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[Q] Am I Damaging My Battery?

I go out at night mostly so by the time i leave the house my phones battery is about 75% full. I have the LG G2x. My question is sometimes before i leave i'll see that it's 75% full so i'll charge it back to 100% before i leave. Does charging the phone without it being drained damage the battery? should i just leave it alone next time i go out? sorry if this is already a thread just point me in the right direction.
Thanks.

You're not damaging your battery But if you never drain the battery completely, i'm not sure how good the battery will be after 6 month, so i recommend you drain it completely every couple of weeks.
Sent from my HTC Desire HD using XDA Premium App

There are several opinions about keeping battery health for more time. Recharging at 75% is not one of them, but it's not the worth of it.
Here's what i know and what i've heard:
* some manufacturers (laptops) have software that don't allow the battery to charge when it's over 80 to 90% - they say it helps on battery life
* it's common sense that you should recharge when you have 20 - 40% and do a full cycle once in a while (this is what i do)
In my opinion, charging only 25% of the charge in a regular basis will not really help to keep battery life...

I've personally had the best performance from batteries when I let them discharge as much as possible and then charge them to full without interruption.

some have also said that draining the battery too often can also damage it, is this correct?

They like to be ran down then recharged but not all the way down to nothing unless you are having a problem with bat life on a rom

groe886 said:
some have also said that draining the battery too often can also damage it, is this correct?
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Yes. You should not drain your battery all the time. Use normally, charge it when below 40% and yes, charge it back to full - that's the ideal thing.

l4g4rt0 said:
Yes. You should not drain your battery all the time. Use normally, charge it when below 40% and yes, charge it back to full - that's the ideal thing.
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+1 that is the best way. Li-on batteries should'n be drained completly because it can shorten their life.

I read somewhere that it is not important when you start charging your battery (20%, 60%...) but it's important that it finishes to charge up to 100% every time

I heard/read that LI-ION batter is good to charge when cap goes bellow 30%.

[Q] The best way to calibrate a new akku?

Hello Guys, i bought a new mugen akku and dunno what´s the best way to calibrate it.
There are a few things that are confusing me:
1.Mugen Instructions: "Never drain battery to 0%"
(but that´s required for calibration, isn´t it?)
2.the battery got its full power after a few charges/discharges
(so would it be better to wait to calibrate the akku when it got its full power?)
So finally, should i wait with calibration or do it at the beginning? I think one time is necessary to let it go down to 0%.
So what are your advice?
thx in advance, l-viz

The way I calibrate mine is to discharge it completely so it turns off by itself (normally happens around 1 or 2%) then plug it into the charger and let it charge completely to 100%. Note that the LED will turn green at 90% .. so its not done yet!
Just my 2 coppers...
Sent from my T-Mobile G2 using xda premium

You are just calibrating the battery meter on the phone, not the battery. People constantly abuse the terminology.
You don't need to drain the battery to zero, because the battery meter is not even remotely that accurate in the best of circumstances. Draining to 10 or even 20% is no different than draining to zero.
What CAN happen if you drain to zero, is you you may trip the safety circuit on the battery, and render the battery unable to take a charge, thereby rendering it useless. Its not very likely, and safeguards on the phone are designed to prevent this, but plenty of people on here have had it happen. Full power cycles (draining to zero) also shortens the long term life of the battery. Especially considering there is NO value added to draining the battery to zero, there is no point it doing so intentionally, and taking an unnecessary risk.
Just charge your battery to 100%, let it sit on the charger for a while after full, to make sure its really topped off. Then use the phone until 10-20%. Repeat this a couple times. You can also go into recovery and clear battery stats before you charge/discharge. But I haven't noticed this to make much of a difference.

redpoint73 said:
What CAN happen if you drain to zero, is you you may trip the safety circuit on the battery, and render the battery unable to take a charge, thereby rendering it useless. Its not very likely, and safeguards on the phone are designed to prevent this, but plenty of people on here have had it happen. Full power cycles (draining to zero) also shortens the long term life of the battery. Especially considering there is NO value added to draining the battery to zero, there is no point it doing so intentionally, and taking an unnecessary risk.
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Wow. I didn't know that. Thanks!
Sent from my T-Mobile G2 using xda premium

