Database Develop

Froyo FRF85B Battery Life Quirks

I don't know if I am the only one seeing this, but when I had Eclair, I had crap battery life, to the tune of 10 hours or so. (Granted this may not be crap for Nexus One but it is crap based off past phones I have had.) I installed FRF85B last night and discovered some weird glitches.
First off, when it was in my car dock, it wasn't charging yet the battery life kept dropping, I powered off the device, and powered it back on 10 minutes later (still in the dock) and no change stayed at 91%, still wouldn't charge. I then powered it off, took it out of the dock, plugged in the car charger cable directly and powered on my N1, when it turned on, it said I had 100% battery life. I then plugged it back into the car dock, and voila it started charging.
Secondly, originally when I had unplugged my N1 this morning I used it for about an hour at 5AM and it dropped 2% I plugged it back in to top it off expecting the same crap battery life from Eclair, yet so far, my phone has been fully topped off (from the car dock) for the past 40 minutes and I've made about 20 minutes of phone calls on it, yet it still is reporting 100%. So either Froyo can't properly report battery life, or it has the potential to have absurd battery life. Anyone else experiencing anything like this?

First off - you still didn't search this forum, so you're still thinking that an overcharging protection that doesn't allow you to charge unless you drop below 91%, is a quirk. It's not.
Second, wiping battery stats and making battery calibration procedure ONCE will give you a good starting point to measure something.

Jack_R1 said:
First off - you still didn't search this forum, so you're still thinking that an overcharging protection that doesn't allow you to charge unless you drop below 91%, is a quirk. It's not.
Second, wiping battery stats and making battery calibration procedure ONCE will give you a good starting point to measure something.
Click to expand...
Click to collapse
The quirk isn't that it wouldn't let me charge that way, the issue was, my battery reported 91% yet when I rebooted the device with the charger directly plugged into it, it immediately showed 100%. So pretty much over the course of 30 seconds I gained 9% battery life.
I wiped my device to factory settings before upgrading to Froyo, and after as well, since my device is not rooted, my understanding is I cannot wipe my battery calibration log.
I did drain my battery fully after upgrading to froyo last night and did a full charge as well.

What you're describing looks like the statistics of the battery is "lying" a bit. I believe it can be thrown a bit off by trying to charge it when it's in 91-100% range, but I don't know the exact way it works, so I can't say much about it.
Indeed, if you're not rooted, wiping battery stats is not an option. Several times of full charge and long discharge (you don't need to go below 20%, to prevent harming the battery) are helpful in correcting the statistics.
If you get a chance to try, please repeat this again (having the phone at >90%, turning it off, plugging it into the charger and turning it back on). If it shows "Charged" again - it might be a bug worth reporting.

Jack_R1 said:
What you're describing looks like the statistics of the battery is "lying" a bit. I believe it can be thrown a bit off by trying to charge it when it's in 91-100% range, but I don't know the exact way it works, so I can't say much about it.
Indeed, if you're not rooted, wiping battery stats is not an option. Several times of full charge and long discharge (you don't need to go below 20%, to prevent harming the battery) are helpful in correcting the statistics.
If you get a chance to try, please repeat this again (having the phone at >90%, turning it off, plugging it into the charger and turning it back on). If it shows "Charged" again - it might be a bug worth reporting.
Click to expand...
Click to collapse
I'll have to try it again tomorrow morning, first see if it happens under the same circumstances and go from there. One thing I do remember is the widget I was using "Battery Left" reported that at 91% I had 4100 mAh left in it, which was interesting, and when it went back to 100% it had 4120 mAh which makes me think the OS wasn't actually reading the voltage and thought it was just draining the battery instead.
EDIT: Just realised I had my wall charger with me, battery was at 90% figured I would try, real quick to attempt to replicate the problem, I was unable to, with a direct battery connection, but it could be due to a voltage issue or be related to why plugging it in directly to the car charger resolved the issue. My gut feeling is, it has to do with the dock itself and the pins it uses.

my battery often is charging and it hits 93% and immediately jumps right to 100%. it skips the last 7% or so. i think what is happening is you just finally experienced this issue, which many of us have already posted about in battery threads, but it just happens to coincide with froyo so you are thinking its new and related. the nexus ever once in a while battery meter just gets thrown off and will jump up to 100% because it really was full, just had to catch up the meter. you really should pay attention to the voltage more than percentage, using battery life widget. i know my battery is fully charged at 4.172 volts. and sometimes it hits that but still only shows 94%, so it adjusts itself in one fell swoop.

