Develop Bugs

battery observations w/ questions

So I've been running some random tests with my battery and usage to try and figure out how this thing maintains charge and such. I'm running rooted stock TW 4.1.1 with Juice Defender.
1. Usually, I charge the phone overnight while I sleep, then when I unplug it, it drops down to 99% immediately. Lately, it's been dropping down to around 96% in 45 minutes of no use then leveling off. This is with a new battery that replaced another one right after the Jellybean upgrade as I thought my battery was busted.
2. I usually get about 12-14 hours with 2.5-3hrs of screen time (I get crappy service where I work and the phone is in airplane mode when not in use, and when in use, it has bad service).
3. This weekend, I didn't charge it over Friday night and let it die Saturday morning. Then I charged it for about 3 hours or so and ended up getting about 34ish hours with 3.5 hours of screen time out of it (using wifi and better network since I'm at home).
4. I charged it overnight last night (about 9 hours) and when I unplugged it, it dropped to 98 immediately, then 30 minutes later it was down to 96 again.
With all that said, I'm thinking that I probably should not be charging my phone overnight at all anymore. The only problem with that is that I don't have enough time in the morning to charge it before work and I can't charge it while at work as I move around all day.
Will I wear my battery down more by not fully charging it and using it throughout the day and only charging it when I can? I've read that battery website that people post constantly where they talk about how the new batteries stop charging after a certain period of time, but if that were the case, why would I get better battery service from only charging for 3 hours then leaving it overnight?
I know there are a million battery threads on here and we probably didn't need another one, but i thought I'd try to create one with a bit more substance than "oh i get 6 hours with 5 hours screen time on such and such a ROM". I'm more interested in the physical methods than the software methods for getting the best out of the battery.

The quick drop off in battery charge is probably partly due to some hysteresis that has already built up. There is a lag time between the voltage demand on the battery and the battery's ability to deliver the required current. Energy is lost during this lag time.
I posted this another forum so I am recycling but it is relevant.
Some general guidelines when charging Li-ion batteries:
A slow charge is preferable because it reduces heat and hysteresis. Heat of any sort decreases the overall life of the battery. Hysteresis reduces the performance of the battery in the discharge state causing a quicker plummet in battery charge from 100%. (NiMH batteries are worse with hysteresis, but Li-ion cells suffer from hysteresis also).
Unplug the charger as soon as possible when the battery is fully charged.
Lithium ion cells however can not tolerate overcharging or overvoltage and the charge should be terminated immediately when the upper voltage limit is reached.
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Do not use charging pads or mats as they introduce more heat.
Pulse chargers do the best job because they give the battery brief rest periods to allow the chemicals to settle and accept the charge with reduced hysteresis and heat.
A memorable though not quite equivalent phenomenon is the pouring of beer into a glass. Pouring very quickly results in a lot of froth and a small amount of beer at the bottom of the glass. Pouring slowly down the side of the glass or alternatively letting the beer settle till the froth disperses and then topping up allows the glass to be filled completely.
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Depth of discharge. Consistently letting the battery run down to very low reduces the overall lifetime. It is better to minimize the depth of discharge by topping off when convenient than running it down completely.
Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The shorter the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often between uses. Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles to prolong life, other than to calibrate the fuel gauge on a smart battery once in a while.
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Can't yet post direct links
Battery University . Com
mpoweruk . com / chargers . htm

gotcha. so i shouldn't be charging it overnight anymore. thanks for all that other info, too. very useful to know.

