Related
I notice that there's a warning message when the phone is fully charged, advising you to disconnect the charger. I usually leave my phone charging every night, meaning that it's still connected to the charger for hours after it's fully charged. I'm pretty sure that the S2 has "smart" charging, but would the overnight charging damage the battery by exposing it to unnecessary heat for this extended period?
No it shouldn't. Like you said the phone has the ability to shut off the charge when the battery reaches 100%.
I've been charging mine all night for most nights out of the past 3-4 months and it's fine.
That warning is essentially Samsung's attempt to give you a green consciousness, since leaving the charger connected to the wall draws a trickle of current. Sammy figures that millions of people following those instructions to the letter will help save the planet.
It will reduce your batteries life, leaving it on the charger. Will it does stop charging it then drains to 99% then tops it up, which over time uses up the recharge cycles and will reduce the time until it can't hold a charge.
Lithium ion battery doesn't have recharge cycle.
jzmtl said:
Lithium ion battery doesn't have recharge cycle.
Click to expand...
Click to collapse
Exactly. This was true until Litium Ion batteries came the norm in handsets.
Nowadays its just to be seen as being 'green'
That is strange since this site devoted to teaching about batteries makes it seem like they do. But also reading it says that being at a constant full charge is more damaging then cycling the battery.
That is in the second paragraph under the "Depth of discharge" chart on this site
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
With the frequency cellphone batteries are charge/discharged, they crap out after two years anyway, and unlike some other fruity product it takes us 10 seconds to plop in a new one, so don't worry about it.
Even if it damaged your battery the effect wouldn't come noticeable before a long time I think. And in case the battery does get damaged, you can always replace it, that's one of the nice things about this phone, if you compare it for example to an iphone.
tomascunill said:
...And in case the battery does get damaged, you can always replace it, that's one of the nice things about this phone, if you compare it for example to an iphone.
Click to expand...
Click to collapse
exactly why i didn't buy an iphone
The only things really damaging your battery are:
- excessive heat
- heavy use while charging
- turning on the phone over and over after it turned itself off on it's own due to low battery
there are more, for sure, but just to name a few.
I always charge my phones over night and my HD2's battery is as good as ever after 2 years. My SGS2's battery is still the same, and I still thing that when the battery is full there are no discharge/recharge cycles but something like a suspend mode in the charger.
Okay so I've this problem where my battery discharges while charging!
I had this problem since wednesday that time I was on stock... So I thought flashing a custom ROM now as of now i'm on SonyStyle still the same problem,
let me elaborate my problem a bit more
-To monitor how much current is discharging n charging! -498 mA while discharging n -298 mA while charging it normally
-So next thing I tried is to charge it while being switched off, most of the times it wont charge n when it'll charge it'll reach some point n starts discharging! Discharging even when its off and plugged to the charger! BIZZARE isnt it?
-Now in order to put it on chrging i've to reboot it couple of times untill battery monitor widget shows +current... N when it reaches 100 it'll begin to discharge like it'll be empty in 1nhalf hour
-ALSO I'VE TURNED OFF ANYTHING THAT SUCKS BATTERY! AND I'M NOT USING MY DEVICE WHILE CHARGING! ALSO IT DISCHARGES WHILE BEING ON CHARGER IN A switched off state.
these things i've already tried
-Flashing custom ROM
-Putting my cell on powersave CPU governor
-undervolting
-charging using USB
-CUSTOMER CARE CENTRE only resets the software
I'M SO FRUSTRATED THAT I'LL BURN THIS CELL INTO ASHES! Anybody help me before I kill thislil fellow!
You might try resetting your battery stats on clockworkmod or xrecovery. Charge until 100% and let it discharge naturally to switch off, allow a few days of charge cycling and it should be ok.
Lipoly batteries dont trickle charge. If you leave your phone on charge for 8 hours it will just switch off the charger, discharge for awhile and then switch back on the charger. Most take 1 to 1.5 hours to charge, so if you leave it plugged in you will be charging/discharging about 6 times in that period. Lipoly have a limited number of charges before they diminish, usually about 500. So if you leave it plugged in you can reduce your battery life span considerably - otherwise it should last a good year and a half before it wears out.
