Battery Calibration Debunked (By Actual Google Android Dev) - myTouch 4G General

Dianne Hackborn - 6:42 PM - Public Today's myth debunking:
"The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/directory."
No, it does not.
This file is used to maintain, across reboots, low-level data about the kinds of operations the device and your apps are doing between battery changes. That is, it is solely used to compute the blame for battery usage shown in the "Battery Use" UI in settings.
That is, it has deeply significant things like "app X held a wake lock for 2 minutes" and "the screen was on at 60% brightness for 10 minutes."
It has no impact on the current battery level shown to you.
It has no impact on your battery life.
Deleting it is not going to do anything to make your more device more fantastic and wonderful... well, unless you have some deep hatred for seeing anything shown in the battery usage UI. And anyway, it is reset every time you unplug from power with a relatively full charge (thus why the battery usage UI data resets at that point), so this would be a much easier way to make it for away.
Source:
https://plus.google.com/u/0/105051985738280261832/posts/FV3LVtdVxPT

Finally.
Sent from my HTC Sensation 4G using XDA App

nice find. guess the perceived improvement in battery accuracy/life is all placebo

mrmako777 said:
nice find. guess the perceived improvement in battery accuracy/life is all placebo
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Click to collapse
Yes, like so many other things...

mrmako777 said:
nice find. guess the perceived improvement in battery accuracy/life is all placebo
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Click to collapse
Is that what wipe battery stats does? I have never noticed any difference when I did that. To think of all the times I have run the battery down, cleared the stats, charged it, and cleared the stats again with no noticeable results.
Sometimes it seems like the battery life gets thrown off by flashing a new rom. It isn't necessarily getting worse battery life but the indicator will work funny like it will show 99% for 3 hours and I will think I am getting great battery life and then go to 30 in the next 20 minutes. It is like the UI gets confused. My tablet will sometimes say "connect your charger" even though the battery and indicator are 100%.
I don't think people realize how much drain the display is on the battery. They flash a cool rom and use it a lot and then think they are getting bad battery life because the display has been on for two hours while they play with it. It is amazing the amount of difference I get between when I am fidgeting with my phone while I am at work (have to recharge during the day) and when I am at home on the weekend and it sits on the kitchen table most of the time (it will generally go all weekend without a charge).

Wonder why its even an option to wipe battery stats with apps or recovery if it doesnt do anything. I never saw a difference myself, I just wiped them periodically cause others seemed to think it made a difference.

Always worked for me. Been flashing since g1 days. whatever
Sent from my HTC Glacier using xda premium

jayb222 said:
Always worked for me. Been flashing since g1 days. whatever
Sent from my HTC Glacier using xda premium
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Ya well she helped make the original rom for your g1 so she must be wrong. The thickness of some peoples head
Sent from my Galaxy Nexus

mark manning said:
Ya well she helped make the original rom for your g1 so she must be wrong. The thickness of some peoples head
Sent from my Galaxy Nexus
Click to expand...
Click to collapse
+1 lol
Sent from my HTC Glacier using xda premium

First of all those of us who actually knows about Android OS really knows that /data/system/batterystats.bin is nothing more than stats audit. Now if you think you can't actually re-calibrate battery and project that data than your a fool. It has nothing to do with that file.
First of all to accurately predicate it you need a true daemon that's capable of tracking system data with full autonomy access. Second you need correct battery specs from the manufacturer. As reading memory from it may or not even be supported by the device kernel if its not allocated. Thus you see issues with cross link batteries on stock roms, but some is exceptional with similar size, specs.
Now to project the correct data from ~1-100% you need to fully discharge for it to cycle. Yes I know some of you maybe saying never fully discharge Li-Io but if you know the min mV rating then you can stop near suggested mV as it won't go below and damage cells. From then the duration of full charge is defined along with total available mAh. By calculating discharged -mA draw pre scale unit over empty estimation you can predict the true battery percentage.
Ex: ATM my uptime is 14h 47m at 65% with moderate usage (talk, txt, web). Since I have MP1650mAh battery I'm currently at 1072mAh. As its drawing -90mA per scale unit with 4156mV. At this current rate fully projected empty estimation is 9h 38m. Keep in mind my deviceis highly optimized and is on very aggressive battery saving mode.
Sent from my HTC Glacier