Battery Life/Damage

Hey guys I'm often a lurker on here and don't post a whole lot but came across this article and found it interesting. Thought I'd share... Also, I like to leave my HTC ONE plugged in on my desk stand at work with the "Daydream" clock function running (basically using my phone as a desk clock). Do you think leaving it plugged in charging all day running this clock is doing any damage to my battery? It of course fills up and charges to 100% pretty quickly because I never really let it get below 80%. Below is my charging habit...
1. Charges all night at my bedside
2. Take it off the charger in the morning while getting ready for work and my drive
3. Get to work, plug it in for 6-7 hours running Daydream
4. Take it off the charger and go home... (off the charger for about 4-5 hours in the evening)
5. Go to bed, plug it in, and start all over again...
Oh and here's the article :lol:
http://gizmodo.com/going-from-all-the-way-full-to-all-the-way-empty-wont-h-618834847
How To Take Care of Your Smartphone Battery the Right Way
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Your smartphone is a minor miracle, a pocket-sized computer that can fulfill almost every whim. But none of its superpowers matter a bit if it runs out of juice. With removable batteries becoming more and more rare, you've got to take good care of the one you got. Fortunately, it's not to hard keep the lithium-ion powering your everything machine happy if you follow a few simple rules.
Obviously, the first rule for extending your battery life is not using up all your battery life playing candy crush and walking around with Wi-Fi and GPS enabled when you're not using either and really, really need your phone to last that extra hour. But aside from that, there are some basic rules for care and charging, and they're the simplest baseline for a healthy battery.
Top it off
You may vaguely recall hearing something about rechargeable batteries and the "memory effect." You know, that if you don't "teach" your rechargeable batteries their full potential by taking them from totally full to totally empty, they'll "forget" part of their capacity. Well forget all that. Right now. It's wrong.
To get the most out of a lithium-ion battery, you should try to keep it north of 50 percent as much as possible. For the most part going from all the way full to all the way empty won't help; in fact, it'll do a little damage if you do it too often. That said, it's smart to do one full discharge about once a month for "calibration," but don't do it all the time. Running the whole gamut on a regular basis won't make your battery explode or anything, but it will shorten its lifespan.
So if you're really particular about optimizing your battery's life, you should try to go from around 40 percent to around 80 percent in one go, and then back down whenever possible. A bunch of tiny charges isn't as bad as going from 100 down to zero all the time, but it's not optimal either.
Keep it cool
It's easy to worry about bad charging habits thanks to the training we've had from old rechargeable batteries, but lithium-ion batteries have a worse enemy: heat. Your smartphone's battery will degrade much much faster when it's hot, regardless of whether it's being used or just sitting around doing nothing.
At an average temperature of 32 degrees fahrenheit, a lithium-ion battery will lose six percent of its maximum capacity per year. At 77 degrees, that number jumps to 20 percent, and at 104 degrees it's a whopping 35. Sure, it's not exactly practical (or sane) to keep your phone in the fridge, but it's worth going out of your way to prevent long stays in hot cars and the like.
Avoid wireless charging
Wireless charging is can be incredibly convenient if your phone can do it, but it's not without its disadvantages. The inductive, wireless chargers out there today have this nasty habit of generating a fair bit of waste heat. And while wasted energy is just a bummer in general, that heat will also toast your battery in the process. That's no bueno. It's a little less convenient, but standard plug-in charging is going to keep your battery in better shape, especially if you're some place warm to begin with.
Never go to zero
Obviously, using your battery is going to make it degrade. But it's going to slowly die even if you just leave that iPad in the closet for a bit. There's a trick to minimizing that inevitable aging though: leave it a little bit of juice.
If you're going to be shelving any lithium-ion battery for a long time, try to leave it with at least 40 percent battery power to tide it over. Lithium-ion batteries don't hemmorage power at 30 percent a month like nickel-metal-hydride batteries do; they'll lose maybe five to ten percent of their charge each month.
And when lithium-ion batteries get too low—like, literally zero percent—they get seriously unstable, and dangerous to charge. To prevent explosion-type disasters if you do try to charge one, lithium-ion batteries have built-in self-destruct circuits that will disable (read: destroy) the battery for good, if it reaches rock bottom. And sure, that'll save you from a face full of battery-acid, but it'll also leave you short one battery.
Don't sweat it too much
It's easy to get protective of your battery, but it's also easy to get lazy. And that's fine, because as long as you're not a complete idiot, you'll be OK. Typically, a lithium-ion battery lasts for three to five years, and chances are you're going to want to swap out your gadgets sometime in that window anyway. The slight damage of a technically bad idea like leaving your phone plugged in all night every night, or using wireless charging, might be worth the convenience.
Still, it's pretty easy to keep your battery reasonably healthy just by avoiding particularly egregious torture like letting your phone discharge from full to zero every single day, or leaving it in a hot car all the time. And the next time you make it back home with power to spare, you'll thank yourself for it.
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I dont agree that your battery dosent like being or performs worse at a 100%. Or that it harms the battery in any way. I keep my phone plugged in as much as possible durring the day, and all night long. But i only use the wall charger that came with the phone, or a smart car charger made for my phone. Because as the article says, these chargers are smart enough to stop charging for awile after the phone has reached 100% to prevent over charging/heating. Cheap wall and car chargers dont have this feature and continuously provide a charge to the phone. Also charging using a usb port on a pc or other device does not provide this overgharge protection.
My last phones battery lasted for almost 3 1/2 years before needing to be replaced. Heres what i do.
Keep it charging as much as possible only with a "smart" charger.
Never let the batter drain all the way down. If it gets to 10% and i cant charge it at the moment, i turn it off.
Never let your device get too hot. Dont leave it in hot cars or sitting in the sun, etc.
Never "bump charge". That is just a way to trick a smart charger into overcharging your battery.
Also over clocking/volting your phone puts more strain on your battery than it was intended to take. It makes its temperatures rise higher, and the charge to deplete in a more rapid fassion. Both of which are bad for your battery.
These are just my opinions of course, but it seems to work out good for me. I think 3 1/2 years is a pretty acceptable life span.

