Not sure if this is dangerous or not... and really don't see how this is even possible. Charges at the full 9V/2A on my Pixel XL OEM charger.
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The power supply would not be anywhere near 100% efficient, so what it is taking AC is going to be close to double what it is giving to the phone.
Sent from my SM-G935F using Tapatalk
use those usb 3v-20v power meters, about $10 on ebay, it will give you a more accurate usb power output reading.
https://www.aliexpress.com/item/201...er-For-Cell-Phone-Power-Bank/32623928144.html
tonymy01 said:
The power supply would not be anywhere near 100% efficient, so what it is taking AC is going to be close to double what it is giving to the phone.
Sent from my SM-G935F using Tapatalk
Click to expand...
Click to collapse
Yes, it actually is near 100% efficient. You're saying it's only about 50% efficient which is an absurd unsupported statement. My Pixel XL reads 18W~ just like this when it charges from 0% - does that mean it's not charging at 9V/2A? No, it's definitely charging at 9V/2A.
sonhy said:
use those usb 3v-20v power meters, about $10 on ebay, it will give you a more accurate usb power output reading.
https://www.aliexpress.com/item/201...er-For-Cell-Phone-Power-Bank/32623928144.html
Click to expand...
Click to collapse
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
Absurd? I did some quick googling to try to find the efficiency of a switch mode supply, it definitely isn't 100% so I decided to make it easy for the o.p. and give a 50% example.
Sent from my SM-G935F using Tapatalk
Nitemare3219 said:
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
Click to expand...
Click to collapse
not sure what device you speak of, but I'm talking about wattage energy monitors and all my watt meters work with me note 7 as they should... qc just means higher voltage and current, nothing fancy, and so it does show 9v @1.8A or so which is what its meant to do anyways.
Cmon people use some common sense.
The battery has a nominal voltage of around 4.4v fully charged. It has a capacity of 3500mAh.
These means a charge current of 3.5A is a charge rate of 1C which is fine. Even a charge rate of 7A would only be 2C.
As for the 9v, I GURANTEE there are some losses. It would have to convert 9v to 3-4.4ishV depending on charge current.
Let's say the battery is low and it's charging @ 3.5v or so as first part of the typical CC / CV charge cycle.
This means a constant current of X with a variable voltage which early on might only be let's say 3.5v on the voltage curve early on.
Watts = Voltage(Current)
18 = 3.5X
X= 18/3.5
X=5.14
So 5.14 Amps @ 3.5v would be going into the battery during this early on fast charge.
With a capacity of a whopping 3.5Ah, a charge current of 5.14Ah means a charge rating of 1.47C
Now remember, there are some losses from the conversion too.
So under 1.47 (probably under 1.3-1.4 with energy losses) C rating seems normal.
Personally, I wouldn't exceed 1C which is why I disable fast charge.
---------- Post added at 02:20 PM ---------- Previous post was at 02:18 PM ----------
Nitemare3219 said:
Yes, it actually is near 100% efficient. You're saying it's only about 50% efficient which is an absurd unsupported statement. My Pixel XL reads 18W~ just like this when it charges from 0% - does that mean it's not charging at 9V/2A? No, it's definitely charging at 9V/2A.
Except they don't hardly work worth a damn. Almost none of them work with QuickCharge, and none of them work with type C or power delivery.
Click to expand...
Click to collapse
Please read my post above. It is NOT charging at 9V. Feeding 9V into a lithium battery would make it explode.
It is being converted using some DC-DC converter so the battery gets fed around 3.something to 4.4v during the CC/CV charge curve.
tonymy01 said:
Absurd? I did some quick googling to try to find the efficiency of a switch mode supply, it definitely isn't 100% so I decided to make it easy for the o.p. and give a 50% example.
Sent from my SM-G935F using Tapatalk
Click to expand...
Click to collapse
It's probably about 95% efficient actually, which is pretty close to 100% in my book.
There's inefficiency in the battery however, since the phone gets warm when charging, right? And warm = energy being dissipated as heat. i.e. you have to put more than 3500 mAh in, in order to fully charge a 3500 mAh battery.
