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Does leaving plugged in harm battery?

I turn my phone on Airplane mode and unplug at night while I'm sleeping.
BUT! When at work and at home at other times, is it bad to leave it plugged in 100% of the time? (I.E. does it decrease total battery life over a few years to be constantly charging.)
Or is it better to unplug ASAP when it hits 100% and let it drop to 20-30% and recharge-unplug-recharge-unplug etc? (If so, how much of a difference would this make?)
And does it matter USB vs AC source? I know USB is half the amps, so this could have an effect too?

Honestly, the battery is going to deteriorate a bit either way over a year time span. It is probably best if you just replace the battery every year.

Paul22000 said:
I turn my phone on Airplane mode and unplug at night while I'm sleeping.
BUT! When at work and at home at other times, is it bad to leave it plugged in 100% of the time? (I.E. does it decrease total battery life over a few years to be constantly charging.)
Or is it better to unplug ASAP when it hits 100% and let it drop to 20-30% and recharge-unplug-recharge-unplug etc? (If so, how much of a difference would this make?)
And does it matter USB vs AC source? I know USB is half the amps, so this could have an effect too?
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Click to collapse
Doesn't matter. All you need to really be worried about is that you leave it on the charger long enough to get a true 100% charge, and you don't always put it on when at 80%, try and run it down from time to time to 10% type thing.
If you leave it on the charger 24/7 for a year, it will have no real effect on the battery that a year of use wouldn't do, and you might actually come out ahead since battery life times are based on charge cycles... when on charger, as you are asking about, there would be virtually no charge cycles.

pjcforpres said:
If you leave it on the charger 24/7 for a year, it will have no real effect on the battery that a year of use wouldn't do, and you might actually come out ahead since battery life times are based on charge cycles... when on charger, as you are asking about, there would be virtually no charge cycles.
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Ooooh, interesting... Did not know that. I thought that leaving it charging was the worst case possible.

But let's be honest.
How long do you think you'll keep the phone?
I've never had one more than a year...

Amdathlonuk said:
But let's be honest.
How long do you think you'll keep the phone?
I've never had one more than a year...
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Til the Nexus Two comes out bro
[Edit]: Well, my thinking is how BAD could this affect it. Like leaving it plugged in all the time = 50% battery capacity in 4 months type of thing. I guess that is not the case though eh?

Paul22000 said:
I turn my phone on Airplane mode and unplug at night while I'm sleeping.
BUT! When at work and at home at other times, is it bad to leave it plugged in 100% of the time? (I.E. does it decrease total battery life over a few years to be constantly charging.)
Or is it better to unplug ASAP when it hits 100% and let it drop to 20-30% and recharge-unplug-recharge-unplug etc? (If so, how much of a difference would this make?)
And does it matter USB vs AC source? I know USB is half the amps, so this could have an effect too?
Click to expand...
Click to collapse
To add to what pjcforpres said, I would suggest topping off the battery a couple times a day rather than always letting it run down to 20-30% (deep cycling) the battery. Deep cycling is worse for Li-ion batteries. It causes more heat for longer periods of time when you do charge. I would only discharge completely once every few months to keep the battery calibrated.
My personal habit is to top off frequently. If I'm at home, I'll let it charge to a true 100%, like pjc said, then take it off the charger and leave it off till it hits 75-80% and top it off again.

i can add to this discussion what i've learned about lithium-ion batterys
having it plugged in, while it is being taxed heavily (playing games) and already at 100% is a bad idea, then i discharges and recharges all over the time.
When it isn't full and you plug it in to top it off it shouldn't really do any harm, as long as you disconnect it when it's at 100%.
Emptying it completely also lowers overall capacity, 10% is a good threshold when to charge it.
When leaving it off to store it for a while, store it with around 70-75% in the battery. Storing it fully charged also lets capacity down.

creepinshadow said:
i
Emptying it completely also lowers overall capacity, 10% is a good threshold when to charge it.
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I thought you WANTED to do this? I've heard calibrating it is running it until it turns OFF?

Paul22000 said:
I thought you WANTED to do this? I've heard calibrating it is running it until it turns OFF?
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I respectfully disagree with creepinshadow's suggestions. I've read up on lithium ion batteries considerably in the last few years. 10% is not a good threshold to always charge your battery from... that's deep cycling and was great for nickel metal hydride, but isn't good for lithium ion. That said, there's no way for it not to get that low from time to time if you're away from your charger for extended periods and I'm sure it's not going to destroy your battery as fast as one might think.
As for storage, the I charge (or discharge) mine to 40-45% then pop it into the fridge for storage. Read that in a long article explaining how to treat li-ion batteries.
Like you said though, a full discharge for calibration is running it till it turns off then plugging it in while keeping it off until an hour or so after the light turns green.