The issue is I did an extra full charge about an hour ago so I can make it till midnight and it went through all the numbers from 89-100 with no issue
Sent from my Nexus One using XDA App
Addendum: Also it seems to be voltage is not that good of a decider of how much my charge is. Before Froyo, until I dropped below 94% I was always above 4 Volts, now I drop below 4 Volts at 96%.

So this morning I was able to replicate the problem, only it was outside of the car dock, I was able to get this problem to reoccur with the wall charger. I unplugged it from power, used it a little bit and then topped it off for the day, it was at 96%. I saw the green light go on, and thought nothing of it, 20 minutes later I went back to it and it was still at 96% and showed that the battery was fully charged.
I checked the Battery Left widget and it was saying the battery was fully charged even though it said 96% left also. I did make a crappy video uploaded to youtube from my backflip to show as well what I am talking about.

AFAIK, The green LED will light when you're anywhere above 90%. It's not a function of charge being complete. Check it.
Also, if you plugged it in with 96% - this is the behavior to be expected, since the phone won't start charging unless it has below 90% to begin with, and it'll show "Charged" - because it's not charging (to prevent overcharge).
Again, fail to see any problem in what you're describing.

Jack_R1 said:
AFAIK, The green LED will light when you're anywhere above 90%. It's not a function of charge being complete. Check it.
Also, if you plugged it in with 96% - this is the behavior to be expected, since the phone won't start charging unless it has below 90% to begin with, and it'll show "Charged" - because it's not charging (to prevent overcharge).
Again, fail to see any problem in what you're describing.
Click to expand...
Click to collapse
Yet my phone has always been able to charge when above 90% before froyo. This behavior is new to froyo for me at least.
Sent from my Nexus One using XDA App

It means that you've never paid attention to that until now. It's working this way since the phone was out (with stock Eclair) and if I'm not mistaken - it's not controlled by OS at all.

I did pay attention to such actually because of the fact that I had been getting piss poor battery life. This has never happened before. In the morning I would use the device a little then top it off because I noticed that works give better battery life.
Sent from my Nexus One using XDA App

Well, you had a buggy phone that has now corrected itself. Welcome to the way it was supposed to work from the beginning.
Topping off the battery at 90%+ contributes to battery degradation - heating from overcharging. So you were actually damaging your battery.

[Q] CM (and others?) battery meter complete screw-up

My battery never charges above ~76% when plugged in. After rebooting however, it is very much at 100% and lasts for a good amount of time. This is not necessarily a question, but I wonder if others are experiencing this too and if there is a fix? Read below.
I noticed that my battery life got very bad after installing custom roms. I also found out that this happened because I sometimes kept the phone plugged in while flashing, something that totally screws up the battery reading. So, I followed this guide to calibrate my battery and it worked.
Now, whenever the phone is plugged in it NEVER goes to 100% when charging. Maybe 80% if leaving it for a while (10 hours overnight). I'm worried about frying the battery. Is there a fix?

It is only a matter of presentation. It actually doesn't mean your batt is broken. Plug it and charge it overnight. Then discharge only for few percent and plug it back in. It should go to 100%.
Sent from my HTC Legend

Thanks, I'll give it a try.
What I'm concerned about is if the phone "thinks" the battery isn't recharged and keeps squeezing juice into it when in fact it is full (which a reboot will show)? That's not good for the battery. It should go into trickle charge after reaching 100%..

The process described in the desire forum is also known as formatting the battery. In fact most of battery manufacturers (lithium battery manufacturers) recommend doing this in a slightly different way:
Before first use:
1.) Before powering the device on, plug it in and let it charge until the LED is green (fully charged)
2.) Then take the battery out of the device and wait an hour (to make sure all the chemical processes in the battery are as idle as possible)
3.) Then plug it back in, while still off and let it charge untill green LED
4.) use the device....
You can practice this slightly modified with first step being:
Discharge the battery (by normal use)until only few percent are left (1 - 5 % are OK)
I've done these steps with my Mugen extended battery and I was getting around 4 - 5 days on Legend, now I'm getting 2 - 3 days on Desire S, but the ROM isn't very optimized yet, I believe it will be better in time...

Just one thing... Why is this in Development!?

No Idea.....
can mods move this?