Related
I had the skyrocket originally but didn't like the lack of custom ROM and not to mention I don't really care about LTE. SO i've been thinking about getting the Samsung galaxy S II since I loved the skyrocket. One thing I did experience with the skyrocket and everything I've been able to research up to this point also indicates the same on the galaxy S II. It takes nearly 3-4 hours to fully charge the phone. Is there any way with custom rom or Kernel or any other tweaks to make this faster? I understand increasing the current to the battery does make it degrade faster, and quite honestly I don't really care. If the battery lasts me 1 year I'm happy with it as the batterys are inexpensive and easily changeable.
its internally controlled by the chip and cannot be changed. period.
Unfortunately, unlike the original GalaxyS series, our device has a fixed charger that only charges at 400 mA (USB) or 650 mA (regular charger). There appears to be no way to change these current limits.
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Entropy512 said:
Unfortunately, unlike the original GalaxyS series, our device has a fixed charger that only charges at 400 mA (USB) or 650 mA (regular charger). There appears to be no way to change these current limits.
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Click to expand...
Click to collapse
SO YOU'RE TELLING ME THERE'S A CHANCE!!
Been awhile since I've seen dumb and dumber
Sent from my páhhōniē
Entropy512 said:
There's a slight chance I might find a way to make the MAX8997 handle charging instead of the MAX8922, but I'd estimate the chances of this happening at <5%.
Click to expand...
Click to collapse
well, thats about 100% better than my chances of doing it But on a serious note, I heard that the faster you charge the less your battery life would have. is that correct? I thought I read that slower charging is better for the battery.
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You can try and change the values using voltage control, but not sure if it will actually lower the charging time.
Sent from my GT-I9100 using XDA App
that isnt an option on my phone.
nyydynasty said:
well, thats about 100% better than my chances of doing it But on a serious note, I heard that the faster you charge the less your battery life would have. is that correct? I thought I read that slower charging is better for the battery.
Click to expand...
Click to collapse
True - There are two ways you can use "life" to describe a battery:
1) Capacity for a given charge
2) Number of charge/discharge cycles before 1) gets reduced - Charging a device faster and "bump charging" that last little bit of juice in at the end is bad for this
On the Infuse I had a custom algorithm that was intended to provide improved charge rates for deeply discharged devices, but not stress the battery TOO much - The algorithm dropped current early as voltage increased, and also cut off charging earlier. So it took longer for the last phase of charging, but could charge a deeply discharged battery much faster.
cfaberlle said:
You can try and change the values using voltage control, but not sure if it will actually lower the charging time.
Sent from my GT-I9100 using XDA App
Click to expand...
Click to collapse
Siyah removed those features in later versions after this video:
http://www.youtube.com/watch?v=FL71G2YEIHU
I use my HP Touchpads charger and it seems to charge pretty quickly, though I never timed it. CurrentWidget says its charging at around 1800mA.
*sigh*
Someone didn't read the first post of the thread for the kernel they're using in its entirety...
You are not charging at 1800 mA.
I did not....:x good to know though, my bad!
why doesn't the battery charge while it is plugged in while I'm watching a movie or talking to somebody online it's ridiculous amber light never turned green only when it sitting idle
Sent from my ADR6425LVW using xda premium
Most likely because what you're doing, especially the movies is drawing more power than what's actually being pumped into the battery. Get battery monitor widget by "3c" in the market. Very very detailed info about your battery. Ish you never even thought about/existed. Haha. Its very helpful.
Sent from my Re-ZiZzLe Using Unreleased Ish =)
How is it being charged? USB or AC... The answer is important, as USB only charges half as fast as AC.
Regardless, the reason is that if you are using the phone heavily, you are using a lot of power. If you are using a lot of power, you may be using all or almost all of the power coming from the charger just to operate the phone.
I have seen power use rates when using the phone heavily that are around 700mA, that is more than the 500mA that you get when charging via USB, and almost as much as the 1000mA that AC provides.
Heck, I have seen power use rates that are up to 1100mA a few times. That is higher than even the AC input.