HTC Glacier said:
First of all those of us who actually knows about Android OS really knows that /data/system/batterystats.bin is nothing more than stats audit. Now if you think you can't actually re-calibrate battery and project that data than your a fool. It has nothing to do with that file.
First of all to accurately predicate it you need a true daemon that's capable of tracking system data with full autonomy access. Second you need correct battery specs from the manufacturer. As reading memory from it may or not even be supported by the device kernel if its not allocated. Thus you see issues with cross link batteries on stock roms, but some is exceptional with similar size, specs.
Now to project the correct data from ~1-100% you need to fully discharge for it to cycle. Yes I know some of you maybe saying never fully discharge Li-Io but if you know the min mV rating then you can stop near suggested mV as it won't go below and damage cells. From then the duration of full charge is defined along with total available mAh. By calculating discharged -mA draw pre scale unit over empty estimation you can predict the true battery percentage.
Ex: ATM my uptime is 14h 47m at 65% with moderate usage (talk, txt, web). Since I have MP1650mAh battery I'm currently at 1072mAh. As its drawing -90mA per scale unit with 4156mV. At this current rate fully projected empty estimation is 9h 38m. Keep in mind my deviceis highly optimized and is on very aggressive battery saving mode.
Sent from my HTC Glacier
Click to expand...
Click to collapse
http://batteryuniversity.com/learn/article/how_to_prime_batteries
The truth is out there
Sent from my Galaxy Nexus

mark manning said:
http://batteryuniversity.com/learn/article/how_to_prime_batteries
The truth is out there
Sent from my Galaxy Nexus
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And that is why you don't allow fools to use Google. Do you actually understand or comprehend what was said? Let me ask you this why do you think they "wipe batterystats"? What's the reason for it? lol he thinks you can't predict actual mV/mAh of battery based on mA draw lol now that isfunny. The whole reason of having any UI battery metter was based on what logic? Next time you Google.com something make sure you actually comprehend what was the logic behind it. Hey all THE truth is out there...
Sent from my HTC Glacier

HTC Glacier said:
And that is why you don't allow fools to use Google. Do you actually understand or comprehend what was said? Let me ask you this why do you think they "wipe batterystats"? What's the reason for it? lol he thinks you can't predict actual mV/mAh of battery based on mA draw lol now that isfunny. The whole reason of having any UI battery metter was based on what logic? Next time you Google.com something make sure you actually comprehend what was the logic behind it. Hey all THE truth is out there...
Sent from my HTC Glacier
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The sad part was I was backing up on what you said. Calm down read it in lame mans terms before you trip.
Sent from my Galaxy Nexus

Man, its getting hot in here. Lol.
Ok, so, if wiping battery stats is useless because it does NOTHING to the battery, is there a way to address the battery and force it to allow a slight overcharge on a regular basis, thereby shutting charging off at a higher capacity?
Please forgive my ignorance gentleman, and refrain from verbally bashing me.
I bought a 1550 mAh Anker battery. If I charge it to 100% and then use it, it stays at 100% for hours. Is this because my phone is waiting for it to drop below 1400 mAh, or what? If that's the case can I somehow tell my phone to consider 1550 mAh 100%?
I ask because of the mugen power app on the market. It intrigued me. Though there is a chance its a bunch.of balogna.
Sent from my HTC Glacier using XDA App

mark manning said:
The sad part was I was backing up on what you said. Calm down read it in lame mans terms before you trip.
Sent from my Galaxy Nexus
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sorry I knew that was another possibility, my mistake. I thought the link you posted some how undermines what I said as you quoted me. As I only posted how to accurately predict and report battery data. Also I think you know who I am...
estallings15 said:
Man, its getting hot in here. Lol.
Ok, so, if wiping battery stats is useless because it does NOTHING to the battery, is there a way to address the battery and force it to allow a slight overcharge on a regular basis, thereby shutting charging off at a higher capacity?
Please forgive my ignorance gentleman, and refrain from verbally bashing me.
I bought a 1550 mAh Anker battery. If I charge it to 100% and then use it, it stays at 100% for hours. Is this because my phone is waiting for it to drop below 1400 mAh, or what? If that's the case can I somehow tell my phone to consider 1550 mAh 100%?
I ask because of the mugen power app on the market. It intrigued me. Though there is a chance its a bunch.of balogna.
Sent from my HTC Glacier using XDA App
Click to expand...
Click to collapse
That is THE prime reason people "wipe batterystats.bin" thinking it would fix staying for hours at 100% delay and heavy drop in short time. Which is sign of missing true data. Normally its measured via min/max mV and available mAh. Now by subtracting the used mA per scale unit the empty estimation is calculated. Thus projecting power draw at given duration and near accurate battery metter.
Sent from my HTC Glacier