BlaY0 said:
It is only a matter of presentation. It actually doesn't mean your batt is broken. Plug it and charge it overnight. Then discharge only for few percent and plug it back in. It should go to 100%.
Sent from my HTC Legend
Click to expand...
Click to collapse
sz1a did this solve your problem? Have the same problem with every firmware i've tried....

peddalion said:
sz1a did this solve your problem? Have the same problem with every firmware i've tried....
Click to expand...
Click to collapse
Definitely did not solve it but at least the battery performance is ok. It just stays at 78% for a few hours drops from there. Very weird but as long as the battery doesn't get broken I guess it's ok.

Do you have some 3rd party battery installed in your Legend? I have one 1,5 Ah in mine and it is acting the same way. It doesn't bother me too much coz it was cheap... it lasts 48 hrs with data always on and moderate usage. I noticed this that when I charge it overnight and it reaches 80%, unplugging it stays at 80% for several hrs and just after it starts dropping if I plug it again, meter reaches 100%. It's weird but as I said I can live with that

I've got exactly the same issue with stock 2.2 ROM. I've never rooted or CM my phone; I was wondering if CM would do it, but doesn't look like it.
android forums /htc-legend/265545-battery-doesnt-fully-charge.html
(sorry, I can't post links; maybe an admin can fix the link for me?
This seems to indicate it's a phone hardware fault and requires a new Legend to fix! My big worry is, as stated, that the charging light never goes green; therefore is pumping lots of power into a potentially full battery.

Theory ROM 1.7 battery issue info

Hi All,
I'm a new registered user, so I can't put this in the developer forum yet.
I noticed a problem where I was losing battery power quickly, so I foudn a posting that said to do a "super" wipe. This was to one click recovery to stock, root, bootstrap, then boot into recovery to wipe cache, data, dalvik, format /system, wipe cache, data, install theory ROM 1.7. after clearing dalvik the second time, I threw in a "clear battery stats" for good measure.
What I noticed was this: prior to attempting any of this, the phone reported to be 96% to capacity and said it was "full" so it wouldn't charge any longer. After doing the sequence above, upon initial boot up, the battery was now reporting 88% and was charging again.
It would seem like the mechanism for reporting the battery usage is flawed in some way.

I am running a few days of testing but the calibration methods are to drain fully, and charge (while device is off) to 100%, unplug and before turning on, charge additional. Before my full charge read 95%, on 1.7. I did the above and now it read 100%.
From the beginning, here's how my battery life was:
Day one: full drain with performance mode, I received 8-9 hours. Used maybe 60 mins of voice, email sync w gmail and touchdown, sent about 100-150 texts. Watched 2 episodes of the community streaming from zumocast on 4g radio all day, used Pandora a few times.
Night one: night time saver mode, this is where I discovered my full charge was only 95. My night time mode activates at 10pm, my "full charge" completed at 7pm, used Pandora
On the ride to the gym, had minimal texts, email sync, twenty min phone call, 4g radio on. Went to bed at 10pm left phone idle, no charge. Woke up at 630am night time saver ends at 5am, device reported almost 12 hrs idle time, 40% battery left. Pandora to work, 4g only, synced mail, browsed YouTube, Facebook, no calls. phone full drained around 1140am. So almost 16-17 hrs on one charge, but the high light was 5 hrs from 40% battery... Last to note, I never turned off blue tooth.
Currently, after full charge 100%(not like previous 95) I'm at 1hr26 mins and at 85% bat...same usage, same battery mode
Ill get further results soon.
Update: now at 55%, 3:55hrs on track for about 8-9hrs ... Not using app killers to add or any battery apps. Problem seems sporadic but I'm going to try to run full battery to full drain on performance mode to optimize..in my past experience Droid 1 and Droid x, over time the battery adapts or the phone adapts to the battery usage ... Could be a myth or fantasy ...
Sent from my DROID BIONIC using XDA App

Thanks a bunch for the info. I am in the process of doing the full drain right now. Hopefully, it will show some results.
-Brian

Beefcake550 said:
Hi All,
I'm a new registered user, so I can't put this in the developer forum yet.
I noticed a problem where I was losing battery power quickly, so I foudn a posting that said to do a "super" wipe. This was to one click recovery to stock, root, bootstrap, then boot into recovery to wipe cache, data, dalvik, format /system, wipe cache, data, install theory ROM 1.7. after clearing dalvik the second time, I threw in a "clear battery stats" for good measure.
What I noticed was this: prior to attempting any of this, the phone reported to be 96% to capacity and said it was "full" so it wouldn't charge any longer. After doing the sequence above, upon initial boot up, the battery was now reporting 88% and was charging again.
It would seem like the mechanism for reporting the battery usage is flawed in some way.
Click to expand...
Click to collapse
Our phones read fully-charged at 95 percent, but if you keep it plugged in it will get to 100 - it just takes a good while.