Here is a screen shot of my charging over the last 12 days. I have NEVER gotten 1k+ (results may vary. As to why, stated in the following) you can see on the bottom screen the max mA peeked at 972. USB doesn't charge at "half" the mA as wall chargers. I thought that too, but did some tests (while VERY bored at work. Haha) and have seen 600 to around 800 mA. It varies on a number of things.
Ie: the USB cord itself. As some are designed for data only or faster transfer rates rather that charging taking priority. (charging light may be on, but thats just because it knows somethings plugged in. Or you could just have a Bonk one. They're are MANY different USB cables today.
The phones kernel, because you'll notice when the phone is damn near dead, USB or wall, will charge at a higher mA and fluctuate at different battery percentages.
A good/stock kernel will charge super fast when battery is very low to get you somewhat charged quickly. Then in the upper percentages it should slow way down especially in the high 90%'s to effectively complete/finish out the charge rather than just throwing rediculous power into the battery across the whole process. Also what other stuff you may have turned on, on the phone like "enable always on mobile data" may be detrimental. Hope this helps man.
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MikMik Fam
dopediculous said:
Here is a screen shot of my charging over the last 12 days. I have NEVER gotten 1k+ (results may vary. As to why, stated in the following) you can see on the bottom screen the max mA peeked at 972. USB doesn't charge at "half" the mA as wall chargers. I thought that too, but did some tests (while VERY bored at work. Haha) and have seen 600 to around 800 mA. It varies on a number of things.
Ie: the USB cord itself. As some are designed for data only or faster transfer rates rather that charging taking priority. (charging light may be on, but thats just because it knows somethings plugged in. Or you could just have a Bonk one. They're are MANY different USB cables today.
The phones kernel, because you'll notice when the phone is damn near dead, USB or wall, will charge at a higher mA and fluctuate at different battery percentages.
A good/stock kernel will charge super fast when battery is very low to get you somewhat charged quickly. Then in the upper percentages it should slow way down especially in the high 90%'s to effectively complete/finish out the charge rather than just throwing rediculous power into the battery across the whole process. Also what other stuff you may have turned on, on the phone like "enable always on mobile data" may be detrimental. Hope this helps man. View attachment 895606
Sent from my Re-ZiZzLe Using Unreleased Ish =)
MikMik Fam
Click to expand...
Click to collapse
It was only a few times I noticed the power use that high.
USB can vary, but general rule is 500mA can be counted on as that is the max that the standard provides.
All charge rates will vary. The main problem is the fact that we usually charge a device that is powered on. The varied power use will cause fluctuations in charge rate.
I need to research more into how Li-Ion charges when the device is still in use. I do know how they charge when not in use, and all the little details of it. The biggest problem is that powered on really messes with how a Li-Ion battery can charge.
I need to get out my stand alone computerized Li-Ion battery charger and do some testing. I have been wondering exactly how much these batteries hold if actually charged properly. Too bad that the Stock OEM batteries are 3.8v nominal, they charge to a higher overall voltage and my charger is not set up to handle the new voltage so I couldn't charge the stock to a real 100%.
if u charge by AC with a 1000 mA you should be fine
Are you watching the movie on your phone or do you have it connected to a TV? The screen being on will draw a lot of power I believe.
Always always wall charged; only used USB to adb stuff never let it charge via usb
Sent from my ADR6425LVW using xda premium
If you're charging by USB, forget it.
Sent from my ADR6425LVW
I read few topics similar like this on other web sites, but i need more opinions from you guys. I have 3vo GSM for few days and i am afraid of charging the batery. Why? Because it is going up to 4350mv or 4.35V, and as i know it's too much (it's normal up to 4.1 or 4.2) and with that kind of charge you can reduce battery life. So i need to know is that rom related, kernel related or it's something wrong. I am rooted on MikRunny v1.11 and don't know is that happaning on stock phone. I don't know what is wrong, but i don't like this kind of charging.
It's normal.
majid25 said:
It's normal.
Click to expand...
Click to collapse
It's definetly not normal. It's hurting battery.
