Database Info

Useful Battery Information and Calibration

Here is some information that should be useful to everyone in one way or another if not then you should have told us your secret months ago. lol
A Li-ion batteries life is on a time clock from the day it's produced and how it is used, maintained and the number of cycles it goes through reduces it's life. Even when not being used at all the clock is ticking and life is shortening.
So if any of you are like me I know many of you are far worse than me when it comes to the amount of stress put through it with flashing and extreme general use. Hopefully this will shed some light for us as to what we can do to try and prolong the life of our batteries.
The majority of the following information is from the book “Batteries in a Portable World – A Handbook on Rechargeable Batteries for Non-Engineers” (2nd edition) and Battery University™
Special thanks to the books author and sponsor of Battery University™,
Isidor Buchmann
CEO and Founder, Cadex Electronics Inc.
How to Prolong the Life of Li-ion Batteries
Battery wear-down on lithium-based batteries is caused by two activities: actual usage or cycling, and aging. The wear-down effects by usage and aging apply to all batteries but this is more pronounced on lithium-based systems.
The Li-ion batteries prefer a shallow discharge. Partial discharges produce less wear than a full discharge and the capacity loss per cycle is reduced. A periodic full discharge is not required because the lithium-based battery has no memory. A full cycle constitutes a discharge to 3V/cell. When specifying the number of cycles a lithium-based battery can endure, manufacturers commonly use an 80 percent depth of discharge. This method resembles a reasonably accurate field simulation. It also achieves a higher cycle count than doing full discharges.
Simple Guidelines
Charge the Li-ion often, except before a long storage. Avoid repeated deep discharges.
Keep the Li-ion battery cool. Prevent storage in a hot car. Never freeze a battery.
Avoid purchasing spare Li-ion batteries for later use. Observe manufacturing date when purchasing. Do not buy old stock, even if sold at clearance prices.
Hints to long battery life
3.92V/cell is the best upper voltage threshold for cobalt-based lithium-ion. Charging batteries to this voltage level has been shown to double cycle life. Lithium-ion systems for defense applications make use of the lower voltage threshold. The negative is reduced capacity.
The charge current of Li-ion should be moderate (0.5C for cobalt-based lithium-ion).The lower charge current reduces the time in which the cell resides at 4.20V. It should be noted that a 0.5C charge only adds marginally to the charge time over 1C because the topping charge will be shorter. A high current charge tends to push the voltage up and forces it into the voltage limit prematurely.
Memory Myth or Fact?
Lithium batteries are not affected by memory, but the chemistry has its own peculiarities. Current inhibiting pacifier layers affect them through plate oxidation. This degenerative effect is non-correctable on a lithium-based system
Calibration
A more serious issue is maintenance requirements, better known as capacity re-learning. This procedure is needed on a regular basis to calibrate the battery.
Why is calibration needed?
The answer is in correcting the tracking errors that occur between the battery and the digital sensing circuit during use. The most ideal battery use, as far as fuel-gauge accuracy is concerned, is a full charge followed by a full discharge at a constant 1C rate. This ensures that the tracking error is less than one percent per cycle. However, a battery may be discharged for only a few minutes at a time and commonly at a lower C-rate than 1C. Worst of all, the load may be uneven and vary drastically. Eventually, the true capacity of the battery no longer synchronizes with the fuel gauge and "a full charge and discharge are needed to ‘re-learn’ or calibrate the battery."
How often is calibration needed?
The answer lies in the type of battery application. For practical purposes, a calibration is recommended once every three months or after every 40 short cycles.
What happens if the battery is not calibrated regularly? Can such a battery be used in confidence?
Such a battery is able to function normally, but the digital readout will be inaccurate. If not corrected, the fuel gauge information simply becomes a nuisance.
Just Tell Me WTF I Should Do!
Charge your battery as often as possible, partial discharges are actually better for your battery
Once your battery is charged to 100% avoid leaving it plugged in any longer if you are not using a OEM charger.
Your battery should never get hot from charging if it does this is a sign it may be damaged.
If fuel gauge starts acting up calibrate your battery.
Yeah but how the f^$% do I calibrate my battery?
Charge phone up and then delete your battery stats.
Unplug your phone from your wall charger and let your battery drain all the way down until phone shuts off.
While still off charge phone to 100% and then boot up as normal.
There is so much more that it's mind boggling but I think this covers the main parts and beyond for everyone. So far it appears that the bump method is not necessary nor are the numerous other steps.
I can only laugh when I think that the reason the method of calibration I was using was actually working is due to the fact that the "wipe batt stats, drain battery completely and charge to 100%" is basically the last step and all that is essentially needed.