Draining the battery to a literal 0% is almost impossible. Lithium ion batteries do not allow devices to utilize all the juice in a the battery. Once a device shuts off and tell you the battery is "dead", there's actually a bit more juice that is only used by the battery to prevent the battery's level from becoming too low.
Think of it like space partitions in hard drives. While you can use 100% of a single partition in a hard drive. There will still be space left over in the other partition.
Now what mugen means is to not allow the battery to reach the 0% of the ENTIRE battery. In order to make that happen you would have to discharge the battery until your device doesn't turn on and then NOT charge the battery for a very long period of time. I'm talking weeks and months of no charge whatsoever. Other than that, feel free to allow your phone to die and charge it back up. This in conjuction with deleting your battery stats file will speed up the calibration process.
Hope I helped out.
Sent from my HTC Vision using Tapatalk

UnSungHERO420 said:
Draining the battery to a literal 0% is almost impossible. Lithium ion batteries do not allow devices to utilize all the juice in a the battery. Once a device shuts off and tell you the battery is "dead", there's actually a bit more juice that is only used by the battery to prevent the battery's level from becoming too low.
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What is supposed to happen with the failsafes on the device and what ACTUALLY happens unfortunately are not one and the same. There have been plenty of people here that have let their batteries drain to zero, and then the battery will no longer take a charge.
True, the battery is not actually zero voltage. But its low enough that the safety circuit on the battery will prevent it from accepting a charge. The phone is SUPPOSED to prevent the voltage from dipping that low, but it doesn't always work. So the only way to bring the battery back to life, is with a special battery meter with a "boost" function. Since the vast majority of us do not have access to such a thing, the battery is effectively dead, as buying one is likely cheaper and easier than getting access to such a battery meter.
As I've already mentioned, this is unlikely to happen. But its happened to at least a few people with our phone, and I've seen it happen to other XDA users with other devices. No point in playing probabilities, if it happens to you, it sucks and it doesn't matter how "almost impossible" its supposed to be. As I already discussed, the battery meters on phones are not even close to accurate enough to read single, or even 5% battery increments. So draining to zero is not any more beneficial than draining to 10%. No benefit in draining to zero, so why risk it?

I have learned the hard way that discharging lithium ion batteries below 20% is the fastest way to kill them early! (greatly shorten their life)

thanks 4 replies, a lot of useful knowledge

How to make your battery last longest?

So I just got my galaxy s3. I haven't turned it on yet. But I heard that you were supposed to charge it fully and then let it die. Then charge it fully again and then start using it. That when. Doing this you will optimize your battery so it will charge faster, hold a charge faster, and just last longer.
Is this myth or fact? And if fact how do I do the steps so I get it right?
Thanks for the help and sorry for any mistakes it was typed on my phone that has aa small touchscreen.
Sent from my HERO200 using xda premium

Yeah running it fully out of battery like that harms the life of the lithium ion cell

Always?
AshtonTS said:
Yeah running it fully out of battery like that harms the life of the lithium ion cell
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Now is this ALWAYS the case?
To clarify what I am asking I am saying does it always harm the life of the lithium ion cell by letting die fully? Like even after 6 or 8 or 12 months of owing the phone (or any device), not just one the first charge. This could be very useful for further reference...:good:

There are some things can help increase life of litium batteries. First, don't let it go down to 0% as mentioned, keep not lower than 50%. Once per month it is recommended to discharge battery to 0% and then charge it to 100% again for device callibration.

This is a good question. I always thought that by discharging and charging batteries at full cycles, you would make their total useful life last longer.
In fact, this happened to me with a notebook, which I used to play with and charging at the same time. In the end, the battery lasted for a few minutes and I had to sell it.
But in all: is this really true? I would also like to know if is truth or myth.

UnawareQuagsire said:
This is a good question. I always thought that by discharging and charging batteries at full cycles, you would make their total useful life last longer.
In fact, this happened to me with a notebook, which I used to play with and charging at the same time. In the end, the battery lasted for a few minutes and I had to sell it.
But in all: is this really true? I would also like to know if is truth or myth.
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Yes yes!!
This happened too (as funny as it is) my grandma. She would ALWAYS have her little nnotebook plugged in and eventually it drained. I found out because one day I took it off the plug a d it died while I was on facebook after around 7 minutes.
So I bought a new battery and now she charfes iit and takes it off the plug to use it and twice a month she lets it die and it has worked
Sent from my HERO200 using xda premium