Wikipedia:
High charge levels and elevated temperatures (whether from charging or ambient air) hasten capacity loss. Loss rates vary by temperature: 6% loss at 0 °C (32 °F), 20% at 25 °C (77 °F), and 35% at 40 °C (104 °F).
(Many) Lithium-ion battery packs contain fail-safe circuitry that shuts down the battery when its voltage is outside the safe range of 3–4.2 V per cell. ....3.7 V nominal voltage with a 4.2 V max charge.
Typically, lithium-ion cells are charged with 4.2 ± 0.05 V/cell.
Is there something that can fix this????
4350mv is totally normal for our phones.
It's perfectly normal, stop being paranoid. It's just a phone.
Sent from my PG86100 using Tapatalk
Thanks for reply. My phone is charging from 99% to 100% in 45 minutes. Is that normal too??
Sent from my HTC EVO 3D X515m using XDA
kire.htc said:
Thanks for reply. My phone is charging from 99% to 100% in 45 minutes. Is that normal too??
Sent from my HTC EVO 3D X515m using XDA
Click to expand...
Click to collapse
No, that's a lie
Sent from my PG86100 using Tapatalk
bloodrain954 said:
No, that's a lie
Sent from my PG86100 using Tapatalk
Click to expand...
Click to collapse
Lol.
Trust me there are fail safes. Your phone will not blow up and your battery will no spontaneously com bust. Quit being paranoid...
bloodrain954 said:
It's perfectly normal, stop being paranoid. It's just a phone.
Sent from my PG86100 using Tapatalk
Click to expand...
Click to collapse
Just a phone? It's also got a highly volatile battery in it if you charge it incorrectly.
When people say "it's normal", you need to clarity whether normal = phone misreads charge voltage, or if normal = normal to charge at 4.35v. If it's "normal to charge at 4.35v" then that's a real big problem with your phone.
Li-ion is not to be ******* with. Please don't go telling people it's OK when it's not.
[This has been a public service announcement] lol ;-)
Sorry if the tone is harsh, but please go and read some articles on li-ion charging people
meme405 said:
Lol.
Trust me there are fail safes. Your phone will not blow up and your battery will no spontaneously com bust. Quit being paranoid...
Click to expand...
Click to collapse
So at what point are you going to mention one of the fail-safe's being that it vents to atmosphere when the battery pressure get's too high? (possibly with flame).
Overcharging li-ion battery is very dangerous. I did some research and this is what i found:
I fully charged my battery. On battery monitor widget it shows 4349mV. I turn off the phone, take off batery and measure with digital multimetar. It shows 4.31mV. So maybe the phone does't show very accurate stats. I'am still not sure.
This is what i found on web:
A source reached out to us and let us know that the Motorola Bionic's 3.8 V battery is in fact using a new alternative high voltage chemistry, and is not simply an overcharged Lithium Ion battery. This same battery will be used in the just-announced Motorola Atrix 2 as well. Note that the battery name includes an H (eg HW4X) to denote the use of these high voltage battery chemistries. This new chemistry also has similar cycle life as existing 3.7 V nominal batteries, and has been in the works for several years.
It’s just interesting that this particular battery is 3.8 V nominal (4.3 V fully charged), as this 0.1V boost design choice gives the battery a bit more capacity. It isn’t a huge difference, 3.7 V would make the 1735 mAh battery 6.4 Whr, the 3.8 V of this current design makes it 6.6 Whr.
SOURCE: http://www.anandtech.com/show/4910/motorola-droid-bionic-review-dual-core-with-4g-lte/2
This will be useful too:
http://forum.xda-developers.com/showthread.php?t=871051
So i hope that this will help someone.
bloodrain954 said:
No, that's a lie
Click to expand...
Click to collapse
ORLY? I've noticed on several different chargers that my Amaze is moderating the charging rate (and amperage, if you believe Battery Monitor Widget) as it nears 100%. I get "Battery Full" and "Charging complete" alarms well after "100%" is reached.
Both images are from overnight charge cycles, with screen turned off. Autosync and other periodic processes are disabled at night by Llama. Vertical indices represent one hour. Second image is for an HTC stock charger, U250.