3 hours? That's it? I thought whenever I charged from empty to full when it's off it's longer.. I should time it.. hmm

darkamikaze said:
3 hours? That's it? I thought whenever I charged from empty to full when it's off it's longer.. I should time it.. hmm
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I removed the time completely since some may vary. But the 3 hours is how long it should take to charge on a standalone battery charger. So rather than confuse or have questions it's better without it.

Nice work!
Charging a 1500mAh battery at 500mAh for example will take 3 hours. The Captivate charges at 2 levels though depending on if it's USB (500mAh max for charge + phone use) or a charger (whatever it says on the charger up to ~1200mAh) so it can probably get done in under 2 hours.
The phone charges to 4.23V and stops charging when full but continues to run on external power, and shuts down at 3.500V where it only consumes current to monitor the power button.
Just for reference.

Battery Stats
Since this is the first time i had a really good battery life. I would like to share it with everyone. Please see the attached screen shots.
I am using Darky's 9.1 with SuckerPunch's 1280/500 Kernel and TLJL3 modem.
I hope this will help anyone trying to get more battery life out of their Captivate.
Thanks,

CuriousTech said:
Nice work!
Charging a 1500mAh battery at 500mAh for example will take 3 hours. The Captivate charges at 2 levels though depending on if it's USB (500mAh max for charge + phone use) or a charger (whatever it says on the charger up to ~1200mAh) so it can probably get done in under 2 hours.
The phone charges to 4.23V and stops charging when full but continues to run on external power, and shuts down at 3.500V where it only consumes current to monitor the power button.
Just for reference.
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Thanks Curious appreciate it and thanks for the additional info.

I had some other random thoughts about the calibration because I keep seeing so many posts daily.
For example "I installed a new kernel 15 minutes ago, recalibrated and the battery drain is horrible." or "After a few charges it lasted longer."
I don't think people get the idea of calibration. Recalibrating determines the capacity of the battery to convert to a % full gauge. To do that you need to fully charge until the "Battery full. Unplug charger." notification, and not rely on the display and unplugging as soon as it hits 100%. That's the inaccurate display that you're trying to calibrate.
Think of it like having an opaque container and a teaspoon. You think the container can hold 100 teaspoons, so you stop filling at 100. All you can get out of it is 100 until you try to fill until it tops off and then count how many come back out.
The phone works the same way. It has an ammeter that monitors the charge current and drain current from the battery from the time you unplug it until it shuts off and remembers that total as the capacity. Unless it's recharged in the middle which voids the data.
After that full discharge, it should stay pretty accurate even with partial discharges. At least until the next rom/kernel flash which wipes it out. At that point (I assume) it uses a simple voltage level and some relative amps drawn to display the gauge, instead of the smarter method of keeping a constant value of mAh by adding when charging and subtracting when draining to know exaclty how full the battery is.

CuriousTech said:
Nice work!
Charging a 1500mAh battery at 500mAh for example will take 3 hours. The Captivate charges at 2 levels though depending on if it's USB (500mAh max for charge + phone use) or a charger (whatever it says on the charger up to ~1200mAh) so it can probably get done in under 2 hours.
The phone charges to 4.23V and stops charging when full but continues to run on external power, and shuts down at 3.500V where it only consumes current to monitor the power button.
Just for reference.
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hm. so if the phone switches to external power when the charge is full, is it okay to leave my phone plugged in once it's done charging? or is it just the fact that the battery is holding a full (4.2V) charge for a long time that's bad for its health?
in any case, useful post! i knew there were ways to preserve the life of li-ion batteries, but was never well-versed on the details.

Yes to both. Once the battery is fully charged, the charge circuit stops completely. It doesn't even need to trickle charge, so leaving it plugged in doesn't hurt anything.
Once the charge is complete the voltage isn't being held at 4.20V so it can come back down a little. I think BatteryUniversity generalizes becuase there have been many different designs over the years that weren't as good as what we have now, and some may have trickle charged their Li-Ions which shortens the life.