HTC Glacier said:
sorry I knew that was another possibility, my mistake. I thought the link you posted some how undermines what I said as you quoted me. As I only posted how to accurately predict and report battery data. Also I think you know who I am...
That is THE prime reason people "wipe batterystats.bin" thinking it would fix staying for hours at 100% delay and heavy drop in short time. Which is sign of missing true data. Normally its measured via min/max mV and available mAh. Now by subtracting the used mA per scale unit the empty estimation is calculated. Thus projecting power draw at given duration and near accurate battery metter.
Sent from my HTC Glacier
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kinda wondered if that was you, didnt have your typical avatar tho
Sent from my Galaxy Nexus

So with this being said then you don't have to worry about your battery percentage between flashing roms?
The battery life should be still accurate?
I have a 1700mah
Sent from my HTC Glacier using xda premium

HTC Glacier said:
That is THE prime reason people "wipe batterystats.bin" thinking it would fix staying for hours at 100% delay and heavy drop in short time. Which is sign of missing true data. Normally its measured via min/max mV and available mAh. Now by subtracting the used mA per scale unit the empty estimation is calculated. Thus projecting power draw at given duration and near accurate battery metter.
Sent from my HTC Glacier
Click to expand...
Click to collapse
Yes, of course it is the prime reason. My question was, is there a way to tell the phone that 1550 is 100% or do I just deal with inaccurate monitoring that is based on a 1400 mAh battery?
Or, alternatively, will android figure it out over time and adjust for me?
Sent from my HTC Glacier using XDA App

answer me this: why in miui does the hardware led light up green when miui tells me im only at 90%? when i check the mv with the battery calibration app it tells me im at 4220 which is a full charge...what makes miui not see that the battery is full?

Before battery calibration, regardless of what happens, I was getting 9 hours, light usage. After battery calibration I get 19 hours, medium use. I'll stick with it with my thick headed self.
Sent from my HTC Glacier using xda premium

Related

Poor Battery Life on NS?

I'm going to try to purchase my Nexus S before class tomorrow when they open. Don't want to take any chances on it selling out. Would it be wise to turn it on and use it a while during the morning? Or does the battery need to be fully charged before using it to condition it and ensure a good battery life? I've read many battery tips but i'm still a little confused on whats better for a new battery.
CaliLove310 said:
I'm going to try to purchase my Nexus S before class tomorrow when they open. Don't want to take any chances on it selling out. Would it be wise to turn it on and use it a while during the morning? Or does the battery need to be fully charged before using it to condition it and ensure a good battery life? I've read many battery tips but i'm still a little confused on whats better for a new battery.
Click to expand...
Click to collapse
When you get it, deplete it, but do not let it die. Ever. Then just cycle it normally.
zachthemaster said:
When you get it, deplete it, but do not let it die. Ever. Then just cycle it normally.
Click to expand...
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What do you mean by "die".... like to 0%, if so what should we take it down to?
azn2050 said:
What do you mean by "die".... like to 0%, if so what should we take it down to?
Click to expand...
Click to collapse
Yes, by letting your battery "die", per se, you're letting it deplete to 0%. I'd say for safe measure, between 5%-9%. But if you're in the vicinity of a charger take it down to 2%. If not, turn it off at 5%, then plug it in before powering it back on. My devices' daily life lasts so long (on all devices I own) because I properly know how to cycle a battery.
If you let your battery die (0%), it'll lose more and more charge (on a 0.00% level) every time. When you get it tomorrow though, it should have ~50%-60% charge.
CaliLove310 said:
I'm going to try to purchase my Nexus S before class tomorrow when they open. Don't want to take any chances on it selling out. Would it be wise to turn it on and use it a while during the morning? Or does the battery need to be fully charged before using it to condition it and ensure a good battery life? I've read many battery tips but i'm still a little confused on whats better for a new battery.
Click to expand...
Click to collapse
There's no need for that, only if it doesn't have any juice.
More info: batteryuniversity dot com
Battery life?
So how are your batteries doing? Mine is kind of crappy. What supposedly changed in 2.3? I see no difference in the reporting of apps in Battery Use and they took away Battery History in the hidden system settings. Where is the graph everyone talked about?
You gotta give it a few charging cycles for the battery to reach it's full potential. Give its few days, you'll notice it will get better after you charged it a few times.
Sent from my Nexus S using XDA App
The battery life on mine is chugging along pretty well. I gave it a full charge before hitting the streets. Its been 4 hours with wifi and GPS on with a couple dozen pictures taken and a bunch of apps dl and installed. used maps 5.0 and periodically hit the GPS for my position getting really good accuracy while driving and the battery level still has a little more than 4/5s battery life still remaining
Sent from my Nexus S using XDA App
hah2110 said:
So how are your batteries doing? Mine is kind of crappy. What supposedly changed in 2.3? I see no difference in the reporting of apps in Battery Use and they took away Battery History in the hidden system settings. Where is the graph everyone talked about?
Click to expand...
Click to collapse
You haven't broken it in yet, use your brain.
The phones barely been out that long, it takes a while to have good statistics about battery life.
Myth on lion
rashad1 said:
You haven't broken it in yet, use your brain.
Click to expand...
Click to collapse
Sent from my Nexus S using XDA App
I haven't even reached the full 100% charge yet, been using it then charging it some then using it then charging it some. Lol
hah2110 said:
So how are your batteries doing? Mine is kind of crappy. What supposedly changed in 2.3? I see no difference in the reporting of apps in Battery Use and they took away Battery History in the hidden system settings. Where is the graph everyone talked about?
Click to expand...
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hah2110 said:
Myth on lion
Sent from my Nexus S using XDA App
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That's funny because every company that sells back up batteries tell you to go through 4-5 full cycles before it reaches its potential. I guess you're right, and they're all wrong.
They are wrong. Google it
Sent from my Nexus S using XDA App
Battery
how do I train my battery it was halfway charged when i got it do I let it die and then put it on the charger thanks!
EDIT:WRONG SECTION DELETE THIS MODS!
I've always charged all the way up then ran the battery all the way down, then charged all the way up again. Then periodically, I will run the battery all the way down just to give it a little exercise. So far out of all the cell phones I have had I have had 1 battery go bad on me, that was 8-10years ago.
Battery
how do I train my battery it was halfway charged when i got it do I let it die and then put it on the charger thanks!
matter of opinion really.... I would kill it by playing with it.... then do a full charge
that is what I am doing
Generally the suggested method is to charge it for 8-12 hours as soon as you can, then use it until it gets very low, then charge for another 8-12 hours. Do this cycle about 3 to 4 times and you've got yourself a healthy battery.
Killing the battery entirely, despite popular belief, can have some negative effects on its health. Especially during is conditioning phase.