Dont ever try to trickle charge, overcharge or manually discharge a lipoly battery as they have a tendancy to explode.
The good news is lipoly batteries are cheap to manufacture. You should be able to pick up a decent bst-38 (or substitute) on ebay/amazon for around 15-20 euros. Dont be hoodwinked into the 2000mAh batteries, most are fake. My 970mAh can last 2 days on Gintonic rom.
Sent from my U20i using Tapatalk
I had a similar problem with the battery discharging whilst charging.
For me the problem turned out to be my USB cable becoming faulty. It would still transfer data when connected to a computer, but would get a similar problem to the one you describe when charging. Might not be the same problem for you though.
I am now experiencing this problem. I think it is my usb cable too. Will buy another 1 soon. It discharges then charges again when I pull out the cable and plug it in again.
Sent from my U20i using xda premium
Well already tried wiping battery stats
heres what I've discovered till now
-The charge current drops as if the battery is at 91% but it isnt even close
-It is either the battery is sending wrong data to charger, or it is faulty
-Not able to explain how n why it discharges even a switched off state???
-Only solution I can think is a charging dock for BST-38
obsidian_eclipse said:
You might try resetting your battery stats on clockworkmod or xrecovery. Charge until 100% and let it discharge naturally to switch off, allow a few days of charge cycling and it should be ok.
Lipoly batteries dont trickle charge. If you leave your phone on charge for 8 hours it will just switch off the charger, discharge for awhile and then switch back on the charger. Most take 1 to 1.5 hours to charge, so if you leave it plugged in you will be charging/discharging about 6 times in that period. Lipoly have a limited number of charges before they diminish, usually about 500. So if you leave it plugged in you can reduce your battery life span considerably - otherwise it should last a good year and a half before it wears out.
Dont ever try to trickle charge, overcharge or manually discharge a lipoly battery as they have a tendancy to explode.
The good news is lipoly batteries are cheap to manufacture. You should be able to pick up a decent bst-38 (or substitute) on ebay/amazon for around 15-20 euros. Dont be hoodwinked into the 2000mAh batteries, most are fake. My 970mAh can last 2 days on Gintonic rom.
Sent from my U20i using Tapatalk
Click to expand...
Click to collapse
If I leave my cell on charging for 8 hours, then after 8 hours my battery will be zero... It'll keep blinking the red light for hour or more... See thats a wicked problem...
happened to me also, had to use a better cable (don't use thin and/or long cables)
Yeah I tried with a Nokia made cable and its charging flawlessly! This is my first time with a Non-Nokia n so far the experience is not very good!
btw thanxxx a lot for your attention n concern!
- similar (identical) problem, tried similar resolutions (factory reset/sdcard/sim removing/different chargers/battery replacement)
- disassemble my phone... and found out, that micro usb connector replacement is unrealistic.
- watched charge/discharge/voltage/current/temperature process trough battery monitor widget (1 minute sampling)..
- re-calibrated battery many times
RESOLUTION : micro usb connector or connections in mobo is dead. I build charger with current meter. No matter, what says my phone about charging (pluged in - discharging)- any information displayed delays for minutes on phone. IF my external current meter says - "charging", than phone state is "CHARGING" independent from what phone is displaying at the moment. Moving usb charging connector in phone causes current to stop flying to phone or reducing current value. Phone still says "plugged in" and or "charging" on "discharging"...
Temporary resolution: little pushing/deformation on charging connector (male) and LED in charging chain, witch is displaying - charging or not. Every time connecting charger i'm looking on indicator LED and moving charge connector, till LED says "charging" and then no more any moves on phone.
Future resolution: contact-less charging trough inductive coupling
Got my second Prime, after having to send back the first one. But this time the charger was defective. I have been able to charge it a bit by using the USB on the PC, so-called trickle charge, but I did not charge it properly before first time use (the eight hours recommended). The tablet was slightly used, slightly charged, slightly used and charged to exactly 100% through computer's USB. The dock won't trickle charge at all and has now 0% power.
I can send in the charger back and receive a new, but this will take one to two weeks. So I won't be able to charge the dock at all in a couple of weeks and it will be stored with 0 % battery power. The tablet would have to do with the trickle charge.