There's a trick to that. Yank the back back cover, pull the battery, and unplug the phone. Plug the phone back in and wait for the "missing battery" icon to show, then slide the battery back in. It will initially read 5%- wait for it to charge to full, which should take 10-15 min. Repeat this process until the status reads 100% charged within a few seconds of putting the battery back in. Reboot into CWM and wipe the battery stats (or use the battery calibration app that's on the marketplace, if you don't use CWM) and you should be seeing a batter that's not only noticably more accurate in its charge level, but also charges more completely, resulting in somewhat better longevity.
You want to drain it fully and let it charge back up fully at least once after this process for best results.

MillionManMosh said:
There's a trick to that. Yank the back back cover, pull the battery, and unplug the phone. Plug the phone back in and wait for the "missing battery" icon to show, then slide the battery back in. It will initially read 5%- wait for it to charge to full, which should take 10-15 min. Repeat this process until the status reads 100% charged within a few seconds of putting the battery back in. Reboot into CWM and wipe the battery stats (or use the battery calibration app that's on the marketplace, if you don't use CWM) and you should be seeing a batter that's not only noticably more accurate in its charge level, but also charges more completely, resulting in somewhat better longevity.
You want to drain it fully and let it charge back up fully at least once after this process for best results.
Click to expand...
Click to collapse
This is a good trick, one I was taught by juhde. I used it on my x2 to great results.
However, I can't get it to read on my bionic. I get the '?' but nothing after I reinsert the battery.
Sent from my DROID BIONIC using xda premium

I find it only works when I unplug it and plug it back in just before inserting the battery. It sometimes also helps to hold down the power button for a few seconds with both the battery and charger out in between 'bumps'.

my fix
I have flashed every update since the first post and had battery issues starting around 1.5. After reading through the dev thread a bunch it seemed as the when performing wipes, they did not come out "clean" after one wipe. So I started at one wipe of each (factory reset, system, cache and dalvik) and the problem persisted. I then did 2 wipes of each, then 3 and 4. after 4 wipes of each all my issues had been resolved. not sure if it will work for everyone but it was the turning point for my device and might be a good starting point for anyone who is as annoyed as i was. good luck!!!!

Update:
Was able to repeat 17 hrs with custom settings: data off @30 min peak/off peak. Blue tooth was on the entire time, cell idle and Bluetooth were 30% consumption each.
Right now I'm in full performance on track to do 9.5 hrs. I've been playing Pandora for an hour every other hour, and did not kill its process.
I think the most practical usage is to cut data when not used for 30 min, I couldn't imagine anyone on their phone doing multiple things for 8+ hrs STRAIGHT. I'm running unleashed 1.7, no radio problems and no slow downs.
Sent from my DROID BIONIC using XDA App

My brother has been getting twice the battery life that I am getting. The only difference is I have rom installed, and he just debloated. I have a switch out extended battery coming from Verizon and if that doesn't work I may just drop back to stock debloated.
Sent from my DROID BIONIC using Tapatalk

I'm at 10hrs 11 min running performance mode, Bluetooth had been on all day. Cell idle 32%, blue tooth 30%, phone idle 25%, display 7% consumption. No data sync interrupts.
Sent from my DROID BIONIC using XDA App

efingguy said:
I'm at 10hrs 11 min running performance mode, Bluetooth had been on all day. Cell idle 32%, blue tooth 30%, phone idle 25%, display 7% consumption. No data sync interrupts.
Sent from my DROID BIONIC using XDA App
Click to expand...
Click to collapse
And your battery is drained? Or at a certain percentage?
Sent from my DROID BIONIC using Tapatalk

I think I have a faulty battery, I can't last 5 hours on a battery anymore. I'm going to go to VZW and see if I can pickup a spare and test that one.