I've heard many people say that leaving any device that has a battery plugged in won't harm it as long as you're consistant with the charge cycles. Like only plug in your phone when the battery life is >15% and charge it to 100% before unplugging it.
I get into trouble there, because (for instance) say I'm going to be going into the mall for a while and my battery is at 30% and it's going to take me 30 minutes to get the mall (I live in Northern Virginia, traffic is a *****, haha). I'll hook up my phone while I'm in the car just to have extra battery life while I'm away from a charger.

good question, i wanted to know the exact same thing so good to see someone else ask. got the answers i needed.

Look guys... the reality is that this discussion is really just academic. Take my recommendations, for example. It would be ideal if everyone could do what the study I read suggested, but it's not practicable to always top off the battery and not deep cycle the battery frequently. That being said, I'm sure the difference in battery life wouldn't be apparent for a very long time. I can't imagine phone and battery manufacturers haven't thought about this. So...while I've posted my "recommendations" based on that study... just enjoy your phones.

A new battery cost <$50 i'm sure... If you left your phone plugged in over night, every night for a year it probably won't hold a charge better than someone that unplugs in once it reaches 100%..
I personally would rather not deal with always worrying about over charging it and IF i still had the phone when the battery needs to be replaced, just replace it.
In the past 16 months i've had the Touch Pro, Palm Treo Pro, BB Bold & now the N1.. so i never have a phone long enough to even care lol.

I guess that's true. We can always replace the battery, unlike the Fruit people!
But I was just worried that the damage happened quickly. But I guess it's 9-12 months before seeing any real effects anyway.

scottypimpin636 said:
A new battery cost <$50 i'm sure... If you left your phone plugged in over night, every night for a year it probably won't hold a charge better than someone that unplugs in once it reaches 100%..
I personally would rather not deal with always worrying about over charging it and IF i still had the phone when the battery needs to be replaced, just replace it.
In the past 16 months i've had the Touch Pro, Palm Treo Pro, BB Bold & now the N1.. so i never have a phone long enough to even care lol.
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Actually, it's only $25 from Google.

uansari1 said:
Actually, it's only $25 from Google.
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Link?
I don't see an accessories page at www.google.com/phone
[Edit]: lol nevermind, you have to click "Get your phone" to get accessories haha

Paul22000 said:
Link?
I don't see an accessories page at www.google.com/phone
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Lol... click on the link you posted, click "Get Your Phone" and it's listed right below the Dock!

uansari1 said:
Lol... click on the link you posted, click "Get Your Phone" and it's listed right below the Dock!
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Yeah just saw that. Kind of silly to put it there since people looking for accessories already HAVE a phone. Silly Google

Oh, so by the way, this page brings up a good point:
http://www.google.com/support/android/bin/answer.py?hl=en&answer=175535
Charges at 480mA when installed in Nexus One phone connected to USB, at 980mA when installed in phone connected to charger
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Is there any difference in charging from USB vs AC adapter in terms of how it affects overall battery life?

How bad is overcharging?

Exactly how much worse would my battery get if I keep it plugged in the whole night(6~8hours)?
I tried to use my phone where I'll have it fully charged when I go to sleep so I plug it out. But sometimes my battery is at about 30% so I just charge it overnight.
How bad is this? Should I stop doing this?
Sent from my phone

the charging system WONT overcharge your battery.
it charges to 100%
turns off lets the phone use battery power to 95%
then charges again.
there is NO PHONE, NO CHARGER that would over charge its battery, that would just be self destruction.