Battery overheating issue? Read

I'm posting this for informative purposes. This is not to ***** about anything or prove anyone wrong. These are simply my findings and my conclusion. I was a sales person for wireless carriers for 8 years and saw this stuff a lot and I would stress test phones before swapping because I hated giving people refurbished crap for them to come back and complain about the same overheat issue. This experience led me to think before doing a device swap.
my G2x battery got hot from day one. From my monitoring I noticed the following.
1. The phone itself was not really hot. Just general radiation from the immediate battery area and it cooled off quickly after battery removal while battery would stay hot for a good 15-20 minutes.
2. Battery temp would hit 106 degrees.
3. Battery life just plain sucked. Charging it 2 to 3 times a day on light use.
T-mobile replaced my battery and after one full day of on and off abuse running 6 quadrants in a row at Max overclock amongst other things and with a thick non breathable case in the back the temp never got over 99 degrees. Prior to swap just reading and posting on xda would spike temps and that was with no case.
So before you decide to do anything pay close attention to what exactly is getting hot. Is the actual device hot or is it just the battery. Is the device a tad warmer simply due to the battery being too hot? Get a battery monitor installed to see the temp. Check your settings such as overclocking undervoltage etc.
T-Mobile just wanted to swap everything but since my phone was not hot and I had a good screen and never a boot or reboot issue even before root and bloat installed etc so I didn't want to take a chance and get a **** device. They also told me it was OK that k needed to charge it 3 times a day. I said with triple the usage on my G2 I almost never needed to charge it at all mid day. While each device varies, one third the battery life on one third the usage is simply not right no matter how you look at it.
So I say pay attention to detail before returning your device especially if your device is a good one because it would suck to get a **** device in exchange for your good one just because of a battery.
EDIT. I do want to add that my battery has spiked to 103.8 degrees while basically doing CPU intensive stuff While charging the entire time. When not on the charger it did not spike as high. After a short time after charge hit 100% it dropped over 1.5 degrees pretty quickly.
G2x with faux AOSP
The fact that you wrote "a lot" instead of "alot" showed me your post was worth reading.
Sent from my SGH-T959 using XDA App
stefan.buddle said:
The fact that you wrote "a lot" instead of "alot" showed me your post was worth reading.
Sent from my SGH-T959 using XDA App
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Click to collapse
What? Really? Lol thanks for the info! I've noticed my battery getting hella hot when using navigation and a car charger. I could barely even hold the thing...
Sent from my LG-P999 using XDA App
crx4xharder said:
What? Really? Lol thanks for the info! I've noticed my battery getting hella hot when using navigation and a car charger. I could barely even hold the thing...
Sent from my LG-P999 using XDA App
Click to expand...
Click to collapse
OEM car charger or some wallywolrd special?
G2x with faux AOSP
stefan.buddle said:
The fact that you wrote "a lot" instead of "alot" showed me your post was worth reading.
Sent from my SGH-T959 using XDA App
Click to expand...
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The fact that you wrote that leads me to believe you miss a lot of really important information because someone wrote "alot" as opposed to "a lot". Someone who writes "alot" isn't worth your time or energy?