never let it die

I have always left my phone's plugged in constantly and never an issue. Once my phone hits 100% it stops charging and then is very cool to the touch from then on.I heard phone's now has a failsafe that will stop charging and start running the phone off the charger and not battery.
Sent from my HTC6500LVW using Tapatalk

What's the best battery conservative rom?

Why do you think you should never fully drain it?
Every 30-40 days, you should fully drain your battery - until your phone automatically powers down - and then fully charge it - and allow it to stay on the charger for 30-40 minutes after it's 100%.

cope413 said:
Why do you think you should never fully drain it?
Every 30-40 days, you should fully drain your battery - until your phone automatically powers down - and then fully charge it - and allow it to stay on the charger for 30-40 minutes after it's 100%.
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Draining a lithium ion battery all the way can damage the cells causing irreversible damage to the battery. Read this
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my One using Tapatalk

disconnecktie said:
Draining a lithium ion battery all the way can damage the cells causing irreversible damage to the battery. Read this
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Sent from my One using Tapatalk
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The battery management system in the phone does not allow the cells to go lower than the safe level. For Li-ion cells, that's somewhere around 2.7-3.0volts/cell.
If it did, there'd be not only a huge warranty liability, but also a safety one.

cope413 said:
The battery management system in the phone does not allow the cells to go lower than the safe level. For Li-ion cells, that's somewhere around 2.7-3.0volts/cell.
If it did, there'd be not only a huge warranty liability, but also a safety one.
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You can believe that if you want to but if you actually read that link you will understand. It puts a lot of strain on the cells to go that far down. There is a physical reaction inside your battery of growing and stretching created from the charge/discharge cycle. If you regularly drop the charge to nothing then it makes it harder for it to keep a charge over time. You're more than welcome to do your method of calibration but I'm a firm believer in keeping the battery healthy.
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disconnecktie said:
You can believe that if you want to but if you actually read that link you will understand. It puts a lot of strain on the cells to go that far down. There is a physical reaction inside your battery of growing and stretching created from the charge/discharge cycle. If you regularly drop the charge to nothing then it makes it harder for it to keep a charge over time. You're more than welcome to do your method of calibration but I'm a firm believer in keeping the battery healthy.
Sent from my One using Tapatalk
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I didn't say regularly. I said every 30-40 days. I have a lot of experience with lithium cells - both manufacturing and selling.
Before getting the One, I regularly used my HiTec lithium charger on my thunderbolt battery to run a discharge cycle, and then balance/charge it slowly.
No one need be afraid of their phone getting below 10%. It isn't causing any damage.

Well i guess its all a matter of opinion. Me and my wifes first smart phones were the htc incredible. I would never let mine die and the battery lasted fir 3 1/2 years. My wife would let hers die once or twice a month, and it lasted for 14 months before it needed a new battery. Got on her about not letting it die after we replaced the battery, much to my surprise she listened, and the replacement lasted for another 2 1/2 years. Both of our batteries actually still work today just not used to much anymore.

I had the dinc2 and followed the same procedure he used and pretty much nuked a battery from doing that same procedure. In less than a year my battery was bad. To each their own but I still don't suggest running it all the way out.
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even anker, who is is probably the biggest portable battery manufacturer recommends not letting their products get below 25% because it can reduce the lifespan of the pack. They state that keeping it between 25-75% is ideal.