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I've had this N9 LTE for about a week and a half, so i'm still not used to it fully, but this, this can't be normal right? I havn't seen a device take 10 hours to recharge 75% since the first iPhone in 2007. Plus I have ElementalX Kernal with fast recharge enabled...I don't get it
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find a good cable and a good 1.5A-2A charger, the junk HTC gave us is something out of their "just include something" bin. I haven't even taken the stock charger out of its packaging. its good in a pinch when you must have a charge, but not worth using on a higher power device like the N9.
also, give a kernel like elementalX a try, it should enable faster charging..
anker makes some good self regulated (based on needs) multi port chargers, give those a try with some anker 1' cables.
Sent from my Nexus 9 using Tapatalk
Stock charger works fine here. Takes 6 hours or so to charge.
Verstuurd vanaf mijn HIGHWAY SIGNS met Tapatalk
Migamix said:
find a good cable and a good 1.5A-2A charger, the junk HTC gave us is something out of their "just include something" bin. I haven't even taken the stock charger out of its packaging. its good in a pinch when you must have a charge, but not worth using on a higher power device like the N9.
also, give a kernel like elementalX a try, it should enable faster charging..
anker makes some good self regulated (based on needs) multi port chargers, give those a try with some anker 1' cables.
Sent from my Nexus 9 using Tapatalk
Click to expand...
Click to collapse
I'm using my note 4 fast charger and cable. Can't be better quality than that. And as mentioned, I'm already on ElementalX
After you change the cable you might realize that this won't solve the problem. Most of the times it works better if you simply reboot the tablet, the charging time will significantly decrease (~3-4 h depending on your kernel). Share if something changes.
polish_pat said:
I'm using my note 4 fast charger and cable. Can't be better quality than that. And as mentioned, I'm already on ElementalX
Click to expand...
Click to collapse
You didn't mention if you have a custom rom? I'm using a cm based rom and there is a known bug that the tablet does not show the correct battery status... I have to reboot it to see the true batters stats
cables2590 said:
You didn't mention if you have a custom rom? I'm using a cm based rom and there is a known bug that the tablet does not show the correct battery status... I have to reboot it to see the true batters stats
Click to expand...
Click to collapse
Stock android, ElementalX Kernel
polish_pat said:
Stock android, ElementalX Kernel
Click to expand...
Click to collapse
Yeah that's not normal... I would now try the stock charger... That's what I use and it works fine... If that doesn't help then I'll would call Google for a replacement
I'll wait for 5.1 to come out and will take a decision then. Thanks for your input
it's not normal for this to happen, but i've seen a few threads where this does happen and it doesn't matter the kernel, charger or cables. sometime the device gets stuck at charging at less than usb 2.0 speeds. it doesn't happen all the time, but it's pretty crappy when it does happen. one suggestion was to unplug and replug each time you charge it to hopefully not get stuck with the bug through that charge session. when i do catch it trickle charging i just replug it. i generally charge in just over 4hrs for a full charge using a samsung note charger and cable.
I have been using the stock charger with a third-party USB cable (I needed something longer) and it has never taken more than 3-4 hours for a full charge.
Try using Ampere app from the play store to test different chargers and cable combinations. It helped me to eventually go with a iPad charger and a 20awg 1m cable which charges at an average of 1700mha which means a full charge of about 3hrs or less (stock ROM + ElementalX fast charge enabled)
Sent from my Nexus 5 using Tapatalk
Not sure if this is the same issue, but when I charge my n9 overnight, the battery indicator only shows like 23% charge. However, if I restart the n9 it updates and shows 100%.
Anyone have that issue? Buy
I think my Nexus 9 charges faster with the Fire-Ice Kernel
Hello I made this thread so people could post their charging mA with the fast charge, Im getting around 960-1010 mA charge while my phone is plugged... I think my result is kinda low for a fast charge charger, I used my Galaxy Tab S charger on my Nexus 5 and I could get up to 1400 mA! And thats with the "old" snapdragon 800 quick charge, also, it charges much faster than my S6 with only 300 or 400 mAh less capacity than the S6...