1) don't keep live wallpapers
2) keep the brightness to the lowest possible
3) don't charge while playing games or even use the phone
4) don't use apps which run in the background and drain the batter
5) all the suggestions given in the above posts lol
Sent from my MT27i using xda app-developers app

Don't let it die to zero.
When it warns you at 15% just charge it.
Sent from my U8150 using XDA

Allanitomwesh said:
Don't let it die to zero.
When it warns you at 15% just charge it.
Sent from my U8150 using XDA
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Sir i just want to ask If we charge our battery even if its above 20% or if the battery icon is not yet colored red will it affect our battery life in the future? Or we should only charge our battery when it is below 20-15% ?

lanlan_10 said:
Sir i just want to ask If we charge our battery even if its above 20% or if the battery icon is not yet colored red will it affect our battery life in the future? Or we should only charge our battery when it is below 20-15% ?
Click to expand...
Click to collapse
Charge it anytime you want.
Sent from my U8150 using XDA

snipesome said:
So I just got my galaxy s3. I haven't turned it on yet. But I heard that you were supposed to charge it fully and then let it die. Then charge it fully again and then start using it. That when. Doing this you will optimize your battery so it will charge faster, hold a charge faster, and just last longer.
Is this myth or fact? And if fact how do I do the steps so I get it right?
Thanks for the help and sorry for any mistakes it was typed on my phone that has aa small touchscreen.
Sent from my HERO200 using xda premium
Click to expand...
Click to collapse
It is true if you have a phone like Nokia 3310 if you do not have a NiMH battery do not do that you will lose time also you do not need to "format" a Li-Ion battery
read about lazy-battery effect on Wikipedia

rooting you phone to underclock/undervolt should also help out battery life pretty significantly ^_^

Lithium ion cells do not suffer from the "memory" effect as older rechargeable batteries. You do not have to let the battery run all the way down then fully charge it again to get the best performance that way, that was for the older types of batteries (again so you wouldn't get that "memory" effect) matter of fact its rather harmful to the battery to run it all the way down.
Charge the battery as often as you want no matter at what level it is. If you are going to do some high power **** (play a game, watch a movie) then plug it if if you have a charger around. The longer the battery stays at a high level the better for it. Try not to let your battery run your phone at a low state (charge it asap). Its ok to leave it on the charger even after its fully charged. Your phone and charger are smart enough to know when to start/stop charging the battery. This will ensure a long life for your battery.
...as for your phone...simple rules...if you are not using it( DATA, WIFI, GPS, SYNC, BLUETOOTH) then turn it off. Screen is the biggest battery drainer...KEEP IT ON AUTO!...darker themes really help alot...make your screen go off at 30 sec. or less. Have fun with your new phone homie.

mrrobc97 said:
Lithium ion cells do not suffer from the "memory" effect as older rechargeable batteries. You do not have to let the battery run all the way down then fully charge it again to get the best performance that way, that was for the older types of batteries (again so you wouldn't get that "memory" effect) matter of fact its rather harmful to the battery to run it all the way down.
Charge the battery as often as you want no matter at what level it is. If you are going to do some high power **** (play a game, watch a movie) then plug it if if you have a charger around. The longer the battery stays at a high level the better for it. Try not to let your battery run your phone at a low state (charge it asap). Its ok to leave it on the charger even after its fully charged. Your phone and charger are smart enough to know when to start/stop charging the battery. This will ensure a long life for your battery.
...as for your phone...simple rules...if you are not using it( DATA, WIFI, GPS, SYNC, BLUETOOTH) then turn it off. Screen is the biggest battery drainer...KEEP IT ON AUTO!...darker themes really help alot...make your screen go off at 30 sec. or less. Have fun with your new phone homie.
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This helps a lot than
ks. I think I am going to make a video on the stuff that has been shared on this thread. My YouTube is the same as my xda. Snipesome. I have 2600 subs and partnered. Is anyone more qualified who would like to mske it instead?
Sent from my HERO200 using xda premium

When should i replace the battery?

I am using p500 from one and half years and i use it heavily so i have to charge it every day. Now i feel that the battery has done his job
And now i am getting a poor battery life
Sent from my LG-P500 using xda app-developers app

> how poor is it? about how many hours on normal usage? I use mine heavily on one day and it last 8-9hrs

I'm using my phone since 19 months and battery is fine heavy usage gets me 8-10 hrs battery while moderate gets about 24Hr and simple usage(just for call and msg) gets me more than 50hrs..