Sweet, always wondered about that
Sent from my SAMSUNG-SGH-I897 using XDA App

:
Trusselo said:
the charging system WONT overcharge your battery.
it charges to 100%
turns off lets the phone use battery power to 95%
then charges again.
there is NO PHONE, NO CHARGER that would over charge its battery, that would just be self destruction.
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Click to collapse
Really? So it doesn't matter?
Anyone thanks
Sent from my phone

While it is impossible to overcharge your batter...not even sure what that means but the battery can not hold more charge then it is made to hold.
The only downside to leaving the phone on the charger overnight is that it will over time degrade the capacity of the battery. The way most modern phone batteries function they gradually loose capacity over time. This lose of capacity is accelerated the when the battery is at a greater charge level.

crystalhand said:
While it is impossible to overcharge your batter...not even sure what that means but the battery can not hold more charge then it is made to hold.
The only downside to leaving the phone on the charger overnight is that it will over time degrade the capacity of the battery. The way most modern phone batteries function they gradually loose capacity over time. This lose of capacity is accelerated the when the battery is at a greater charge level.
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I'm sorry..
My overcharging meant that I charge it for a long time.... sorry about that
Sent from my phone

Like Trusselo said, you can't overcharge it. There's a smart charger built in, that charges full and drops it back to extend battery life.
If you watch the supply with an ammeter, you'll see the current slowly decrease as it gets closer to full. Then when the "Battery is Full" notification appears, the current will immediately drop to 0 indicating that the charger has completed and it's running on battery. At that point it resets the stats to 100%. After it consumes about 5% (actually something like 4100mV) it will switch back to external power and only monitor the battery.

Oh strange. Nexus one does it different. When fully charged it runs off the AC current if still plugged in and battery remains charged

CuriousTech said:
Like Trusselo said, you can't overcharge it. There's a smart charger built in, that charges full and drops it back to extend battery life.
If you watch the supply with an ammeter, you'll see the current slowly decrease as it gets closer to full. Then when the "Battery is Full" notification appears, the current will immediately drop to 0 indicating that the charger has completed and it's running on battery. At that point it resets the stats to 100%. After it consumes about 5% (actually something like 4100mV) it will switch back to external power and only monitor the battery.
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So conclusion is
Charging it overnight will decrease my battery life so I shouldn't do it?
Sent from my phone

syl0n said:
Oh strange. Nexus one does it different. When fully charged it runs off the AC current if still plugged in and battery remains charged
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Interesting since that would be bad for the battery. What are your methods for determining this?

bluemoon1221 said:
So conclusion is
Charging it overnight will decrease my battery life so I shouldn't do it?
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Click to collapse
No. It's not charging overnight. The phone stops charging when it's full.
Sigh...
To get a better understanding of why your phone will never overcharge the battery go to youtube and type in "overcharging li-ion" or better "overcharging lipo" for some entertaining videos.

CuriousTech said:
No. It's not charging overnight. The phone stops charging when it's full.
Sigh...
To get a better understanding of why your phone will never overcharge the battery go to youtube and type in "overcharging li-ion" or better "overcharging lipo" for some entertaining videos.
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That's what I meant.... I'm saying will keeping it plugged in for 7 hours decrease my battery performance? .......
Sent from my phone

Okay then. I know these are lead, mercury and cadmium free but it might be too late.
You should do what gives you peace of mind, and be sure to read and follow all safety precautions for the products you own.

bluemoon1221 said:
That's what I meant.... I'm saying will keeping it plugged in for 7 hours decrease my battery performance? .......
Sent from my phone
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Click to collapse
NO!!!!!!!!!!!!
everyone is trying to tell you NO!!
keeping it charging over night will do NO dammage and will not hurt performance.

I've always wondered about this.. thanks!
Sent from my SAMSUNG-SGH-I897 using XDA Premium App

Trusselo said:
NO!!!!!!!!!!!!
everyone is trying to tell you NO!!
keeping it charging over night will do NO dammage and will not hurt performance.
Click to expand...
Click to collapse
Up in one of the reply by crystalhand
He said that it will degrade the capacity of the battery.??
Am I interpreting this the wrong way? Or is he wrong?
Sent from my phone

[Q] Charging the battery

hi!
i have a question regarding charing the battery. let's say the xperia z has something like 63% battery left. and i put it on the dock and let it charge up to 100% (or even less, e.g. 90%). and i do this quite often, will it some kind of "damage" or harm the battery, so that the battery life will decrease?
i mean the battery life doesn't seem to be that good, so i plan when coming home to put it on the dock, whether the battery is empty or not. and then when not used, leaving the phone on the doc.
thanks for your help & have a nice day

hebbe said:
hi!
i have a question regarding charing the battery. let's say the xperia z has something like 63% battery left. and i put it on the dock and let it charge up to 100% (or even less, e.g. 90%). and i do this quite often, will it some kind of "damage" or harm the battery, so that the battery life will decrease?
i mean the battery life doesn't seem to be that good, so i plan when coming home to put it on the dock, whether the battery is empty or not. and then when not used, leaving the phone on the doc.
thanks for your help & have a nice day
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I heard it's better than discharging to 0% and then charging it back to 100%. Not sure though

Al Gore said:
I heard it's better than discharging to 0% and then charging it back to 100%. Not sure though
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That was the case with old-style Nickel-Cadmium batteries, but no phone has used those in a long time. With modern Lithium-based batteries, regularly charging shouldn't be an issue.