Which is it that wipes the battery stats, ROM or kernel? or is it both?

CuriousTech said:
Yes to both. Once the battery is fully charged, the charge circuit stops completely. It doesn't even need to trickle charge, so leaving it plugged in doesn't hurt anything.
Once the charge is complete the voltage isn't being held at 4.20V so it can come back down a little. I think BatteryUniversity generalizes becuase there have been many different designs over the years that weren't as good as what we have now, and some may have trickle charged their Li-Ions which shortens the life.
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One word of caution though is to ensure that you are using an OEM charger. Battery University recommends that you unplug once capacity is reached but perhaps this is a general statement for Li-ion batteries as you state.

zerkai said:
Which is it that wipes the battery stats, ROM or kernel? or is it both?
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Both. The first thing in a ROM flash script is to format all the partitions, so that means the batterstats.bin file is erased. When flashing a new kernel the file gets reset by some other means. No idea what. It could be CWM.

Yeah but how the f^$% do I calibrate my battery?
Charge phone up and then delete your battery stats.
Unplug your phone from your wall charger and let your battery drain all the way down until phone shuts off.
While still off charge phone to 100% and then boot up as normal.
My noob question is, how do you delete the battery stats?

iNFRiNGE said:
One word of caution though is to ensure that you are using an OEM charger. Battery University recommends that you unplug once capacity is reached but perhaps this is a general statement for Li-ion batteries as you state.
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What happens when you introduce the variable of occasional car charger use?

Sanctus Peregrinus said:
Yeah but how the f^$% do I calibrate my battery?
Charge phone up and then delete your battery stats.
Unplug your phone from your wall charger and let your battery drain all the way down until phone shuts off.
While still off charge phone to 100% and then boot up as normal.
My noob question is, how do you delete the battery stats?
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Click to collapse
the file is located at /data/system/batterystats.bin . you'll need a file browser with root access (i use root explorer, a paid app). make sure you mount the storage as read/write or you won't be able to delete the file.
after that, reboot your phone and it will rebuild the batterystats file.
***disclaimer: be careful doing this. if you delete a crucial file, you risk messing up or bricking your phone. such is life.

Nice write up with alot of interesting information. I have never calibrated my battery but will have to try it out. Thanks for posting.
Sent from my SAMSUNG-SGH-I897 using XDA App

I'm not positive of this, but I don't think batterystats.bin holds any battery capacity or health info. I was looking at BatteryManager and it looks like a database of processes and what they use only. But there is info somewhere that gets lost easily, which is the capacity and current amount consumed.
I've been skipping the delete of that file (using CWM) and have noticed that it recalibrates fine anyway. This coming from the point of dropping just after unplugging, which is a good indication that the info is gone.
It doesn't matter if you use a car charger, USB, or AC. The phone has the actual smart charger in it, the external connection is just the power supply. The chip inside regulates and monitors the charge.
So think of it this way. The charger knows when the battery is empty or full, and measures what goes in and comes out. So to know the capacity, it has to go from full to empty. That's really all there is to it. Just wait for the real "Battery full" before unplugging.

[Q] Erratic battery readings

Since installing Cognition, my Captivate's battery life has gotten steadily worse, and I'm reasonably sure that the calibration is off. As it is, even with 3G off, I still barely make it to the end of a regular day. Something's very wrong with the battery calibration. I did flash on a less-than-full battery, which is probably what caused the problem in the first place.
For example: A little while ago, I discharged the battery until the phone shut itself off. I was then able to restart from the same battery two more times (without charging), both times showing 3-4% remaining. The phone stayed on a reasonable amount of time with those charges, and shut itself off nicely when it read <1%.
Just now, i plugged it in, turned it on, and it immediately read 17%. It is now draining at a rapid speed, but it still has too much charge to truly be anywhere near empty. My multimeter reads 3.61v on the 3.7v battery, just for reference.
I recalibrated my battery just yesterday, but there is still a discrepancy between the percent when off and the percent when on. I don't believe I'm actually charging to 100% capacity or draining to 0.
Cutting to the chase: How do I completely zero-out my battery stats and actual charge at the same time for an accurate calibration?