HTC Evo 3D Battery confirmed and working

Hello everyone, confirmed the HTC EVO 3D battery works in the Sensation, the shell is exactly the same with writing on opposite sides. I also included the approximate difference in the batteries using BatteryTime Pro. Hope this helps someone with an alternate battery decision.
nice one...just flip it over and go? nice find...ill have to grab one now
poopymt3g said:
nice one...just flip it over and go? nice find...ill have to grab one now
Click to expand...
Click to collapse
That's it!
Tacjim said:
That's it!
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Click to collapse
Nice! Where did you get the battery from? Online?
graffixnyc said:
Nice! Where did you get the battery from? Online?
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Yes I got it at HTCPedia shop, I'm to new here, it won't allow me to post links. It's 29.99, just type HTC Evo 3d battery in the search function.
Think I'll probably get one. Why not?
does the extra .1v affect it?
nicky041192 said:
does the extra .1v affect it?
Click to expand...
Click to collapse
No, It doesn't affect the phone at all...correct me if I'm wrong, the Nominal Voltage is 3.6v for the standard battery which charges at 4.2 volts. The operating voltage is 4.2v (fully charged) and 2.8v (discharged) That being said, your .1v makes no difference to the phone!
Does anyone have a good source to get these cheap?
that app looks awesome. how accurate is it in terms of all the usage stats it shows?
xnifex said:
that app looks awesome. how accurate is it in terms of all the usage stats it shows?
Click to expand...
Click to collapse
I needed something on my screen that shows the percentage of battery remaining, I used it with my Nexus One, it works quite well with the Sensation too. With the Sensation you have to put in the battery mAh when changing batteries. How accurate is it? If you look at the screen shot above with the standard battery it show's 8:35 hours of talk time, if you look at the specs of the HTC Sensation at the HTC site, it show's up to 500 minutes which is 8.33 hours. I looked up the talk time on the EVO 3D and it st states 560 minutes or 9.33 hours, considering the Sensation might be a little more efficient, 9:46 hours might be spot on!
Tacjim said:
I needed something on my screen that shows the percentage of battery remaining, I used it with my Nexus One, it works quite well with the Sensation too. With the Sensation you have to put in the battery mAh when changing batteries. How accurate is it? If you look at the screen shot above with the standard battery it show's 8:35 hours of talk time, if you look at the specs of the HTC Sensation at the HTC site, it show's up to 500 minutes which is 8.33 hours. I looked up the talk time on the EVO 3D and it st states 560 minutes or 9.33 hours, considering the Sensation might be a little more efficient, 9:46 hours might be spot on!
Click to expand...
Click to collapse
ok I'll rephrase the question: those usage times, are they showing what you actually have or is it showing you estimated times that you could have based on battery percentage?
xnifex said:
ok I'll rephrase the question: those usage times, are they showing what you actually have or is it showing you estimated times that you could have based on battery percentage?
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Click to collapse
I can't say yes or no..I've never been on the phone 9 hours, internet for 6 ect..ect..I can say that my phone really uses no power when it's on standby. I might throw on a couple of netflix movies to see how many I can view.
Tacjim said:
I can't say yes or no..I've never been on the phone 9 hours, internet for 6 ect..ect..I can say that my phone really uses no power when it's on standby. I might throw on a couple of netflix movies to see how many I can view.
Click to expand...
Click to collapse
Netflix will do the trick. I used it last night to drain my Anker battery. It was at like 35% & took 45 minutes of streaming over data to kill it. Great way to get that first discharge out before you finally charge it up to 100%
Tacjim said:
you have to put in the battery mAh when changing batteries
Click to expand...
Click to collapse
I'm going to be devil's advocate for a minute. There's no way to tell the capacity of a battery by taking a snapshot of its current state. If you are telling the app what the mAh is and the battery is charged to 100% then it's making a calculation based on what you told it. It's not actually measuring the true capacity. The only way to determine the capacity of a battery is to fully charge it, then fully discharge it through a load and measure the current. There are no shortcuts, or apps that can do this instantaneously.
As indicated in several other threads the mAh stamped on 3rd party batteries are very unreliable. If you buy a real HTC EVO 3D battery then I'll say it's probable that the mAh is close to the rating, and your test would indicate you may well get more run time on the Sensation. If you buy some other battery then YMMV.
It is good to know that EVO 3D batteries will fit though. Thanks.
samnada said:
I'm going to be devil's advocate for a minute. There's no way to tell the capacity of a battery by taking a snapshot of its current state. If you are telling the app what the mAh is and the battery is charged to 100% then it's making a calculation based on what you told it. It's not actually measuring the true capacity. The only way to determine the capacity of a battery is to fully charge it, then fully discharge it through a load and measure the current. There are no shortcuts, or apps that can do this instantaneously.
As indicated in several other threads the mAh stamped on 3rd party batteries are very unreliable. If you buy a real HTC EVO 3D battery then I'll say it's probable that the mAh is close to the rating, and your test would indicate you may well get more run time on the Sensation. If you buy some other battery then YMMV.
It is good to know that EVO 3D batteries will fit though. Thanks.
Click to expand...
Click to collapse
It'S an OEM HTC EVO 3D Battery thanks.
Juice plotter
samnada said:
I'm going to be devil's advocate for a minute. There's no way to tell the capacity of a battery by taking a snapshot of its current state. If you are telling the app what the mAh is and the battery is charged to 100% then it's making a calculation based on what you told it. It's not actually measuring the true capacity. The only way to determine the capacity of a battery is to fully charge it, then fully discharge it through a load and measure the current. There are no shortcuts, or apps that can do this instantaneously.
As indicated in several other threads the mAh stamped on 3rd party batteries are very unreliable. If you buy a real HTC EVO 3D battery then I'll say it's probable that the mAh is close to the rating, and your test would indicate you may well get more run time on the Sensation. If you buy some other battery then YMMV.
It is good to know that EVO 3D batteries will fit though. Thanks.
Click to expand...
Click to collapse
You know, I was just thinking abut that same thing. I was under the impression that you had to put in the estimations yourself. I wanted to use it, but I did not know how reliable my guesstimations were.
I use Juice Plotter. It does not do the breakdowns like the app in the picture, but it does a good job giving you a guesstimation. Once you charge it and unplug it it will tell you how much battery it perceives you have left. I primarily use it for the battery drain graph. That is the most accurate thing about it.
Nevermind. Please delete.
that app looked nice so i downloaded the lite version to try with my anker battery see whats the estimated time ...i had this battery for about 4 days works very well and lasts way longer then stock battery very please with anker battery, maybe some one with a CHICHITEC 1900 should check what results he gets
-edit cant post links-
imageshack.us/photo/my-images/855/20110711140021.jpg/
imageshack.us/photo/my-images/811/20110711140126.jpg/
samnada said:
...As indicated in several other threads the mAh stamped on 3rd party batteries are very unreliable. If you buy a real HTC EVO 3D battery then I'll say it's probable that the mAh is close to the rating, and your test would indicate you may well get more run time on the Sensation. If you buy some other battery then YMMV.
Click to expand...
Click to collapse
Well said. That's why I didn't mind plunking down a bit more cash for the EVO 3D battery.

