
Just because it is on a wiki does not mean it is correct. Anyone that purports that current flows from negative to positive, is clearly not an engineer, and thus not a subject matter expert (I stopped reading right there so excuse if I'm repeating).
Heat, be it from charging, discharging, or environment, and over discharge, or improper charging are the primary reasons batteries lose capacity. Lithium polymer batteries will lose some of its initial capacity after a thousand or so charge-discharge cycles, but this is very much dependent on the charging rate used to charge the battery. If the charge rate is 0.5C or less, there is much less capacity loss (if any) over time. Charge rates of 1C and over, generate significant heat that deteriorates the cell chemistry over time, reducing capacity.
If I can ever kill my battery enough, I'll throw this phone on my charge profiler at work to see what charge rate it uses.
BTW, my two year old GSII is on its original battery and lasts all day with 40% left at the end of the day. I charge over night with no ill effects, but I never expose the phone to excessive heat.
T
Sent from my VS980 4G using Tapatalk 2
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You quoted my post to say that info on Wiki and Battery University is wrong? and giving an example of charging your SGS2 overnite with no ill effects to prove them wrong?
votinh said:
You quoted my post to say that info on Wiki and Battery University is wrong? and giving an example of charging your SGS2 overnite with no ill effects to prove them wrong?
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Like I said, I stopped reading the moment they stated the incorrect definition of current flow - if they got that basic tenant wrong, wasn't going to read further. Was not my intent to offend by quoting your post. My comment on the charging overnight was a general response to a prior post that leaving the device on the charger overnight was detrimental to the battery - probably should have quoted that post. In general, leaving an advanced device like a cellphone plugged into a charger will not overcharge a battery - a cheap toy will probably not have a proper charger and CAN damage a cell if left on for prolonged periods.
BTW, I'm an EE and design in Li-po batteries and chargers in my designs and I'm always dealing with non-technical marketing and sales folks to explain these types of details, so I tend to jump in when I hear wrong information (not saying the links contained false information) being discussed.
T
Sent from my Nexus 7 using Tapatalk 2
votinh said:
Here's my notes from a few years ago.
--------------------------------------------------------
Li-Ion Battery
(From Wiki) During discharge, lithium ions Li+ carry the current from the negative to the positive electrode, through the non-aqueous electrolyte
and separator diaphragm.[7]
During charging, an external electrical power source (the charging circuit) applies a higher voltage (but of the same polarity) than that
produced by the battery, forcing the current to pass in the reverse direction. The lithium ions then migrate from the positive to the
negative electrode, where they become embedded in the porous electrode material in a process known as intercalation.
Prolonging battery pack life (from wiki)
+ Avoid deep discharge and instead charge more often between uses, the smaller the depth of discharge, the longer the battery will last.
+ Avoid storing the battery in full discharged state.
+ Li-ion batteries should be kept cool; they may be stored in a refrigerator.
+ The rate of degradation of Li-ion batteries is strongly temperature-dependent; they degrade much faster if stored or used at higher temperatures.
+ Li-ion has no memory effect.
+ Li-ion does not need to be fully charged.
+ In fact, it is better NOT to fully charge, because high voltages stresses the battery.
+ Li-ion cannot absorb overcharge, and when fully charged the charge current must be cut off =>
+ To minimize stress, keep the lithium-ion battery at the 4.20V/cell peak voltage as short a time as possible. (meaning do NOT overcharge)
+ Some portable devices sit in a charge cradle in the on position. The current drawn through the device is called the parasitic load and
can distort the charge cycle. Battery manufacturers advise against parasitic load because it induces mini-cycles.
What does that mean to us? Don't use when it's plugged in?
+ A portable device must be turned off during charge. This allows the battery to reach the set threshold voltage unhindered, and enables terminating charge on low current.
+ Li-ion should never be discharged too low.
+ Do not recharge lithium-ion if a cell has stayed at or below 1.5V for more than a week.
Simple Guidelines for Charging Lithium-based Batteries (from batteryuniversity.com)
+ A portable device should be turned off while charging. This allows the battery to reach
the threshold voltage unhindered and reflects the correct saturation current responsible to
terminate the charge. A parasitic load confuses the charger.
+ Charge at a moderate temperature. Do not charge below freezing.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
+ Chargers use different methods for “ready” indication. The light signal may not always indicate a full charge.
+ Discontinue using charger and/or battery if the battery gets excessively warm.
+ Before prolonged storage, apply some charge to bring the pack to about half charge.
+ Over-discharged batteries can be “boosted” to life again. Discard pack if the voltage does not rise to a normal level within a minute while on boost.
Conclusion:
+ A portable device should be turned off while charging.
+ Avoid deep discharge and instead charge more often between uses.
+ Lithium-ion does not need to be fully charged; a partial charge is better.
Click to expand...
Click to collapse
Does this wall of text pertain to lithium polymer as well? Consdering that is the type of battery in the phone not ion
Sent from my LG-VS980