A Lithium-ion battery has normally 400-1200 charging cycles (Ref. Wiki).
Couple of things that shorten life span of a battery:
1) Complete discharging, it is recommended not to go below 20%
2) High temperature which implies that if you OC too much your device will heat up and battery life shortened
3) If you consume 50% of your device battery on day 1, recharge to 100% at night, and do the same thing on day 2, then you would have just finished up one charge cycle of its battery life. Constantly recharging a lithium ion battery does not shorten the battery life more than normal usage would. Hence constantly recharging a lithium ion battery does not shorten the battery life more than normal usage would. Avoid letting it sit on empty for too long; instead, keep it charged-up if you can. (REF.)

My battery behaves in a funny way. With moderate use it dissipates very fast. and then if I keep screen off for more than 10 mins then my battery starts regenerating automatically(5-7%)

I noticed a few times, with some of the phones or devices I used to own, that if you, for example, after charging the phone, let's say play a graphics intensive 3D game for 15 minutes, the battery meter will drop quite a lot(e.g. 15%). But if you leave it on stand-by immediately, you will notice that after some time, the battery meter will indicate with 3-5-7% more than before.

My battery life is under 2 hours in 3g continues downloading!
Sent from my LG-P500 using xda app-developers app

nundoo said:
I noticed a few times, with some of the phones or devices I used to own, that if you, for example, after charging the phone, let's say play a graphics intensive 3D game for 15 minutes, the battery meter will drop quite a lot(e.g. 15%). But if you leave it on stand-by immediately, you will notice that after some time, the battery meter will indicate with 3-5-7% more than before.
Click to expand...
Click to collapse
I have also faced this but differently
At night my phone's battery was 78
And at the morning i got 82 %!!
Sent from my LG-P500 using xda app-developers app

nomancoolboy said:
I am using p500 from one and half years and i use it heavily so i have to charge it every day.
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I think it's "normal" to charge it every day!! if you use it!! i charge it at least one time a day..

Lithium battery's do last a long time but they do loose there charge and become weak. After a year and a half I would defiantly consider buying a new battery. I wouldn't recommend the cheap $3.00 battery's but I would look on eBay or amazon and find a stock o.e.m battery. Brand battery's are more expensive but last probably 3-5 times longer then cheap battery's. I've read and heard that lithium battery's are not suppose to get hot but they can get warm, if the battery gets hot then it can destroy the battery and won't hold a charge as long as it should.
It also depends on what ROM you are running and what applications you are running, all that can add up and drain your battery fast. I would change a battery on a phone about 5-7 months or maybe even up to a year. Depends on your budget and what you can afford. hope this helps
Sent from my Nexus 7 using Tapatalk 2

myawan said:
A Lithium-ion battery has normally 400-1200 charging cycles (Ref. Wiki).
Couple of things that shorten life span of a battery:
1) Complete discharging, it is recommended not to go below 20%
2) High temperature which implies that if you OC too much your device will heat up and battery life shortened
3) If you consume 50% of your device battery on day 1, recharge to 100% at night, and do the same thing on day 2, then you would have just finished up one charge cycle of its battery life. Constantly recharging a lithium ion battery does not shorten the battery life more than normal usage would. Hence constantly recharging a lithium ion battery does not shorten the battery life more than normal usage would. Avoid letting it sit on empty for too long; instead, keep it charged-up if you can. (REF.)
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Click to collapse
Lg p500 battery have only 500 cycle times of life .
Btw,try to flash stock/gsnap 2.2 rom.
Sent from my LG-P500 using xda premium

My battery behaves in a funny way. With moderate use it dissipates very fast. and then if I keep screen off for more than 10 mins then my battery starts regenerating automatically(5-7%)
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Reset battery stats in recovery.
-- Sent from my TouchPad using Communities