Interesting article, thanks for sharing OP.
I also leave my phone plugged in while sitting at my desk and let it charge up. Typically I plug into my laptop via usb while at work, once fully charged it shows 'fully charged' and switches the led status light to green.
I try to never let it die either but have to travel for work and do get very low on occasion, once I get down to 10% I typically just shut to phone off to preserve power while I am flying and avoid turning it back on again til I can get it on a charger.

Battery Life
I'm new to this phone,so I'm not entirely sure how the battery life is ... but I heard a while ago that you get the best battery life out of phones when you only plug them in to charge when they are completely dead. I don't do it often enough to see a difference, but has anybody else done it?

You probably get a much more consistent charge while it is dead/powered off. The only problem there is does letting your phone die occasionally ruin your battery or not?
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danprichet said:
... I heard a while ago that you get the best battery life out of phones when you only plug them in to charge when they are completely dead. ...
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Did you not read the first message in this thread. wherein it says:
To get the most out of a lithium-ion battery, you should try to keep it north of 50 percent as much as possible.
and
Never go to zero.

Alright, alright - I was merely saying I'd heard a theory stating otherwise.
jpradley said:
Did you not read the first message in this thread. wherein it says:
To get the most out of a lithium-ion battery, you should try to keep it north of 50 percent as much as possible.
and
Never go to zero.
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My laptop, which is a Lenovo, has 2 settings. Best battery health and best battery life. Best health keeps the battery charged to between 50-60 percent and then stops the charge. Best life goes up to 100.
Sent from my HTC6500LVW using xda app-developers app

Is it bad to constantly top off your battery?

Note 7 is my first foray into wireless charging. I figured it would be useful at work for me as I can spend random amounts of time away from my desk throughout the day so when at my desk I can drop it on the charger and then grab it when I need to go. I just wondered if thats bad for the battery?
I already did a full drain and then full charge from there and even that I'm not sure if it's still beneficial to do. But with a non removable battery I want to make sure I'm not doing more harm than good and shortening it's life by having it on and off thw wireless charger often during the day. Thanks.

Its not bad, its actually recommended. Keeping the battery as high as frequently as possible will help in the long run.
Using it while its charging isnt so good though.

imatts said:
Its not bad, its actually recommended. Keeping the battery as high as frequently as possible will help in the long run.
Using it while its charging isnt so good though.
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Recommended by whom? The magic dragon?
Sent from my Nexus 6P using XDA-Developers mobile app

it can slowly reduce the lifespan of your battery..

imatts said:
Its not bad, its actually recommended. Keeping the battery as high as frequently as possible will help in the long run.
Using it while its charging isnt so good though.
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From my research into battery life what you write is incorrect. There are other threads on this very subject where I precise my findings.
Ryland

Apparently keeping the battery between 50-80% is the ideal scenario. It's probably ok to change to 100 but leaving it on the charger once it's fully juiced makes the battery heat up too much which is bad for it.
Sent from my SM-N930F using Tapatalk

There has been research that suggests it is better to charge the battery from around 40%-to about 95%, never full.

stas333 said:
There has been research that suggests it is better to charge the battery from around 40%-to about 95%, never full.
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I looked at some of the research people have mentioned and it does seem that between 40 and 80% is the sweet spot on the Lithium Ion batteries. It says not to charge to 100%, but that the phone is smart enough to stop charging ones full to prevent overheating. But regardless I suppose leaving it plugged in overnight isn't the best idea.
But in my case it sounds like multiple charges throughout the day isn't bad on the battery as long as it keeps it in the 40-80% range? I can manage that, just wanted to make sure multiple small(5-10%) charges throughout the day wasn't also shortening its life span.

Hard to say I guess. I was the drain and fully charge guy. Never any issues. My wife is the opposite, she should constantly top it off or close and her battery would drain faster than mine. Eventually hers would die very early. So who knows.
Always been like this with all our phones

I know some firms in the past have built in charge counters in batteries so you could only charge the X amount of times, but that was a fair few years ago and things have moved on since.
but my phones I have charged them multiple times a day and my Xperia Z1 that I got on launch day is still in use by a friend and still has near perfect battery life despite being charged some time multiple times a day and always being left on charge overnight every night. (so thats for about 3 years now?)
my S6 I have ran on the wireless charger since I got the phone on release day, every time I went in the room I chucked it on the pad to keep it charged up, the phone still works and charges flawlessly, the Samsung charging pad unfortunately wasn't as up to the job as the phone was and died last week. but no big loss as I want a fast charging one after I get my note tomorrow.