[FAQ]Battery

Hi guys, have 10 mins so decided to write up little explanation about batteries.
Main purpose of this thread is not "how to look after li-ion battery so it stays alive forever" but rather how to get best day to day performance without killing battery prematurely (before contract expires lol)
First of all, there is no such thing as battery conditioning or calibration with Li-Ion. When people say that, they refer to BATTERY STATS (software side) knowingly or unknowingly.
Second. Battery stats. Forget about clearing them every time you flash A ROM. ONLY do it if something is seriously wrong with battery reporting, you'll "feel" exactly when it's happening. Poor battery life is not caused just by bad stats normally, erratic and weird percentage reporting is. If you wipe stats every time you flash new ROM, it will take few full cycles to rebuild them during which you will experience poor battery life and blame the ROM obviously.
Third. Try to stick to FULL cycles as much as you can, 100%-0%-100%-0%. This helps to keep battery stats healthy.
Fourth. Discharging battery to 0% is NOT BAD! I repeat, it's not bad. That is until you start trying to discharge it completely by trying to start up the phone, or do not charge immediately (or within reasonable amount of time). Batteries are smart nowadays, and they shut down when they still have some charge left (surprise, surprise) so they don't get damaged.
This ^^^ works for any smartphone really, but keeping to full cycles help our Sensations especially, as it helps with touchscreen problems (see my or zmfl's threads).
All of the above are my findings, experimenting, searching net or discussing with other smartphone users, I have no hard data to prove it. So either believe it or don't, it's up to you. I know quite a few people who agree with the above.
If you find this useful i'd recommend making it sticky.
Any further questions will be answered to my best knowledge, and if i don't know something i'm sure fellow members will join in. I'll add more Q/A's to OP as they come.
Part 2
Bump charging.
Hmm, tough one. An odd battery will benefit from it, but most batteries wont. Bump charging will eventually damage battery and you'll be worse off in the end. Not recommended.
Battery percentage jumps up and down after reboot (Sensation specific)
Has been discussed A LOT here. There are plenty of explanations why it happens, I'm not sure if any of them correct, but the main thing is, just disregard it as it will catch up with correct % pretty soon by depleting faster/slower.
This is the best thread for battery IMO.
Thanks
likuku said:
This is the best thread for battery IMO.
Click to expand...
Click to collapse
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Thank you! Finally, a post on battery life that is actually factual.
Still not sure about the whole "Full discharge/charge" cycles, since Li-ions prefer partial charge, but regardless. Nice one
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282 views and 5 votes? Seriously?
As a electrical engineer I have to disagree with some of the statements.
From what I studied it's best practice to keep your Li-Ion fully charged. Keeping your battery discharged for a long time may decrease your battery lifetime. Yes, there are safeguards, but still it isn't healthy for the battery. It's not like going under a magical barrier of 3500mV causes dmg to the battery and 3501mV causes no dmg at all. It's bull****.
How to maximize your battery life?
Do not charge your battery when you're running high demanding tasks.
Do not softreset your phone when you're charging.
Do not discharge your battery when it's not needed.
Keep your battery dry.
Do not expose your battery to temperatures above 50C or below 0C.
Cool. Very good info, will add to OP if you don't mind.
Regarding discharge, I did say that if phone dies you should charge it immediately I do not recommend "killing" it, ie trying to start phone when its dead repeatedly.
It is indeed good to keep Li-Ion topped up at all times, bit disadvantage of that is messed up battery stats, which will cause incorrect readings and premature shut down- hence bad battery life.
Jackos said:
As a electrical engineer I have to disagree with some of the statements.
From what I studied it's best practice to keep your Li-Ion fully charged. Keeping your battery discharged for a long time may decrease your battery lifetime. Yes, there are safeguards, but still it isn't healthy for the battery. It's not like going under a magical barrier of 3500mV causes dmg to the battery and 3501mV causes no dmg at all. It's bull****.
How to maximize your battery life?
Do not charge your battery when you're running high demanding tasks.
Do not softreset your phone when you're charging.
Do not discharge your battery when it's not needed.
Keep your battery dry.
Do not expose your battery to temperatures above 50C or below 0C.
Click to expand...
Click to collapse
Sent from my HTC Sensation Z710e using XDA App
Jepp, doing 100%-0%-100%-0% cycles will result in best battery "calibration", but that's just software based as you mentioned. This would be excellent for older battery types.
And very good for Android battery stats. Basically, what I posted is explanation how to keep battery stats healthy while not damaging battery. From battery point of view, yes just keep it topped up to preserve it the longest. From Stats point of view, drain,charge,drain,charge is the best thing. Both are not good for each other. But, I'd rather have healthy stats for best performance in day to day use if I had to make a choice, since Anker is only 12gbp, and if I kill one, I'll just get a new one.