Shasarak said:
That was the case with old-style Nickel-Cadmium batteries, but no phone has used those in a long time. With modern Lithium-based batteries, regularly charging shouldn't be an issue.
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thanks for all the answers.
so i can charge it as often and as long as i want, independent from its actual battery status? it won't lose power after time? even if i charge just from 70% to 75%?

hebbe said:
thanks for all the answers.
so i can charge it as often and as long as i want, independent from its actual battery status? it won't lose power after time? even if i charge just from 70% to 75%?
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It definitely will, my iPod is discharging quicker (at least it seems so) than a year ago when I bought it, and my current phone's battery (8 year old) can last like 20 minutes of talk time

hebbe said:
thanks for all the answers.
so i can charge it as often and as long as i want, independent from its actual battery status? it won't lose power after time? even if i charge just from 70% to 75%?
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It will lose power after time - all batteries do. You can charge it as long and as often as you want, it doesn't matter. If the battery loses its capacity - remember that Sony covered it under 24 months warranty and you'll get it replaced it its maximum capacity falls down under ~75% of its original capacity.

Akiainavas said:
It will lose power after time - all batteries do. You can charge it as long and as often as you want, it doesn't matter. If the battery loses its capacity - remember that Sony covered it under 24 months warranty and you'll get it replaced it its maximum capacity falls down under ~75% of its original capacity.
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Do they test it somehow or can I just go to Sony service center every 11 months and get a new battery?

Akiainavas said:
It will lose power after time - all batteries do. You can charge it as long and as often as you want, it doesn't matter. If the battery loses its capacity - remember that Sony covered it under 24 months warranty and you'll get it replaced it its maximum capacity falls down under ~75% of its original capacity.
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thanks.
but how do i determine if the capacity has fallen down under ~75%?

Al Gore said:
Do they test it somehow or can I just go to Sony service center every 11 months and get a new battery?
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hebbe said:
thanks.
but how do i determine if the capacity has fallen down under ~75%?
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There are free apps on the market that can assess your battery capacity. Of course if you're going to claim warranty - Sony will check it with more accurate methods, but even those free apps can measue your batterys's health quite accurately.
I'm not sure about the 75% number. Might be lower, might be higher. Usually it's set at 80% but i'd have to check that in the warranty itself ( will update the number when i get home )

Question Different charging patterns

If i use the official fast charger .....charge up to 100% the next day I barely get 16 hrs and 3 hrs screen time..wireless charge slowly and I get 30 percent more .
Anyone else see a difference??
Uk unlocked s21u for reference.

You sure there are no other factors involved?: types of apps you ran, heat, etc.

mattlcfc said:
If i use the official fast charger .....charge up to 100% the next day I barely get 16 hrs and 3 hrs screen time..wireless charge slowly and I get 30 percent more .
Anyone else see a difference??
Uk unlocked s21u for reference.
Click to expand...
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That sounds interesting! Would love to look into this a little deeper.
Could you describe this in a little more detail please? Like when do you start charging, how long it takes with each method, what your usage pattern is like, and what you mean by 30% more (SOT, Standgy, or literal battery percentage remaining)? And any relevant screeenshots would be much appreciated.

Fast charging will not engage if the temperature is too low. It will remain disengaged for that charge cycle.
Charging is an electrochemical reaction that needs a certain temperature range to function properly.
Minimum start temp is 72°F but 82-90F is optimal.
Anything below 72F brings the risk of Li plating which will permanently degrade the cell.
Charging will also shutdown if the battery temperature goes too high.

blackhawk said:
Fast charging will not engage if the temperature is too low. It will remain disengaged for that charge cycle.
Charging is an electrochemical reaction that needs a certain temperature range to function properly.
Minimum start temp is 72°F but 82-90F is optimal.
Anything below 72F brings the risk of Li plating which will permanently degrade the cell.
Charging will also shutdown if the battery temperature goes too high.
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I don't think OP is talking about speed of charging. We're trying to discuss battery life with different speeds of charging.