This rom has absolutely nothing going for it. v1.7 and $6 will get you a cup of coffee from Starbucks. I have never flashed to stock as quickly as I did with this rom, since my first smart phone. Is this guy/team the only Dev with a Bionic??
Downloading/flashing on the fly (streamlined) is great however, what are we going to flash folks? 1.8??
Yes I know theory is only playing the hand he was delt but its clearly time to fold.
This makes me nervous.
For the issue regarding battery life..flash back to stock. Wait for the next developer.

volcomguyaz said:
This rom has absolutely nothing going for it. v1.7 and $6 will get you a cup of coffee from Starbucks. I have never flashed to stock as quickly as I did with this rom, since my first smart phone. Is this guy/team the only Dev with a Bionic??
Downloading/flashing on the fly (streamlined) is great however, what are we going to flash folks? 1.8??
Yes I know theory is only playing the hand he was delt but its clearly time to fold.
This makes me nervous.
For the issue regarding battery life..flash back to stock. Wait for the next developer.
Click to expand...
Click to collapse
Yeah? And what was the issue you had? ANY ROM you flash will nuke the battery stats and need to be recalibrated. Simple as that.
Sent from my DROID BIONIC using Tapatalk

kredlash said:
And your battery is drained? Or at a certain percentage?
Sent from my DROID BIONIC using Tapatalk
Click to expand...
Click to collapse
Sorry, yes it was at 5% when posted that, and that was right before my car ride with Pandora playing through Bluetooth.
The end time was 10hrs 35mins.
Since then, I have done a 4x complete wipe, cleared previous traces of unthrottle and flashed 1.7 again, disabled automatic restore apps while synching with google. I used the battery calibration app from the market this morning and have set custom battery management to turn data off every 15 mins of non use. This is practical since the power boost script shortens the time to speed up, so data on/off shouldn't affect performance. I'll update at the end of the work day. Currently at:
85%
1Hr 21mins
Maps 43% consumption (I'm adding GPS on all day in addition to blue tooth all day)
Cell idle 19%
Blue tooth 18%
Phone idle 14%
Sent from my DROID BIONIC using XDA App

I just want to add, I'm absolutely loving this ROM. I would advise to check your steps if you are experiencing problems, and as always, keep in mind that its an ongoing development.
Sent from my DROID BIONIC using XDA App

efingguy said:
I just want to add, I'm absolutely loving this ROM. I would advise to check your steps if you are experiencing problems, and as always, keep in mind that its an ongoing development.
Sent from my DROID BIONIC using XDA App
Click to expand...
Click to collapse
By your justification you are not getting normal/average battery life.
You are disabling data and your cellphone when not in use just to get close to average.
My battery drain has been pretty bad.
I have done all required steps (multiple times) but it still seems like the phone is just flushing the battery out of it.
The best life i have gotten is when (the other day) I was working from home and completely forgot about my phone.
I left it unplugged and after about 8 hours (of literally ZERO use no WIFI) the battery was at around 36%
Its like its pumping it out at full blast no matter what.
Note: I have all powerboost mods installed.

I just flashed back to stock, have the same apps and still getting the same battery life. I am actually getting more network disconnects for some reason, however common sense says that has nothing to do with stock rom or DT rom. Its a driver issue that will be getting resolved in Nov (hopefully) . Flashing back to my sexy DT rom tonight, with a full wipe.
Sent from my DROID BIONIC using Tapatalk

jblade said:
By your justification you are not getting normal/average battery life.
You are disabling data and your cellphone when not in use just to get close to average.
My battery drain has been pretty bad.
I have done all required steps (multiple times) but it still seems like the phone is just flushing the battery out of it.
The best life i have gotten is when (the other day) I was working from home and completely forgot about my phone.
I left it unplugged and after about 8 hours (of literally ZERO use no WIFI) the battery was at around 36%
Its like its pumping it out at full blast no matter what.
Note: I have all powerboost mods installed.
Click to expand...
Click to collapse
I don't really understand what people are trying to solve.
Your problem is you left your phone on performance mode and it drained your battery. That's like leaving you car lights on and expecting it not to drain the battery. I'm exhibiting extreme heavy usage vs normal practical usage and how the ROM does *not* affect it negatively relative to your daily usage of the phone.
In my normal day, I would not have bluetooth running all day, which from my above data consistently drains 30% of the battery. Bluetooth is only used when I'm in my car which it connects to the car audio for phone and music. In my normal work day, I would not have GPS running all day, which from my recent post is draining 43% of the battery. In a normal week, I would only need to use GPS to find a unique restaurant that maybe I haven't been to or in an area I am not familiar. The main point for the contribution in this "battery investigation" is that I am not experiencing any radio loss, connection failure, or system lag by having Data shut off.
I really do not see the occassion that anyone would ever use their phone heavily for 20+ hours straight. Or even more than a movie's length straight. I could think of possible arguement points such as hiking and needing it to last for saftey/emergencies -- but why would you have it full blast on performance? Long car rides -- but if you are doing an 8+ hour drive, don't you plan on having a car charger? I just don't get what people's frustrations are. I do understand the problem that people's battery tick abnormally which is a fault of either the device, a defective battery, or lack of following directions when using the ROM. Again, the ROM is a development, and no one is forcing you to use it. It is actually quite nice to test, run into a problem, report it and have it fixed within days/weeks instead of months or never like the stock.
I guess I've rambled into a rant, but I'm merely providing my own experience in details so that people have a general feel of how the battery is and if my usage is similar to theirs.
I'm not claiming to have average/above average battery life, I'm justifying that this has not affected my daily use of the phone for everything that I use it for (being connected to work, being socially connected, and games/movies/music).