[GUIDE] How to prolong the life of your Li-Ion battery

First off this isn't a guide about how to make your battery last longer between charges, at least it isn't yet. If a demand arises I will happily facilitate. *EDIT* For simplicity's sake I am including a link to V7's battery guide which addresses increasing the time between charges. ✭[GUIDE][26-07-2016]Extreme Battery Life Thread(Greenify+Amplify+Power Nap)✭This guide is about reducing wear that happens from many thing we all either knowingly do; out of a possible misunderstanding, or ignorance. All of this information is available doing a simple Google search, I am posting it here though for those who otherwise would not think to Google it. Furthermore I claim credit for absolutely none of this, but I do hope you find it helpful.
HOW TO PROLONG YOUR Li-Ion BATTERY'S LIFE​
1) Keep your battery at room temperature: Heat is the worst enemy of your cell phones battery. So keeping your battery at room temperature (65-75*F) is the first step towards prolonging your battery's life. According to Battery University
each 8°C (15°F) rise in temperature cuts the life of a sealed lead acid battery in half.
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They also go on further adding
Once the battery is damaged by heat, the capacity cannot be restored.
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There are many things you can do to keep your battery cooler, such as taking it off the charger when the phone is done charging, and avoiding prolonged continuous usage. Also avoid leaving your phone in your car, it gets upwards of 140* in a car during the summer. The worst thing that can happen to a Li-Ion battery is a full charge and high heat, so avoid charging your phone until your car has cooled off if you are charging your battery in the car. Heat is by far the greatest factor when it comes to reducing the lifespan of a Li-Ion battery.
2) Use partial-discharge cycles: According to lancair.net
Using only 20% or 30% of the battery capacity before recharging will extend cycle life considerably
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Other sites I read while researching this stated that users should use up to 80% of their energy before recharging, they were all consistent with regards to a few things including: avoiding full discharges will prolong battery life, and it takes several partial charges to use one full charge cycle. Additionally Li-Ion batteries do not have "charge memory", but your digital device most likely does. Discharging the battery until cut off after every 30 charge cycles re calibrates the devices gauge.
3) Avoid keeping your battery at 100%: Every source I referenced for this guide said the same thing about keeping your battery at a full capacity, but oranageinks.com explains it most simply by stating
Permanent capacity loss is greatest at elevated temperatures with the battery voltage maintained at maximum (fully charged).
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4) If you are going to store your battery for an extended period store it at about 50% charged: This goes hand-in-hand with number 3. Also keeping the battery cool during extended storage will slow deterioration. Keeping the battery in a sealed bag or tupperware in your refrigerator is okay, but storing your battery in the freezer is not. When a battery is fully charged oxidation is occurring at its highest rate, and oxidation is essential corrosion. Oxidation occurs whether the battery is in use or not, for this reason it is better to get a high capacity battery rather than a spare. So with this said it almost should go without saying that if you can, buy batteries with a recent manufacture date.
5) Avoid completely discharging your battery: Lancair.com states:
Very deep discharges will quickly, permanently damage a Li-ion battery. Internal metal plating can occur causing a short circuit, making the battery unusable and unsafe. Most Li-ion batteries have protection circuitry within their battery packs that open the battery connection if the battery voltage is less than 2.5 V or exceeds 4.3 V, or if the battery current exceeds a predefined threshold level when charging or is charging
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If you found this helpful please don't forget to hit the "Thanks" button

now that explain why my battery drain so fast,my phone temperature is a bit high these days,thank you :good

I decrease my battry drain with installing som suitable kernal
this way realy effective in my device battry mangement

You're absolutely right, and you hit the nail on the head,
Saeedblack said:
realy[sic] effective in my device battry[sic] mangement
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But the physical battery itself needs care too. Device battery management is more related to how much power the CPU sees that the device has. Understanding how a Li-Ion battery works is kinda important at this point. So basically the positive electrode is made of Lithium cobalt oxide (cathode), or LiCoO2. The negative electrode is made of carbon (anode). When the battery is charging, ions of lithium move through the electrolyte from the positive electrode to the negative electrode and attach to the carbon. During discharge, the lithium ions move back to the LiCoO2 from the carbon. Over time the Lithium ions bond to the carbon thereby restricting the flow, creating resistance which decreases the battery's ability to deliver current. So properly caring for your battery is really the only thing that will slow the inevitable. Its kinda the same thing for a car...all cars eventually die, but if you take care of them they will last much longer than if you neglect them.

Thanks for this. It's not the usually same guide for battery improvementent.
My battery life got a little better.

Thanks mate, that's some good information.

Hi.
Just wondering:
in "5) Avoid completely discharging your battery"
Most battery calibration softwares say you SHOULD fully discharge your battery then fully charge it for a good calibration.
So, someone like me, who likes to try new roms, new nightlys all the time, are "slowly" burning the battery to ashes by calibrating it after every flash.