enigmaamit said:
I don't think OP is talking about speed of charging. We're trying to discuss battery life with different speeds of charging.
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It should be near identical.
Android battery capacity sensing always left something to be desired.
Battery temperatures should be made the same when comparing.
Try comparing battery voltages rather than indicated %

blackhawk said:
It should be near identical.
Android battery capacity sensing always left something to be desired.
Battery temperatures should be made the same when comparing.
Try comparing battery voltages rather than indicated %
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Click to collapse
That is why we're waiting for more information about his experience before coming to any conclusions.

enigmaamit said:
That is why we're waiting for more information about his experience before coming to any conclusions.
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Depending on how fast the battery is charging it may shutdown at a lower charge level to avoid overshooting the correct shutdown voltage.
Samsung is said to be very conservative with their charge curves... I wonder why
Samsung should be using graphene batteries by now. Instead of throwing all their resources at the Folds, which never have sold well, they neglect their bread winners. I just reamed them out over that today

blackhawk said:
I just reamed them out over that today
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You called them and asked them to switch to Graphene batteries?

nixnixnixnix4 said:
You called them and asked them to switch to Graphene batteries?
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Said they should be using them already, among other things. Before the 10+ was released there was speculation that it might have a Graphene cell, lol.
I was barely aware of this technology until a few days ago... it be cool and it's in use.

blackhawk said:
Said they should be using them already, among other things. Before the 10+ was released there was speculation that it might have a Graphene cell, lol.
I was barely aware of this technology until a few days ago... it be cool and it's in use.
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Other than power banks, who is using them in their phones?

nixnixnixnix4 said:
Other than power banks, who is using them in their phones?
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Xiaomi tells us about graphene batteries and the great challenge posed by the Mi 10 Ultra
Xiaomist A portal to share question and answer about smartphone , problems , news and ...
www.xiaomist.com

30% more seems to be a huge claim .
5%-10% could have been a margin or error.

I'll have to do some tracking and get some screen shots . I normally wireless charge overnight and it says 100 % every morning and I use 70 % battery on average . But 1 day a week I have to charge using the lead . I only have the "super fast" charger and lead and the next day the battery is always worse by quite a way . Dead by 19:00 hrs. Similar usage most days . Its as if on fast charge it says 100 % but is way down.
As said I'll do some more investigation.

mattlcfc said:
I'll have to do some tracking and get some screen shots . I normally wireless charge overnight and it says 100 % every morning and I use 70 % battery on average . But 1 day a week I have to charge using the lead . I only have the "super fast" charger and lead and the next day the battery is always worse by quite a way . Dead by 19:00 hrs. Similar usage most days . Its as if on fast charge it says 100 % but is way down.
As said I'll do some more investigation.
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You know that you can toggle OFF fast-charging and super-fast-charging in the battery settings right?
Try that.

blackhawk said:
Xiaomi tells us about graphene batteries and the great challenge posed by the Mi 10 Ultra
Xiaomist A portal to share question and answer about smartphone , problems , news and ...
www.xiaomist.com
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Samsung better listen then.
These batteries should last us 4 years easily. Anything less than that is a rip off.

nixnixnixnix4 said:
Samsung better listen then.
These batteries should last us 4 years easily. Anything less than that is a rip off.
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With heavy usage the Li's are good for 1-2 years. Maybe better in a temp controlled environment.
I stream a lot and that's hard on the battery which is why I now say... live and let die

It's typical for batteries to last longer the slower they're charged. If you're using fast charging when plugged in, you'll see a decrease in the amount of charge that is held throughout the day, compared to wireless charging which is quite a bit slower.

mattlcfc said:
If i use the official fast charger .....charge up to 100% the next day I barely get 16 hrs and 3 hrs screen time..wireless charge slowly and I get 30 percent more .
Anyone else see a difference??
Uk unlocked s21u for reference.
Click to expand...
Click to collapse
Are you sure there aren't any other elements at play? Examples include the applications you used, the temperature, and so on.

SuperIronOut said:
It's typical for batteries to last longer the slower they're charged. If you're using fast charging when plugged in, you'll see a decrease in the amount of charge that is held throughout the day, compared to wireless charging which is quite a bit slower.
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Click to collapse
So you're saying if one battery is slow, one is fast charged, both to 3.2 volts, the slow charged one will yield mAhs.
Unless the battery is degraded I have my doubts that it be a significant difference.