Battery stats stay messed up

No matter how many times I calibrate my battery, it lasts for over 30 mins of straight youtube watching with 3g wifi bluetooth and gps on. I know there's no need to calibrate after the stat wiping after charging to 100% but I would like my battery to display correctly. The past two calibrations told me it was off by 8% but it did it twice not only once. So how can I get my battery to display correctly and not last forever sitting at 1%
Sent from my DROID3 using XDA App

Charge to 100% (leave on charger for 4-6 hours) then calibrate (remove batterystats.bin) then deplete battery until phone shuts off by itself, then charge without break to 100%.
Sent from my DROID3 using XDA App

There is no battery calibration. A google engineer has already ended that theory. The batterystats.bin updates everytime the phone is plugged in to charge. Dropping your battery to below 20% before charging is always a wise decision, but you can't calibrate it by deleting file.

ChristianPreachr said:
There is no battery calibration. A google engineer has already ended that theory. The batterystats.bin updates everytime the phone is plugged in to charge. Dropping your battery to below 20% before charging is always a wise decision, but you can't calibrate it by deleting file.
Click to expand...
Click to collapse
I already stated that above but my phone can sit at 1% forever and not die so somethings obviously off
Sent from my DROID3 using XDA App

Obviously it's your battery.
The phone gets the %charge by the voltage. A good battery has a linear drop of voltage during use, but if a cell is defective, it can report a misleading voltage drop curve while still having enough charge to work. IF the battery drops under a determined voltage AND current, it shuts off. While both conditions aren't met, the phone keeps using it until a safe point, where it doesn't damage circuits or the battery itself
Rocking with my M3 and XDA app
Hash's ICS Alpha 7 + Camera fix

Battery Calibration

Okay, I know this won't improve battery life in the end, But is it good to run one of those apps after doing a fresh ROM wipe? I know that if you don't, It can report false battery readings and cause it to appear to be dying faster than normal, etc.
What's a good app to use? Is it worth doing, or even needed?

Most if not all recoveries have a battery stats wipe included. Some ppl recommend doing it every time you flash a new ROM, but that's overkill and completely unnecessary. Certain ROMs will even just calibrate it themselves. I haven't noticed an improvement using it on either of the devices I've used, but if it makes you feel better charge it all the way, turn off the phone, replug the charger until the LED goes green again, boot into recovery, wipe battery stats and then let the battery discharge ALL the way.
Sent from my HTC PH39100 using xda premium

Also, as soon as your battery reaches a 100% the android os is supposed to wipe the battery stats...so if you flash on a full charge there is no need, even if you don't flash on a full charge...just charge it to a 100%, maybe do a reboot and charge again to make sure...
I've never done a battery stat wipe in my life, (well actually I've done a few back on my infuse in the begining of my flashing days) anyways...Ive pretty much never done battery stat wipes and I've never had any issues with battery readings, not on my vivid and not on my infuse...and sometimes I flash when I'm down to 15%!!! I only do that cause I'm confident I could fix a brick from a bad flash...
Sent from my HTC PH39100 using Tapatalk 2

Wiping your battery stats is like throwing salt over your shoulder when you spill some. It's a superstition.
All the battery stats file does is keep track of which apps are using power and for how long (ie what's displayed on the Usage screen in the settings menu).
But you don't have to take my word for it... Google says so: http://www.androidcentral.com/wiping-battery-stats-doesnt-improve-battery-life-says-google-engineer

[HTC Vivid] My battery life suddenly decreased by 60%. I know this thread is old as hell but figured out the problem for myself... The orange LED indicating a charge (or even the software) will say charging when it's not. I realized my charger was only halfway in the power strip.. turns out the outlet or cord was bad still not sure but yea.