It looks like running the processor faster than specified (overclocking) can result in higher temperatures inside the device and faster battery wear as a result.

azraelus said:
Hi.
Just wondering:
in "5) Avoid completely discharging your battery"
Most battery calibration softwares say you SHOULD fully discharge your battery then fully charge it for a good calibration.
So, someone like me, who likes to try new roms, new nightlys all the time, are "slowly" burning the battery to ashes by calibrating it after every flash.
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Click to collapse
YES you are slowly burning the battery out, by draining it after every flash. The battery is going to die inevitably anyways though, most of the sources I found suggest doing a "full drain" every 30 charge cycles. Perhaps this is when you should go ahead and do your battery calibration. Also a full drain is not exactly self-explanatory in this case. Your device may say that a battery has 1% of its energy left and to an extent it does, but the battery is designed to cut off before it gets too hot or too low. If you have a tendency to cut your phone back on after it dies then you will deplete the battery completely, possibly resulting in permanent damage.
adrian816 said:
It looks like running the processor faster than specified (overclocking) can result in higher temperatures inside the device and faster battery wear as a result.
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Yes O/C can raise temperatures of the device. Certain kernels run a little hotter than others. My device is currently O/C'd and isn't any hotter than normal when I am not using the device due to CPU governors and what not, and its only marginally hotter than it is when at the stock clock speed. Prolonged heavy use takes a toll on the battery, due to the heat its creating. Also don't let the little bit of heat increase stop you from O/C'ing your device. Many manufacturers use the same cpu with different clock speeds, EX Snapdragon S3 chip is used in the EVO 3D @ 1.2GHz, and the HTC Rezound @ 1.5GHZ from the factory. This is done to reduce power consumption on power hungry phones or to extend the life of a cpu that has proven itself reliable(such as in the example of the Snapdragon S3)...it also helps to market devices without spending more on development.

Good adwise! :good:

This is all very good advice. A lot of it I knew, but I learned a couple new things as well. Glad to see someone making it more easily available to our community!
Sent from my SGH-I777 using xda app-developers app

Found this same information when researching my netbook battery.Turns out there is a good reason it will sleep/hybernate/power off at 3 percent, can damage a cell. On the upside this one will charge faster.

Thanks for the information.
Sent from my GT-S5360 using Tapatalk 2

Oh god, by "avoiding keep it at 100%" you mean "don't use it constantly while charging", right?
I have a seriously problem.

Wish I could do something about #1. My phone can get pretty hot when I'm using it and I like to do a lot of things like playing games or dling torrents which gets it toasty.
Will definitely unplug before 100% from now on though. Thanks

Jane Shizuka said:
Oh god, by "avoiding keep it at 100%" you mean "don't use it constantly while charging", right?
I have a seriously problem.
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Yea that's pretty much the gist of it...heavy use while charging creates even more heat than just heavy use or just charging. Since doing the research for this thread I've been doing things a little differently myself. Instead of leaving it on the charger most of the day I charge it at night and use it til about 50% then charge it up to 80%...it may be in my head but I highly doubt it. Doing as I described I have had 1 full charge (from 40% to 100%) and a top off charge (50% to 80%) and my device has been on since yesterday morning (so 36 hours+ with only a 30% top off charge). This is with moderate use, and my phone is currently at 70%...MUCH better than before though.
This guide is still meant more for longer term physical battery care, but it appears to have helped extend time between charges.
zlc1 said:
Wish I could do something about #1. My phone can get pretty hot when I'm using it and I like to do a lot of things like playing games or dling torrents which gets it toasty.
Will definitely unplug before 100% from now on though. Thanks
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Try a different kernel, or underclocking your phone, that should help with the heat.

Thanks, I'll keep this in mind!

Thanks for the advice, but i thought discharge it completely wont do any harm to the battery since the protection circuit will stop at around 3..0-3.4 mV?

ryanshady said:
Thanks for the advice, but i thought discharge it completely wont do any harm to the battery since the protection circuit will stop at around 3..0-3.4 mV?
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That is about the point the device will cut off, but if you turn it back on like I used to until the device won't turn back on that's when the battery is completely discharged. Battery University goes on to say
Each cycle wears the battery down by a small amount. A partial discharge before charge is better than a full discharge. Apply a deliberate full discharge only to calibrate a smart battery and to prevent “memory” on a nickel-based pack.
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Link to article HERE
*EDIT*

i wish there's a way to stop charging once it reaches 85-95% like my laptop...