Is there a way to verify battery capacity to verify battery replacement?

With the announcement of the 1-year extended warranty, I went to go replace my battery today at ubreakifix. When I picked it up, the employee gave me the feeling they didn't actually work on my phone but billed Google for the work. Besides the fact that the things he said made me feel like they didn't actually work on it, I noticed when I picked it up the battery was within a few % of when I dropped it off. I'm trying to see if there's a way to check capacity or anything of that sort I can do to verify that my battery was or was not actually replaced.
I appreciate any help.

Your SOT should noticably longer.
New batteries typically have around a 50% charge on them.

blackhawk said:
Your SOT should noticably longer.
New batteries typically have around a 50% charge on them.
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Click to collapse
It was around 47% when I picked it up but I dropped it off at 53% which I thought was odd. That's good to know the range is correct for a new battery though. The guy was sketchy and made several comments that made me think he didn't actually touch it. I was hoping to check capacity or something to verify the change but I'll use it tomorrow and see how the battery life compares. If I'm still having battery issues, I just wanted to have concrete proof if I went back. He made a point to say "if it's still acting up then you'll just have to call Google and have the device replaced instead".

uoY_redruM said:
It was around 47% when I picked it up but I dropped it off at 53% which I thought was odd. That's good to know the range is correct for a new battery though. The guy was sketchy and made several comments that made me think he didn't actually touch it. I was hoping to check capacity or something to verify the change but I'll use it tomorrow and see how the battery life compares. If I'm still having battery issues, I just wanted to have concrete proof if I went back. He made a point to say "if it's still acting up then you'll just have to call Google and have the device replaced instead".
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I've seen a lot of bad techs. You could always take it to a 3rd party repair if it turns out the battery is still defective.
Maybe he's just shifty acting in appearance only.

blackhawk said:
I've seen a lot of bad techs. You could always take it to a 3rd party repair if it turns out the battery is still defective.
Maybe he's just shifty acting in appearance only.
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Yeah hopefully he was just awkward or something lol. I'll see how it plays out the next few days. Hopefully he replaced it. I plan on buying the Pixel 6 Pro but it would be nice for this to hold off until that comes out.

uoY_redruM said:
With the announcement of the 1-year extended warranty, I went to go replace my battery today at ubreakifix. When I picked it up, the employee gave me the feeling they didn't actually work on my phone but billed Google for the work. Besides the fact that the things he said made me feel like they didn't actually work on it, I noticed when I picked it up the battery was within a few % of when I dropped it off. I'm trying to see if there's a way to check capacity or anything of that sort I can do to verify that my battery was or was not actually replaced.
I appreciate any help.
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Click to collapse
You can use AccuBattery to check estimated battery capacity. You'll have to go through a few charge cycles to get an accurate estimation.

Lughnasadh said:
You can use AccuBattery to check estimated battery capacity. You'll have to go through a few charge cycles to get an accurate estimation.
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I might give that a try as well. I heard that just estimates but I guess that's better than not having any idea at all. I'm doing the first full charge since I got it so I'll download AccuBattery and run it the next couple days. Thanks for the suggestion.

uoY_redruM said:
I might give that a try as well. I heard that just estimates but I guess that's better than not having any idea at all. I'm doing the first full charge since I got it so I'll download AccuBattery and run it the next couple days. Thanks for the suggestion.
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It's total battery capacity estimates are not accurate. If you had been using it before it's SOT/% history would be useful.
I use it track my battery usage % vs SOT to spot misbehavior.
It's charging time/% history is also useful for monitoring charging. Erratic fast charging is one of the signs of a battery failure.

uoY_redruM said:
I might give that a try as well. I heard that just estimates but I guess that's better than not having any idea at all. I'm doing the first full charge since I got it so I'll download AccuBattery and run it the next couple days. Thanks for the suggestion.
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It's accurate enough to give you an idea if you got a new battery or not.

Lughnasadh said:
It's accurate enough to give you an idea if you got a new battery or not.
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It can be off quit a bit, 10% is typical.

blackhawk said:
It can be off quit a bit, 10% is typical.
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It can also be pretty accurate, in my experience.