OP is basically how to keep Stats/Battery balanced without affecting each other too much.
Just remember disclaimer, all of the info is what I found by reading and from personal experience. You don't have to take it for granted.
Jackos said:
Jepp, doing 100%-0%-100%-0% cycles will result in best battery "calibration", but that's just software based as you mentioned. This would be excellent for older battery types.
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Nice FAQ, mate. Helpful infos imo.
Sensation Xe battery with 2 days use
i have rom ARHD 3.6.7, bricked kernel 1.5 and my battery last 2days with moderate use
i only wip battery stat once when flash new rom.
The best charging strategy (for a long battery life, in terms of persistance) for a vehicle with a range extender (e.g. used in Stuttgart in some of the Mercedes buses) is keeping the charge between 40 - 60%. Higher and lower will shorten the life of the battery more. Since these vehicles use LiIon batteries, I think it should be the same for smartphone batteries.
Sibbi said:
The best charging strategy (for a long battery life, in terms of persistance) for a vehicle with a range extender (e.g. used in Stuttgart in some of the Mercedes buses) is keeping the charge between 40 - 60%. Higher and lower will shorten the life of the battery more. Since these vehicles use LiIon batteries, I think it should be the same for smartphone batteries.
Click to expand...
Click to collapse
Not exactly. Technology is fair bit different there afaik. Also, them batteries cost thousands, Anker costs a tenner.
Purpose of this thread is not how to preserve battery longest, but how to get best performance day to day use without killing battery too soon.
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tinky1 said:
Not exactly. Technology is fair bit different there afaik. Also, them batteries cost thousands, Anker costs a tenner.
Purpose of this thread is not how to preserve battery longest, but how to get best performance day to day use without killing battery too soon.
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Click to expand...
Click to collapse
Cool as you know my topic was closed most of issues have been solved although battery life remain in progress. If you don't mind I will be happy to post my results from anker here in compare to stockresults as I have plenty screens to compare and both batteries have been use on exactly same setup with same use.
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Yeah, carry on. Just specify wherever you followed advice from the OP or not.
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tinky1 said:
Yeah, carry on. Just specify wherever you followed advice from the OP or not.
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Click to expand...
Click to collapse
Mostly. My topic was reopened so I will keep on posting there on regular bases however after week or two when I will finish testing will post my final results and comparison here as well. My topic is already messy so it will be kind of blog on testing battery life and because this one is clear and nice I will just upload screens with final results.
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Good lad. I like your style, seems very sensible
leyus said:
Mostly. My topic was reopened so I will keep on posting there on regular bases however after week or two when I will finish testing will post my final results and comparison here as well. My topic is already messy so it will be kind of blog on testing battery life and because this one is clear and nice I will just upload screens with final results.
Sent from my Sensation using XDA App
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Click to collapse
Sent from my HTC Sensation Z710e using XDA App
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 smaller the depth of discharge, the longer the battery will last. If at all possible, avoid frequent full discharges and charge more often between uses. If full discharges cannot be avoided, try utilizing a larger battery. Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles other than to calibrate the fuel gauge on a smart battery.
Source:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Comments:
Yes I will still do my 5 full charge, discharge cycles to calibrate stats nicely but then I will try to replace my batteries before they are gone, reading that convinced me that there is no point on doing this to often, at the end of the day, how big can be impact of software stats on battery life? With this article you can clearly see that way you charge it does have massive impact. I'm not arguing that proper calibration etc. does not have it but still don't think it is that much as this article reviled.
Thanks!
Bad battery stats might simply shut down your phone before it should (say you might still have 20% left but phone thinks battery is empty).
Again, I'll repeat myself, I'll sacrifice £12 battery for the sake of having phone running longer any time, but main purpose of this thread is how to get most out of battery without sacrificing It's longevity too much too soon.
Let's not go down the route where people argue about how to preserve battery from dying for 10 years, its not the point.
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So I bought a refurbished Nexus 5. Think they cheated me on the battery? :)