-The less you recharge your phone, the better
-Keeping your phone between 40-80% is the best theoretical solution for best health. But if you are running your battery down to 40%, and charging back up to 80% twice a day, that's still more wear than just leaving your phone at your desk plugged in at 100%.
Or say you keep it at your desk and you have to move around office 4 times that day. So every time you leave your desk and come back, you charge it back from 90% to 100%. 4 x 10% - 40% is still less wear then the guy doing the 40-80% x 2 a day. Less charging overall.

http://techlife.samsung.com/tips-keep-smartphone-charged-1059.html
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---------- Post added at 05:53 PM ---------- Previous post was at 05:52 PM ----------
According to Samsung.
Sent from my SM-N930V using XDA Free mobile app

imatts said:
Its not bad, its actually recommended. Keeping the battery as high as frequently as possible will help in the long run.
Using it while its charging isnt so good though.
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Wrong. Going above 80% is a "high stress" situation for lithium batteries. It isn't bad, but the best charging practice for absolute longevity is keeping it between 20%-80%.
hackdrag0n said:
Apparently keeping the battery between 50-80% is the ideal scenario. It's probably ok to change to 100 but leaving it on the charger once it's fully juiced makes the battery heat up too much which is bad for it.
Sent from my SM-N930F using Tapatalk
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Leaving it on the charger doesn't heat up the battery. It just keeps the battery in that high stress state, and isn't good long-term. If you are doing intense activities with it plugged in, then yes that is a combo for high heat which is bad for the battery.
dermotti said:
-The less you recharge your phone, the better
-Keeping your phone between 40-80% is the best theoretical solution for best health. But if you are running your battery down to 40%, and charging back up to 80% twice a day, that's still more wear than just leaving your phone at your desk plugged in at 100%.
Or say you keep it at your desk and you have to move around office 4 times that day. So every time you leave your desk and come back, you charge it back from 90% to 100%. 4 x 10% - 40% is still less wear then the guy doing the 40-80% x 2 a day. Less charging overall.
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Not really. Leaving it at 100% all day is not the best idea. It'd be better to let it run down to 20% and recharge to 80%. Unless Samsung routes power directly to the motherboard when plugged in, instead of passing it THROUGH the battery first, it is absolutely better to not keep the phone at 100% and charging while using it, heating it up further, and it is still cycling the power/wear through the cells.
Does any of this matter? No. Unless you keep your phone for 2+ years, you aren't going to notice any difference. Charge it whenever and however you want. The battery isn't going to **** out on you because of how you charge it.

Thought the manufacturer warranty was two years anyway? Android phones are only guaranteed updates every two years so may as well upgrade every two years. If the battery craps out inside that time just warranty it. It's extremely unlikely though.
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TOO MANY MISCONCEPTIONS. Let me clear them up !!!!
1) Lithium batteries like to sit around 50% for prolonged periods.
2) It will NOT hurt to keep your phone on the charger. The charging circuitry cuts off power once the Cell hits 4.35 - 4.4v
3) It will HURT THE BATTERY MORE to keep using it when it is depleted or near depleted. Lithium batteries DO NOT like to go below a certain voltage depending on specific chemistry formulation.
To expand on this. It is BETTER to keep the phone at 95% than it is to keep it at 5%. I personally would NOT want my battery falling low enough that it gives a low battery indication (usually around 15%)
4) High Charge and Discharge LOWERS battery longevity. Lithium batteries prefer to be charged slowly and discharged slowly.
You guessed it. AVOID high charge scenarios such as Fast Charge. AVOID fast discharge scenarios such as gaming with high brightness etc.
5) Lithium batteries do NOT like heat. Again, this is usually caused due to high charge or discharge scenarios.
It also ties in with Fast charge, wireless charge and especially wireless fast charge. Wireless charging is not efficient and energy as wasted as heat.
Personally I disable fast charge and do not use wireless charging. Good old USB Type C already charges quickly enough for me.
I might put this in a new thread.

dermotti said:
-The less you recharge your phone, the better
-Keeping your phone between 40-80% is the best theoretical solution for best health. But if you are running your battery down to 40%, and charging back up to 80% twice a day, that's still more wear than just leaving your phone at your desk plugged in at 100%.
Or say you keep it at your desk and you have to move around office 4 times that day. So every time you leave your desk and come back, you charge it back from 90% to 100%. 4 x 10% - 40% is still less wear then the guy doing the 40-80% x 2 a day. Less charging overall.
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So basically what you are saying is you the more you use your phone, the more wear you will put on your battery.
100% to 0% drain (100% total) is still more wear on the battery than 80% to 40% 2x per day (80% total)?