Lughnasadh said:
It can also be pretty accurate, in my experience.
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It's history is but the actual mAh measurement isn't.
With no calibrated reference of the voltage to mAh ratio it can only do so much. I believe it's measuring voltage drop and calculating current and mAh from that instead of voltage×current.
Whatever the reason(s) it's absolute battery capacity isn't accurate.
I maybe mistaken but even though some power controller chips have current sensing capabilities, Android doesn't use that readout or make it available to any apks.
An Android shortcoming.
A Developer here maybe could or has shed light on this before.
Edit: some brands/models can apparently:
Measuring Device Power | Android Open Source Project
source.android.com
No information on Samsung models that I could easily find.

blackhawk said:
It's history is but the actual mAh measurement isn't.
With no calibrated reference of the voltage to mAh ratio it can only do so much. I believe it's measuring voltage drop and calculating current and mAh from that instead of voltage×current.
Whatever the reason(s) it's absolute battery capacity isn't accurate.
I maybe mistaken but even though some power controller chips have current sensing capabilities, Android doesn't use that readout or make it available to any apks.
An Android shortcoming.
A Developer here maybe could or has shed light on this before.
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Click to collapse
Like I said, I have found it accurate enough in my experience. New phone is around 100% estimated capacity. Year later, 90% or so. Year later 85% or so. Done this with several phones.
Not here to debate or argue about it. If the OP doesn't want to use it, they don't have to.

Lughnasadh said:
Like I said, I have found it accurate enough in my experience. New phone is around 100% estimated capacity. Year later, 90% or so. Year later 85% or so. Done this with several phones.
Not here to debate or argue about it. If the OP doesn't want to use it, they don't have to.
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That 10% is from the original OEM battery and the replacement. Android it's self lists it at 4100 when it should be 4300 new. Accubattery uses the Android figure unless you change that value.
He'll get a good enough idea if the phone last longer during usage. It should be a noticable improvement... and I hope it is.

blackhawk said:
That 10% is from the original OEM battery and the replacement. Android it's self lists it at 4100 when it should be 4300 new. Accubattery uses the Android figure unless you change that value.
He'll get a good enough idea if the phone last longer during usage. It should be a noticable improvement... and I hope it is.
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The battery capacity for this phone is 3,700. Like I said, I'm not here to argue or debate it. You do what you want and the OP will do what they want. So please stop quoting me. Let it go...

Lughnasadh said:
The battery capacity for this phone is 3,700. Like I said, I'm not here to argue or debate it. You do what you want and the OP will do what they want. So please stop quoting me. Let it go...
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Ok

blackhawk said:
He'll get a good enough idea if the phone last longer during usage. It should be a noticable improvement... and I hope it is.
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Just reporting back that it was definitely changed. I charged it before bed and decided not to put it in the charger over night to see what happened. I woke up and it was still at 99%.
It's been off the charger since 11pm yesterday, it's 8pm now and I still have 16%.

uoY_redruM said:
Just reporting back that it was definitely changed. I charged it before bed and decided not to put it in the charger over night to see what happened. I woke up and it was still at 99%.
It's been off the charger since 11pm yesterday, it's 8pm now and I still have 16%.
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Good deal
Guess the tech just has a guilty face

uoY_redruM said:
Just reporting back that it was definitely changed. I charged it before bed and decided not to put it in the charger over night to see what happened. I woke up and it was still at 99%.
It's been off the charger since 11pm yesterday, it's 8pm now and I still have 16%.
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Another way to check is with this online tool https://bathist.ef.lc/ Battery Historian. Make sure to charge your phone to full keep on the charger for a bit longer even after 100% If you can do it with the phone powered off that's even better. Turn the device back on take a bug report and upload it to the site. Then look for the "Coulomb charge" value and mouse over it. It will show you how much the device charged in Mah say for example you see 3650 then you divide it by the battery capacity for our device which is 3700. This means your battery health/capacity would be about 98.6%.

zetsumeikuro said:
Another way to check is with this online tool https://bathist.ef.lc/ Battery Historian. Make sure to charge your phone to full keep on the charger for a bit longer even after 100% If you can do it with the phone powered off that's even better. Turn the device back on take a bug report and upload it to the site. Then look for the "Coulomb charge" value and mouse over it. It will show you how much the device charged in Mah say for example you see 3650 then you divide it by the battery capacity for our device which is 3700. This means your battery health/capacity would be about 98.6%.
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Assuming that phone has accurate current sensing hardware and it's readout is available. All Androids report voltage relatively accurately... current not as much so.