Battery calibration that we follow here is strictly for the OS. Battery too has a chip in it that sends the readings to OS. Let ur battery do its charge-discharge cycles over a couple weeks, and see if its adjusted. Try not to delete ur battery stats again n again. Give both OS and battery to adjust to each other.

Jergling said:
Since installing Cognition, my Captivate's battery life has gotten steadily worse, and I'm reasonably sure that the calibration is off. As it is, even with 3G off, I still barely make it to the end of a regular day. Something's very wrong with the battery calibration. I did flash on a less-than-full battery, which is probably what caused the problem in the first place.
For example: A little while ago, I discharged the battery until the phone shut itself off. I was then able to restart from the same battery two more times (without charging), both times showing 3-4% remaining. The phone stayed on a reasonable amount of time with those charges, and shut itself off nicely when it read <1%.
Just now, i plugged it in, turned it on, and it immediately read 17%. It is now draining at a rapid speed, but it still has too much charge to truly be anywhere near empty. My multimeter reads 3.61v on the 3.7v battery, just for reference.
I recalibrated my battery just yesterday, but there is still a discrepancy between the percent when off and the percent when on. I don't believe I'm actually charging to 100% capacity or draining to 0.
Cutting to the chase: How do I completely zero-out my battery stats and actual charge at the same time for an accurate calibration?
Click to expand...
Click to collapse
If you are on the newest version of Cognition with DG's Cog kernel there is some trouble with it. DG knows about it and is working on a fix. You'd know that if you are reading the Cog thread.

ROM-specific posts should go in their matching sticky in the Q&A subforum. Had you looked in there you would have seen the battery issues with the current version and that DG is working on it.
A search of battery stats would also have answered your question about that aspect. SGSTools allows you to delete battery stats easily.

I guess it might have been faulty to assume that this is a general hardware problem, but I'm not using the newest build of Cog. I'll check my version and then read the release log in the thread l, then. In the meantime I'll go through a couple charge cycles before making any judgements.

Please post in the threads already opened.
On that note, thread closed

Battery issue. Help me?

I'm charging my tablet and I've noticed it never reaches full battery (100%). It hangs at 99% but then, if I unplug the cable, it shows 100%. 99% is shown again if I plug the cable back in. Also, when it's charging and the tablet is switched off, the bar never stops at full charge. The battery seems to run out faster too. Is there a way to recalibrate or to fix it? What has probably happened?
Sent from my GT-P3110 using XDA Premium HD app

Don't trust your battery display, its an liar. It cames strange, when your battery its discharging when its plugged in. So he must lie, to avoid massive failure message to the manufactures. I think with your battery its all ok.
You wake up, pulls the fully charged cell phone from the string and throws a quick glance in the e-mails. On the night was the smartphone loaded and the battery level indicator shows 100%. After a quick shower a customer wants to send an important file that you forgot the night before. Looking at the phone and determines that the battery is already down to 90%. A battery loss of 10% in 10 minutes? The phone must be broken!
A common criticism of today's smartphones is their short battery life compared to older phones. A few years ago it was quite possible that, after a week's holiday with still remaining battery life came back, if you forgot the charger (I do not happen more than once). In the newest phones on the market can however be lucky if you zurandekommt a weekend, without re-charging.
Basically, that's understandable. His time had phones a manageable list of functions: call and be called. Today one uses the device for e-mail, Web surfing, GPS navigation, photos, video games and a lot of other things. Earlier mobile phones had tiny displays, today they have gigantic screens with bright and vivid colors. All these features come at a price: a relatively high power consumption.
Interestingly, the underlying improvements in battery management problem of perception of the average user. Old cell phones put a pretty unelegantes charging behavior of the day: In general, you invited the battery up to the upper capacity limit and then switched to the mode "trickle charge" to ensure the highest level of battery charge. In this way they had in the short term always the best battery hurt, but the battery in the long run. The Battery University website that sets us apart precisely:
The period in which a battery at full charge should remain as short as possible, be kept. If high voltage will cause corrosion, especially at elevated temperatures.
And that is also the reason why "lose" many modern mobile phones up to 10% of their charge within a few minutes after they are sealed up from the charger. In truth, the batteries have been charged only for a brief moment to 100%. After that, the battery management has ensured that the unit discharges back to a level of about 90%. That the device was charged overnight, has no influence: The socket is only used to give a partial state of charge.
To investigate more closely, I Current widget installed on my HTC Droid Incredible. This app logs, is drawn as much electricity from the battery or the charger received. I have set the app so that it records every 10 seconds log data and data collected in this way a few days. Of course, depending on various factors (device hardware, firmware, kernel, etc), but the trends that I'm describing here to take on more and more mobile phones and are not limited to one device type or manufacturer.
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Xintorrim said:
I'm charging my tablet and I've noticed it never reaches full battery (100%). It hangs at 99% but then, if I unplug the cable, it shows 100%. 99% is shown again if I plug the cable back in. Also, when it's charging and the tablet is switched off, the bar never stops at full charge. The battery seems to run out faster too. Is there a way to recalibrate or to fix it? What has probably happened?
Sent from my GT-P3110 using XDA Premium HD app
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Click to collapse
I think your battery is all OK.
Modern batteries never load 100 %.

If you look at the battery charging current when state of charge is 99% ( for example with BMW app.) you will see that the charging current keeps at a higher level than 260mA.
This means that the ''leakage current'' of your battery is a little bit too high. This happen fairly frequently with Li-ion battery on all smarphones and tablets.
Do not warry, you will not loose any significant battery capacity if you stop the charging process at 99%.
You may see a typical current charging curve here: http://78michel.unblog.fr/samsung-galaxy-tab-2-10-1-tests/ ; the 100% limit was reached in this example.
I do not think that this ''high'' leakage current could be related to any battery failure.

Phone charging at 100% for around 15-30 minutes

Hello. I just noticed something weird on my TCL 10L phone. When the phone reaches 100%, it displays fully charged on my lockscreen. Though, unlocking the phone I see the phone is still charging. I see the battery bar being green with a charging bolt. It takes around 15-30 minutes until it says charged (and the bolt removed). Is this normal? I do not remember the phone doing this when I bought it around 5 months ago.

Changes in charging and especially sudden loss of capacity can indicate a battery failure.
Check for cover swelling/bulging, battery swelling is a failure, replace asap if so.
A failure this early is rare but Li's can fail at any time in their life.
Inspect jack and port for contamination. Use a known good charger and cable. Try cycling the battery until the phone shutdown then charge to 100%, repeat... to calibrate battery indicator.
Minimum start charging temp is 72F
Best start temperature is 82-90F
Never attempt to charge a Li below 40F
Keep battery temperature below about 101F when charging.
Do not use phone while charging as it will skew the charging curve.

Thanks for the reply. There is no battery loss. I can play games on this device, browse, and check apps and drain the battery in the same period I did since I got it. I actually charged it to 100% since went to sleep. 9 hours later the device was still at 100%. 1.5 hour of playing a game after that and the battery was down to 84%. The issue is really weird. I am thinking a battery calibration may help. I do not know.
P.S. I am currently using Android 10 and I do not want to switch to Android 11.

I wouldn't worry about it.
It's best not to charge to 100%.or below 30%.
Lu's like frequent midrange power cycling (40-65%).
As for 11, no way that crapware is getting on my phones....

blackhawk said:
I wouldn't worry about it.
It's best not to charge to 100%.or below 30%.
Lu's like frequent midrange power cycling (40-65%).
As for 11, no way that crapware is getting on my phones....
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Did you personally experience this on any device? This is the first time I saw something like this. According to some articles the phone may display wrong battery stats. So I was thinking calibration would be a solution to this issue.

Fast battery drain from an year old device. Is there any way to slow charging speed?

So my 4a has been having fast battery drain since few months now. I remember it having very good battery life initially. However now it drains battery very fast.
This is also surprising since I keep brightness low due to me being sensitive to it.. and also keep the phone charged upto 80% capacity only as I read that it prolongs battery life.
One thing I could note is that the phone drains slower in the 80 - 100 % range if the phone gets fully charged occasionally.
Hence I have been suspecting the 'rapid' charging which is enabled by default on stock charger to be one cause.
Is there some way to enable slower charging like what happens in case of 'Adaptive charging' post 80% capacity? I hope that will lead to lesser wearing down of battery.

Don't use a compatible cable/charger and it'll change slowly. I don't think any PC I've connected to can do rapid charging, for example, and the cheap USB chargers I have definitely can't do it, only the one that came with the phone can do it.

purezen said:
So my 4a has been having fast battery drain since few months now. I remember it having very good battery life initially. However now it drains battery very fast.
This is also surprising since I keep brightness low due to me being sensitive to it.. and also keep the phone charged upto 80% capacity only as I read that it prolongs battery life.
One thing I could note is that the phone drains slower in the 80 - 100 % range if the phone gets fully charged occasionally.
Hence I have been suspecting the 'rapid' charging which is enabled by default on stock charger to be one cause.
Is there some way to enable slower charging like what happens in case of 'Adaptive charging' post 80% capacity? I hope that will lead to lesser wearing down of battery.
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It's more likely an app that drain your battery in background than your battery dying already. Quick charge and adaptive charge are made to not harm the battery.
Are you rooted? If yes, install Franco kernel manager app from playstore.
In first page you'll see your battery life estimation (from system) and clicking on live monitor go-to the processes tab.
Just like top cmd on Linux you'll see which process is active and how much cpu it use
For me as an exemple i realized that when I'm using YouTube music. The AdAway app goes crazy and drain my battery. And its something that's not shown on settings/battety tab.

Fast charging stresses the battery more than slow charging. That said I almost always fast charge. I expect 1-2 years of battery life on my N10+'s though.
Charging past 80% or discharging below 30% stresses the battery; Li's like frequent midrange power cycling.
Don't start charging below 72F, 82F or higher is best. High temp cut off is about 102F.
Never attempt to charge a battery colder than 40F!!!
Erratic fast charging is a sign of battery failure.
A rapid decline in capacity is another sign of a battery failure.
Any rear cover bulging ie battery swelling is a failure, replace asap.
Once a battery is below 80% of it's original capacity it's degraded and has reached the end of its service life, replace it.
Degraded Li's are more likely to fail which can easily destroy the phone.
If the phone is used heavily or is 2-3 years old, probably time to replace the battery. Just do it.
On most phones the cost is low.

a1291762 said:
Don't use a compatible cable/charger and it'll change slowly. I don't think any PC I've connected to can do rapid charging, for example, and the cheap USB chargers I have definitely can't do it, only the one that came with the phone can do it.
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Mine does rapid one only Thankfully connecting a usb to a socket board does non-rapid

Dead-neM said:
It's more likely an app that drain your battery in background than your battery dying already. Quick charge and adaptive charge are made to not harm the battery.
Are you rooted? If yes, install Franco kernel manager app from playstore.
In first page you'll see your battery life estimation (from system) and clicking on live monitor go-to the processes tab.
Just like top cmd on Linux you'll see which process is active and how much cpu it use
For me as an exemple i realized that when I'm using YouTube music. The AdAway app goes crazy and drain my battery. And its something that's not shown on settings/battety tab.
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Thanks for the response
Frankly don't have that much usage of my phone. Will give sometime to observing with non rapid charging. Will give this a try if that still persists.

blackhawk said:
Fast charging stresses the battery more than slow charging. That said I almost always fast charge. I expect 1-2 years of battery life on my N10+'s though.
Charging past 80% or discharging below 30% stresses the battery; Li's like frequent midrange power cycling.
Don't start charging below 72F, 82F or higher is best. High temp cut off is about 102F.
Never attempt to charge a battery colder than 40F!!!
Erratic fast charging is a sign of battery failure.
A rapid decline in capacity is another sign of a battery failure.
Any rear cover bulging ie battery swelling is a failure, replace asap.
Once a battery is below 80% of it's original capacity it's degraded and has reached the end of its service life, replace it.
Degraded Li's are more likely to fail which can easily destroy the phone.
If the phone is used heavily or is 2-3 years old, probably time to replace the battery. Just do it.
On most phones the cost is low.
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Thanks for the response. That was insightful

UPDATE:
Started slow-er charging since few days now.. and I really feel that the battery performance has considerably improved
Also update to Android 12 since few days as well so not sure if that has a role to play though I don't think so

purezen said:
UPDATE:
Started slow-er charging since few days now.. and I really feel that the battery performance has considerably improved
Also update to Android 12 since few days as well so not sure if that has a role to play though I don't think so
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If it seems to work better... I don't see any difference on my N10+'s though. Run times are the same slow/fast charging.
Keep a close eye on it as erratic fast charging is a sign of battery failure... I have seen that