GUYS... Come on.
Nitemare3219 said:
Wrong. Going above 80% is a "high stress" situation for lithium batteries. It isn't bad, but the best charging practice for absolute longevity is keeping it between 20%-80%.
Leaving it on the charger doesn't heat up the battery. It just keeps the battery in that high stress state, and isn't good long-term. If you are doing intense activities with it plugged in, then yes that is a combo for high heat which is bad for the battery.
Not really. Leaving it at 100% all day is not the best idea. It'd be better to let it run down to 20% and recharge to 80%. Unless Samsung routes power directly to the motherboard when plugged in, instead of passing it THROUGH the battery first, it is absolutely better to not keep the phone at 100% and charging while using it, heating it up further, and it is still cycling the power/wear through the cells.
Does any of this matter? No. Unless you keep your phone for 2+ years, you aren't going to notice any difference. Charge it whenever and however you want. The battery isn't going to **** out on you because of how you charge it.
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Nitemare, you are right. Almost no one is keeping their phone here for 2 years.
Hey everyone... All we needed to do was a search: Here is the quick guide to these batteries. http://forum.xda-developers.com/showthread.php?p=3846897#post3846897
There's a more in-depth article here. http://forum.xda-developers.com/showthread.php?t=518861
Just an FYI. These articles are for 2009 but still hold true. battery tech may have gotten a bit better, but the same rules. Both posts have cited sites as well.

Spike96 said:
So basically what you are saying is you the more you use your phone, the more wear you will put on your battery.
100% to 0% drain (100% total) is still more wear on the battery than 80% to 40% 2x per day (80% total)?
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Basically yes...batteries have a finite amount of charge cycles.
Charging 2000mah into your battery, whether its all at once, or 500mah x 4, should be roughly the same amount of wear on the battery.
For me, only things i ever worry about is deep discharges and heat. Heat is the worst enemy imho.
Everything else is pretty minor when it comes to wear.
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---------- Post added at 10:40 AM ---------- Previous post was at 10:38 AM ----------
THS1989 said:
TOO MANY MISCONCEPTIONS. Let me clear them up !!!!
1) Lithium batteries like to sit around 50% for prolonged periods.
2) It will NOT hurt to keep your phone on the charger. The charging circuitry cuts off power once the Cell hits 4.35 - 4.4v
3) It will HURT THE BATTERY MORE to keep using it when it is depleted or near depleted. Lithium batteries DO NOT like to go below a certain voltage depending on specific chemistry formulation.
To expand on this. It is BETTER to keep the phone at 95% than it is to keep it at 5%. I personally would NOT want my battery falling low enough that it gives a low battery indication (usually around 15%)
4) High Charge and Discharge LOWERS battery longevity. Lithium batteries prefer to be charged slowly and discharged slowly.
You guessed it. AVOID high charge scenarios such as Fast Charge. AVOID fast discharge scenarios such as gaming with high brightness etc.
5) Lithium batteries do NOT like heat. Again, this is usually caused due to high charge or discharge scenarios.
It also ties in with Fast charge, wireless charge and especially wireless fast charge. Wireless charging is not efficient and energy as wasted as heat.
Personally I disable fast charge and do not use wireless charging. Good old USB Type C already charges quickly enough for me.
I might put this in a new thread.
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Pretty much covered it here. Good post.
And avoid high heat scenarios as much as you can.
Sent from my SM-N930T using Tapatalk

Somewhere in the samsung+ app for note 7, it says always keep the battery between 50 -90 for longevity.
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My last phone, an HTC One M8, spent every single night on the charger for the last 2 1/2 years. I would also connect it to a charger in the car when I was driving for any length of time, and that was fairly often as I was traveling regularly. The battery life was not appreciably shorter when I retired it last week than when I first got it.
YM, as always, MV.

Phone shutdown at 4% left

Seem like the battery deceased so fast after 2months of usage.
7+ hrs usage... Still alright...

weretiger said:
Seem like the battery deceased so fast after 2months of usage.
7+ hrs usage... Still alright...
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Is this the first time it happened or this is what's happening all the time now. If it's first time then the system could've read wrong voltage/charge. But if it's constantly happening then I'd say something is wrong. If you want I'd say call up Samsung or your carrier and have them send you a different unit if you don't feel comfortable.

Mine was doing this at 3% for awhile and suddenly it's back to shutting down to 1%

You should be more concerned about leting your device reaching that low on battery, it is very bad for batteries to almost completely discharge, that is really, really worrisome, if for any reason your usage is that demanding and you can not plug your device to an electrical outlet, get a powerbank or a battery case

winol said:
You should be more concerned about leting your device reaching that low on battery, it is very bad for batteries to almost completely discharge, that is really, really worrisome, if for any reason your usage is that demanding and you can not plug your device to an electrical outlet, get a powerbank or a battery case
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I second this. Folks don't understand just how bad discharging their batteries is for the battery longevity. This is why you see so many folks that kill their batteries in 2-3 years. Even a 3 year old battery will still retain a good amount of its original capacity if you do not expose it to full drain and recharge cycles. Top up and top up frequently. This is the best way to ensure a long battery life.

Pretty sure the battery has a system built in to monitor and manage real full depletion.
It probably doesn't deplete to the point of damage.
As far as what percentage it dies on, I mean that percentage is just an algorithm to estimate battery life. It's probably not very precise especially when a percentage is the value output.

I try not to let mine drop below 20% and charge to 80%
Sent from my SM-N975U using Tapatalk

Battery hold from 11% to 0%

Hi all,
occasionally I see my 7 months old Pixel 3a XL can't hold battery power from 11% down. Switches off very fast, abnormally fast. Then if I power it and start it then keeps on restarting until battery level is higher than 5-6%
I use the original charger only. Sometimes it appears, some it does not and I can see it discharges as expected.
I try to keep my battery within 40-100% full and discharge it very rarely to 0%.
Anyone facing those abnormalities? Can't think of connected events - updates, etc ....
Cheers
p.s. after last night happening again, charged the phone from 0% to 86% (phone was off during charge), turned on on 86% and left over night on the shelf. Usually drains 2-3%, this morning it dropped from 86% to 62%. All connections off, nothing unusual shown in the battery usage stats...

TodNex said:
Hi all,
occasionally I see my 7 months old Pixel 3a XL can't hold battery power from 11% down. Switches off very fast, abnormally fast. Then if I power it and start it then keeps on restarting until battery level is higher than 5-6%
I use the original charger only. Sometimes it appears, some it does not and I can see it discharges as expected.
I try to keep my battery within 40-100% full and discharge it very rarely to 0%.
Anyone facing those abnormalities? Can't think of connected events - updates, etc ....
Cheers
p.s. after last night happening again, charged the phone from 0% to 86% (phone was off during charge), turned on on 86% and left over night on the shelf. Usually drains 2-3%, this morning it dropped from 86% to 62%. All connections off, nothing unusual shown in the battery usage stats...
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Click to collapse
That's pretty weird
My 3a xl (about the same age as yours) doesn't use more than 10% max when left overnight. Are you using AOD or anything?
Sent from my Pixel 3a XL using XDA Labs

@Skittles9823 nothing beside stock Android and apps that I've used forever. Strange is that it's occasional - also occassional is initial drain from 100% to 92%.
Maybe its time to flash it - nothing suspicious is shown in batt stats
I use the fast charger that came with it. Not sure how it affects battery life long term. I try to keep it 100% to 40% usually and not charge it if not necessary..

TodNex said:
@Skittles9823
I use the fast charger that came with it. Not sure how it affects battery life long term. I try to keep it 100% to 40% usually and not charge it if not necessary..
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I think popular wisdom is that both fast charging and in particular charging to 100% are not kind to the battery's longivety. Divided opinion about the effect of discharging to low percentages. Personally I charge to between 70 and 80% unless I know I'm going to need more capacity. 3a XL has a bigish battery, which helps. I recharge most nights but only to 70-80%. End of day I usually end up between high 40's and low 30's charge.
I manually set all apps I don't actually need to run in background to 'restricted' background use.

I charge mine up to a 100% often, when using it heavy.. I never heard of charging a battery to 100% being bad for it, unless you believe everything that is told or should I say sold to you.. Sounds like a faulty battery. If still under the 1 yr usual warranty I would have it replaced. I have drained mine down to less than 20% and still never experience any issue that OP state.

doubledragon5 said:
I never heard of charging a battery to 100% being bad for it
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Click to collapse
Some research references in here
https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology
https://accubattery.zendesk.com/hc/...-Cycle-Life-Modeling-of-Lithium-Ion-Batteries
Also Apple have actually introduced a feature to stop/postpone 100% charging when the phone thinks it's not required. Would be good if we had similar/more control for Android.
https://support.apple.com/en-us/HT210512

WibblyW said:
Some research references in here
https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology
https://accubattery.zendesk.com/hc/...-Cycle-Life-Modeling-of-Lithium-Ion-Batteries
Also Apple have actually introduced a feature to stop/postpone 100% charging when the phone thinks it's not required. Would be good if we had similar/more control for Android.
https://support.apple.com/en-us/HT210512
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I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.

doubledragon5 said:
I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.
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It's actually true. Lithium Ion batters degrade over time, the speed of which, depends on the amount of battery cycles they go through (0-100% and vice versa). Others have done the research and the math and found that generally a 20% to 80% and vice versa charge seems to be the best for longevity.
Personally I charge to 100 but try to charge my phone when it gets to 20-30%.
Sent from my Pixel 3a XL using XDA Labs

doubledragon5 said:
I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.
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Evidence and research is there. Of course you don't have to believe it. It's your phone, your battery, your money

WibblyW said:
Evidence and research is there. Of course you don't have to believe it. It's your phone, your battery, your money
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So very true my phone my money. In all my years of using cell phones, I think I have actually replaced a battery once because it went bad.

Thank you all for the links and the inputs!
One more symptom - when is very low like this morning - 1% and put it in charger - phone shuts off.
I will keep the battery in 40-80% for the future and limit the drain below 40%. I tried to charge it slow with USB - took me like 6-7 hours...
How long it takes you from zero to 100% with the stock charger - looks very fast to me - 0% to 67% in 35 mins
I personally tried to research and could not find what is worse for these batteries - number of cycles (obvious less when used below 40%) or the low capacity usage ?

TodNex said:
Thank you all for the links and the inputs!
One more symptom - when is very low like this morning - 1% and put it in charger - phone shuts off.
I will keep the battery in 40-80% for the future and limit the drain below 40%. I tried to charge it slow with USB - took me like 6-7 hours...
How long it takes you from zero to 100% with the stock charger - looks very fast to me - 0% to 67% in 35 mins
I personally tried to research and could not find what is worse for these batteries - number of cycles (obvious less when used below 40%) or the low capacity usage ?
Click to expand...
Click to collapse
The included charger is a fast charger, good for headlining how fast it charges, not so great for the battery. I just use a 'standard' (Anker) USB charger.
Jury's out on if deeper discharge is bad, but it's the number of complete cycles (0-100% counting as 1). So 40 - 80% is 0.4 of a full cycle, and you're not stressing the battery so much by taking it to 100%. Many folk here replace their phones frequently enough not to be bothered by all this - if they sell it when 20% of the battery capacity's gone, that's fine.

I've observed the behaviour and few things made me question myself...one time I can see 13% battery and palying Youtube just shutdown the phone. Put it into charger and started showing 4% as initial charge.
There was another time when using Viber video shutdown in 23% but can be overheat or software bug.
I try to keep it these days above 40% charge but still use the supplied charger till I buy new slower one.

TodNex said:
I've observed the behaviour and few things made me question myself...one time I can see 13% battery and palying Youtube just shutdown the phone. Put it into charger and started showing 4% as initial charge.
There was another time when using Viber video shutdown in 23% but can be overheat or software bug.
I try to keep it these days above 40% charge but still use the supplied charger till I buy new slower one.
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The good news is that this phone seems to be pretty easy to repair and a battery replacement could very well be a good option for you, especially since you wouldn't be compromising any water resistance or anything