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In short: I think your battery is fine.
In long: Batteries are incredibly complex units, with slight allowable tolerances on the actual total mAh charge the battery can hold. I don't know the tolerances these batteries are built to, but they are not exactly 2300 mAh. I don't use the app you took a screen-shot of and the numbers aren't explained, so they mean nothing to me. I have no idea what they are trying to tell me, though I could make some assumptions that are probably wrong to some extent.
Also, an important thing to remember about lithium batteries is they do not tolerate a full discharge. This will damage the battery (irreparably). OEM's implement a floor at somewhere around 5-10% battery charge to prevent the consumer from either accidentally or intentionally fully discharging the battery. This is why the device will boot up on a low battery (after low battery shutdown). But it will immediately initiate shutdown again to prevent battery damage (or at least limit it). There is a great thread about lithium batteries in phones here: http://forum.xda-developers.com/showthread.php?t=1168036. The point I'm making here is that app will never show a complete 2300 mAh of battery usage because the batteries circuitry will not allow it. So, if I understand that apps numbers correctly your battery capacity is probably ok.
Keep in mind this post was by a 3rd party and not a battery engineer, but most of the advice is pretty sound (I'm not a battery engineer either, but I am a Mechanical Engineer and most of his comments pass a sanity check).
Thanks for the long reply. I'm puzzled by this really because my SOT is barely 2.5 hours on a good day. I currently lack a SIM (waiting on one) and I have been just using airplane mode with WiFi on. My drain with screen off is somewhere around 2%. I am running M rooted with elementalx and I have a -50mv under clock across the board. I'm also using the conservative governor at the moment. I have greenified everything except Facebook and my last power cycle only showed the screen, system and WiFi as the only things consuming battery. My screen brightness is cranked way down. On battery I can pretty much see it dropping at a rate of 30%/hr with the screen on. If I under clock to 1.2ghz I get closer to 20%/hr. Currently I can't even get through a 16 hour day with light usage. I'm reading consistent reports of 4-5 hour SOTs with some power conservation and frankly I don't know what more I could do other than under clock to 500mhz which I must say us pretty laggy. Yeah I know draining to 0 is bad, but it looks like I don't have much choice right now or I could just leave it on charge all day. Awesome. I think I should try swapping the battery. My current problem is finding a good source for a genuine oem battery.
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I think this is the worst battery life I've ever had from a phone. I'm pretty sure my G1 was nowhere near this bad but I do remember eventually moving to an extended battery.
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