What is your current charge mA? You can use Ampere or type current charge in the play store to see how fast your phone charges! Compare with others and see if theres something wrong with your charger or battery.
Sorry about my english I learned it through MMOs.
Here is a picture of my current charge!
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Hello
I also use Ampere and with the fast charger it shows about 2700mA charge, but I heard somewhere that the fast charging only works when the screen is off, so you might possibly be getting a lower charge because you are using the phone while charging it, when using the fast charge I don't use my phone at all. You might ask them how am I able to even see the charge if I don't even use my phone? I turne the notification settings on the pro version of ampere so it shows the charge on my lockscreen always
Skhulile said:
Hello
I also use Ampere and with the fast charger it shows about 2700mA charge, but I heard somewhere that the fast charging only works when the screen is off, so you might possibly be getting a lower charge because you are using the phone while charging it, when using the fast charge I don't use my phone at all. You might ask them how am I able to even see the charge if I don't even use my phone? I turne the notification settings on the pro version of ampere so it shows the charge on my lockscreen always
Click to expand...
Click to collapse
Whats your current charge with screen on? And why is my nexus getting up to 1400 mA when my screen is on when fast charge is supposed to be much faster than the snapdragon 800 quick charge.
Edit: my phone says itll take 31mins to charge from 82% to 100% with fast charge, is that normal?
Sent from my SM-G925I using Tapatalk
PunkOz said:
Whats your current charge with screen on? And why is my nexus getting up to 1400 mA when my screen is on when fast charge is supposed to be much faster than the snapdragon 800 quick charge.
Edit: my phone says itll take 31mins to charge from 82% to 100% with fast charge, is that normal?
Sent from my SM-G925I using Tapatalk
Click to expand...
Click to collapse
Uhm I'll first have to test that, and about the lower charge from 82 to 100, it is normal because with the Adaptive Fast Charging you get a high charge initially and towards the end it lowers, that is how it's supposed to work in order to charge the battery properly
Skhulile said:
Uhm I'll first have to test that, and about the lower charge from 82 to 100, it is normal because with the Adaptive Fast Charging you get a high charge initially and towards the end it lowers, that is how it's supposed to work in order to charge the battery properly
Click to expand...
Click to collapse
Aight let me know about your charge mA when the screen is on with ampere!
Sent from my SM-G925I using Tapatalk
PunkOz said:
Aight let me know about your charge mA when the screen is on with ampere!
Sent from my SM-G925I using Tapatalk
Click to expand...
Click to collapse
Okay I tested today and I got 1020mA with the fast charger while using the phone.
it is normal because with the Adaptive Fast Charging you get a high charge initially and towards the end it lowers
If you can charge from 0 to 50% in about 30 minutes. Then it is working fine. It charges much slower after that percentage to protect the battery and etc. It's normal for all fast charging capable phones.
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Guys I stopped fast charging after reading that it possibly fries the accelerometer.. I haven't charged by phone with the adaptiv fast charger yet. Use a 5v/6amp charger which is quite slow. Please advise me if I can start using the fast charger without causing issues to accelerometer thanks
Moto g5 plus
I get around 900mah to 1200mah.
I have Moto g5 plus having Quick charge 2.0
Yeah, I can confirm that fast charge only works while the screen is off. The voltage the charger spits out reflects that.
Screen off: 9V
Screen on: 5V
PunkOz said:
Hello I made this thread so people could post their charging mA with the fast charge, Im getting around 960-1010 mA charge while my phone is plugged... I think my result is kinda low for a fast charge charger, I used my Galaxy Tab S charger on my Nexus 5 and I could get up to 1400 mA! And thats with the "old" snapdragon 800 quick charge, also, it charges much faster than my S6 with only 300 or 400 mAh less capacity than the S6...
What is your current charge mA? You can use Ampere or type current charge in the play store to see how fast your phone charges! Compare with others and see if theres something wrong with your charger or battery.
Sorry about my english I learned it through MMOs.
Here is a picture of my current charge!
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