I then wonder how damaging this could be the battery? I do not want to take any chances and end up with a crappy battery after a year or two. I have read a lot on the internet, but people are very inconsistent about whether a Li-ion battery will be damaged without proper first time charging or not, and lying around for a couple of weeks with zero battery power.
Thanks in advance!
LightlyX said:
Got my second Prime, after having to send back the first one. But this time the charger was defective. I have been able to charge it a bit by using the USB on the PC, so-called trickle charge, but I did not charge it properly before first time use (the eight hours recommended). The tablet was slightly used, slightly charged, slightly used and charged to exactly 100% through computer's USB. The dock won't trickle charge at all and has now 0% power.
I can send in the charger back and receive a new, but this will take one to two weeks. So I won't be able to charge the dock at all in a couple of weeks and it will be stored with 0 % battery power. The tablet would have to do with the trickle charge.
I then wonder how damaging this could be the battery? I do not want to take any chances and end up with a crappy battery after a year or two. I have read a lot on the internet, but people are very inconsistent about whether a Li-ion battery will be damaged without proper first time charging or not, and lying around for a couple of weeks with zero battery power.
Thanks in advance!
Click to expand...
Click to collapse
Before sending the charger in try putting in a plastic bag and place it in the freezer for about 20 minutes. Get as much air out of the bag as possible. It could be the chargers safety has been tripped and its stuck.
they recommended the battery be fully charged up when first recieced. they say 8hrs. but that's way too long. only takes about 2 hrs. for battery to fully charge through its power plug. once fully charged battery will need To go through a few complete cycles(from 100% to 0% or close) before the battery is properly calibrated and optimized.
I wouldn't think trickle charging the prime will hurt anything as long as you still going through cycles. if you only can trickle charge right now, might be best not to let prime go completely dead. just charge once its low or whenever not in use. how long did it take to charge battery completely up through trickle charge?
As far as I know trickle charge is even better for Lithium batteries, and provides longer battery times and less wear-and-tear on the battery.
Tried the freezer. It would charge for a couple of minutes, then stop again. But it gets pretty hot, so I would thinks it's overheating.
Don't know how long the trickle charge takes. I charged it for maybe four hours from 60 %, but don't know when the charge was complete.
And as I said, I used the prime for a bit, turning it on and off, tryinging to get the charging to work. I first charged it completely after 2 days. And the dock got dischared at once since connected it to the tablet at once, and left it for 8 hours because I thought it was charging. Haven't been able to charge the dock since...
Trickle charging is actually better for your devices than charging with a rapid charger. It both prolongs the overall life of the battery and can lead to "deeper" charging where the batter actually ends up with a slightly higher stored charge which would give you slightly longer battery life.
As for the charger, if you live near an OfficeDepot they might have some in-store so you can pick up a replacement for around $30. You can also get them online from the OfficeDepot website: http://www.officedepot.com/a/products/768723/ASUS-Power-Adapter-For-Eee-Pad/
Even if you get your charger back from RMA, it is good to have a spare charger lying around!
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
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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?
Click to expand...
Click to collapse
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
hi guys, just wanted to share a very handy device i have come across that i really like. I have an extra battery and cradle, however i dont trust the charging capabilities of the cradle once it reaches full charge. I know the device itself will slow down and trickle charge once it reaches full capacity, but in the cradle im afraid of overcharging the battery. anyhow, i began looking for a timing device to prevent this. I came across this item
http://www.amazon.com/Belkin-Conser...=1421085461&sr=1-1&keywords=belkin+timer+plug
it has a half hour setting, a 3 hour setting, or a 6 hour setting. i began to find myself using this, not only for the cradle, but when i go to bed at night. i connect it to my phone. 3 hour charge, then it shuts off. im surprised these arent more prevalent. in fact, belkin was the only one i could find, (short of those xmas light dial timers lol). let me know what you think
I've been using the cradle and extra battery for a while now. No issues. I swap it out daily(well until I got my PMA sticker)
Even before then, I noticed no issue with poor battery performance or life.
Here's some helpful info from Battery University website:
Simple Guidelines for Charging Lithium-based Batteries
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.
Go here for more detailed info: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries