yashsingh1/xdaforums huggingface dataset:
[Desire General] itshotinhere:
While I agree this 'fix' does sound somewhat suspect I'm willing to give anything a try to get better battery life.

Like many others (it seems) if I followed the methods described in these posts I would simply get the green led immediately when plugging the charger in when the phone was powered off (after charging fully with the phone powered on). I did, however, stumble upon something else by accident. I performed the following (thanks go to kthejoker20) and have since modified...

1. With the phone switched on fully charge the battery (i.e. until the led turns green).

2. Once the led turns green, unplug the charger until the led goes off.

3. After the led goes off, plug the charger back in. When the led turns green (probably immediately), power off the phone (with charger still in).

4. With the phone fully powered off WAIT until the green led turns OFF and automatically turns back ON. It should now be orange. When it turns green (after about 5 minutes in my case)...

5. Unplug the charger.

6. Wait until led goes off.

7. Plug charger back in until the led turns green (probably immediately). When it turns green, unplug the charger again and go to step 1.

Repeat steps 1 through 7, x times (where 'x' is the number of times it takes for step 4 to go green / green as opposed to green / orange). This may take anywhere from 30 seconds to 30 mins per cycle. Typically only about 1 minute (although about the time it takes to have a cigarette in my case ;-).

After that, wipe battery stats and test...

I will report back with my own results but the fact that it took 5 cycles for step 4 to go eventually go green / green means that there was definitely some charging still occuring. Fingers crossed.

ihih.
[Desire General] albert_htc:
That's a bit harsh. :eek:

I use the phone as a phone and also to browse the web, check my email, play games, wireless access etc..

So an old Nokia won't do ;)

I still haven't charged it up... last night I spent 40+ minutes online via wireless, then played the angry birds demo (oh that is addictive!!).. Only had 6 calls in the day & 2 - 3 texts.

Stats are:

46%

3811mV

Boot Time: 49:35:16
[Desire General] hover99:
I have a serious problem. Tried the routine in the first posting with my Desire some days ago and wiped the battery stats after that.

Now my phone uses around 20% in the night without any process running and only facebook sync every 4 hours, no email sync.

When i charge it to 100% and start the market i get 99%, surf one minute 98% and so on. After some minutes im at around 95% and falling.

So i have to charge it twice times a day to work with it.

The funny thing is, before the battery tweak my Desire was great and i had around 26 hours usage and no battery drain.

Could it be possible the battery "trick" killed my battery?

I tried the procedure 3x and no success, and reinstalled Froyo complete, tested 2 different Custom Roms..

What can I go? Thanks

Edit: Bluetooth/GPS/WIFI all off and only UMTS active..

Edit: I'm really desperate, after 1 hour standby, 15minutes low usage and not a single user process running in the background my Desire is down at 77% ! I really wish I could undo this damn battery tweak with definatly killed my Desire!
[Desire General] choccy31:
Done mine earlier.

Very weird as the Battery Voltage keeps changing - it currently says 4055mV but has shown 3 different numbers now!

So far 3 hours 18 mins and 95% down

Used only for a couple of texts about a min worth of twitter - and quick internet usagage (2 mins tops).

And look at some photo's quickly via Gallery 3D.

No idea if god or bad really?
[Desire General] MistaJae:
Wiping Battery Stats

Hi All,

I'm using Clockworkmod recovery and when I select 'wipe battery stats' there is no info to say it has been done. It just returns to the main page highlighting 'Reboot system now'.

My question is, how do I know if my battery stats were actually wiped?
[Desire General] corniaud:
It's normal and can't be changed.
[Desire General] choccy31:
Same for me too, I just assumed that it had wiped them.
[Desire General] choccy31:
Well,

Mine is now showing Battery Voltage of 3957 mV (Changed again)

90% After 4 hours 25 mins.

Have used little more twitter - bit of web (via network) and about 8 mins of game use (solitaire and Checkers)

But why is the Voltage value keep changing?
[Desire General] baumi1899:
same for me..
[Desire General] ajanu:
Because the resistance of the battery is staying basicly constant. V=I*R. It's normal, you should only see max voltage at 100% battery.
[Desire General] pepinogsm:
same for me
[Desire General] litening:
Have exactly the same problem. Battery was ok before the procedure and has gone to **** after that.

I don't think it ruins your battery. I have three different batteries and all three show the same issues. Also when they have been fully charged outside the phone.

I fear that in my case the procedure has messed up the volt meter in the phone.

When fully charged, the voltage of the battery measured with a separate voltmeter reads 4,200 mV.

Stick it in the phone and the phone will read 4,109 mV.

If this is true, it should be possible to recalibrate the voltmeter.

N.B. I don't mean recalibrate the level at which the phone thinks it's full, the voltmeter itself.

Anyone have any idea?

N.N.B. maybe we should start a new topic about this?
[Desire General] venkig:
This procedure did no good to me. I bought my phone 5 days back. I calibrated the battery just like you told me. Just the last time when I switched off the phone and turned back on it became 98%, 2 mins later 96%. The phone was on standy by for 5hours and the battery was 88% in the morning.

1. I don't have 3G/Edge connection.

2. Hadn't enabled Wi-fi, 3G or bluetooth

3. Checked battery information and there is no sneaky app draining the battery.

4. No live wallpaper either.

Does it take a while for a new phone for the battery to get trained ?
[Desire General] alex_mib:
I tried to do like it is said in post 1. But after I fully charge battery (green led is on) I turn the phone down and connect charger again and the green led is instantly on. I understand that it should charge for some time and just then lit green led?
[Desire General] bluelavender:
Hmm, i tried the procedures on first page, with the additional procedure of wiping the battery stats (since i'm rooted). The result is very tremendous difference.

Before the calibration, turning on live wallpaper and wifi and leaving it the whole night without charging can bring down my phone to 70% battery capacity only by morning..

Now, i still have 98% in the morning...
[Desire General] choccy31:
Can anyone advise as to why K9 Email always now seems to be in the running services section?

Really bugs me as it never used to be there a few months ago.

I'm sure that affects the battery also.
[Desire General] choccy31:
Well after having it off on charge last night after 15 mins on this morning with wifi battery dropped to 96% very quickly. Oh well.
[Desire General] siliconaddict:
That sounds absolutely great to me, 13% in 16 hours with very moderate use.
[Desire General] supergoosepro:
Help!!!

How do i wipe battery stats on HTC Desire?
[Desire General] siliconaddict:
Via ClockWorkMode Recovery > Advanced > Wipe battery stats
[Desire General] drvdijk:
That yields no response from the recovery. If I wipe anything else, it gives me a response like "success, wiped bla". Wiping battery stats does not, indicating it is not wiped I guess?
[Desire General] interqd:
wel..

if i just do the calibrating without wiping batt stats..will it do any good ? mine is rooted
[Desire General] kmetek:
will do tomorrow cause i need to charge it anyway.....
[Desire General] Dany0:
No it's because the battery has some kind of protection against over-over charging(in case that you have bad charger/electricity connection). It has a small module in it that protects it from going to the real 0%(in which case the battery is totally dead and unrecoverable) and from going it to charge itself to 110%-ish. That stuff happens, so the module must first "learn" it's okay to charge it 100%.

I think that somewhere I've read that it's.... oh there it is

So 4197mv is full charged. When it goes over like 4200mv it's very dangerous and it may blow-up quickly. If it goes 4500mv-ish it's just BOOM!

And soo.. yes 4197 will never blow-up(seriously) a little more then that and boom. This "hack" makes the module "learn" to charge it to 4197. Or less in most cases.
[Desire General] schidddy:
okee cool thx for the good explanation m8!

but now here comes something REALLY weird...

as i wrote i charged up about 3 hours ago with 2 sms and some recent check ups in between... and now i did a call lasting about 8 minutes

i hanged up the phone the indicator is still showing up 100% :D

wtf :D

normaly i would have been down to 92% or something like that..

i dunno what to say xD

my desire says unplugged since 19:07

my time is 22:39 now here :D
[Desire General] kmetek:
Did you guys have waited to battery to drain to 0% and then started charging etc?
[Desire General] elvis56:
I guess this works as this is pretty much what I did a few days ago and ever since then I have great battery life on normal use(email, browsing, calling texting, youtube) I let the battery run empty, charged to 100% and then wiped battery stats. I get about 40 hours now, will try this method and report back.
[Desire General] siliconaddict:
Most of the time I let the battery run dry untill the device powers itself off.

That's not untill 0% BTW, the system has a kind of protection that shuts the device down when it still has a few % left, or else the battery would be damaged.
[Desire General] kmetek:
Yes 4-5% indeed.

Anyway i set up another profile in SETCPU:

CHARGING/FULL 576/max

100% priority

and noticed it's charging much faster, it's that reasonable to leave priority at 100%?
[Desire General] niiico69:
I can confirm the 'less in most cases': my battery isn't able to charge above 4128mV, even after the trick.
[Desire General] kmetek:
where to measure mv's ? another widget?
[Desire General] Lennyuk:
Ok lets clear some things up

Why do I need to do this

On all android roms, if you flash a rom while charging or during the first boot screen on first boot it mucks up the levels android thinks the phone is at, i.e. will think your at 100% when maybe your only 90% or whatever.

So you will in theory need to do this every time you flash a rom while charging, so in otherwords just remove the usb cable before you flash the rom and put it back in (if you must) after the first boot screen (when the custom screen or whatever shows).

Should I drain my battery all the way?

No! with these sorts of batteries you do not want to drain them all the way, there is a method of calibration that asks you to drain to 5% (NOT ALL THE WAY!!!!) but there really is no need as the way I outlined in my post (post 5?), and the OP works just fine.
[Desire General] siliconaddict:
Search the Market for an app called Overcharged.
[Desire General] alex_hk90:
Same here. After upgrading my ROM to a 2.2-based one, the battery life has more than doubled. Looks like it was miscalibrated after my previous ROM upgrade. Nice to have some idea of what was going on. :)
[Desire General] perettigiuliano:
where do you read that stats have to be wiped??
[Desire General] kmetek:
thanks sili, looks similar to battery indicator.
[Desire General] Lennyuk:
Its well known on other android devices that you need to do this to correct battery readings.

However just refer to my previous posts in this thread for full explanation as to why.
[Desire General] cyron_at:
I am a bit confused now:

Should I wipe the batt. status or calibrate the batt - or both?
[Desire General] Lennyuk:
Combine the OP post with what I said (post 5 or something) you need to wipe stats to properly calibrate the battery.
[Desire General] Mr_Maz:
did this 14 hours ago, since then lots of emails recieved and viewed, a few text messages, a bit of gameplay and some surfing, no calls though.

Battery life is at 70%
[Desire General] kmetek:
Charge till full when powered on - LED GREEN

power off DID

charge till full again BUT HERE IT WAS LED GREEN INSTANTLY, so actually I'm missing something? :P

boot into recovery wipe stats

boot and continue to use as normal
[Desire General] Lennyuk:
if yours did this then it looks like your battery stats were already ok lol

If you read my post on page 3?? it explains why this process is needed in the first place, and what causes it to be needed.
[Desire General] Jgruar:
Has anyone tested if this really does any good or just changes the way the phone reports the percentages? Im having a hard time believing this would affect real-life battery performance in any way.. never calibrated but just minimizing the battery consumption when not using the phone etc and im having a great battery life.

This isn't some magic trick, it has to be based on something, and im not convinced.
[Desire General] Akarim47:
I saw a couple of posts about people with more than one battery but no one responded to them.

how to do this if you have more than one battery?
[Desire General] Cooperman_UK:
Update to post a couple of weeks ago.

Installed Pinky Desire 1.8 and radio .17_2 with Ultimate Juice and battery life for me is great (Calibrated battery after flashing rom), just got 63 hours with 15% battery left. Mostly data with about 35-45 mins phone calls, 20 mins internet browsing, 20-30 texts and about 50 emails some with attachments. Friendstream, news and weather updates every 2 hours. Overnight drain is only 3%

I know everybody is different but this usage is normal for me so I'm happy.
[Desire General] mi3x:
Thanks!!! I am doing it right now, I left in to charge overnight it got to 4187 mV. Hope I'll see good improvments.
[Desire General] siliconaddict:
It doesn't show any info but it does wipe battery stats.
[Desire General] drvdijk:
I think so as well, but how can we verify this?
[Desire General] siliconaddict:
Use Root Explorer to check the size of /data/system/batterystats.bin I guess.
[Desire General] Muuhmann:
Hello!

Thanks for the advice on how to calibrate my battery.

I did this yesterday in the way OP said with a Battery Stats Wipe after.

Today I let my Desire run dry.

I noticed that it shut it self down at 14%! Before calibration it would last till 3-4%.

After it shut itself down, i restarted it and it booted. After the PIN screen showed up, it shut itself down again.

That's when i plugged in the AC adapter.

I booted it and had a look at the battery level: I couldn't believe it battery level said 0%!!

Now I'm a bit afraid that i maybe destroyed my battery.

I attached a graph showing the battery levels since last time i charged it.

Could this be a simple incorrect display of the values or was it really at 0%?

Edit:

Now i've charged the phone and something is really wired.

Last time i checked the battery level was 92%, LED orange, 5 minutes later the LED was green and battery level 100%.

Battery Graph says the same.

So it seems, that it charged to 92% and went there straight to 100%. Really Strange!

Is there a way to "reset" the battery to the way it was before?

Because I think that all the calibration just messed with the values of which battery level is shown.

It lasts longer on 100% but shuts down at 14%. So whats the point?
[Desire General] siliconaddict:
There's a safeguard built into the device so that it can never drain the battery to 0. Even though the graph said so. The graph shows this because the device doesn't quite know what the battery level really is. And that's why it powers off at 14%.

Repeat the procedure 2-3 times -don't forget to wipe battery stats- and then tell us how battery life is and how it discharges.

Again, this is what worked for me so it also should work for you. My battery life is great now, approx. 2 days with modest use. I use JuiceDefender, APN/WiFi every half hour for 5 mins when screen is off, Wifi only at home occasionally, Bluetooth for car kit only twice a day 30 mins so 60 mins/day, 5-10 phone calls each day, 5-10 texts each day, RSS feed syncing & reading twice a day (via APN or WiFi), approx 30 mins of web browing each day. Charges and discharges are gradual.

Oh I forgot: now that the Champions League matches have started (have you watched FC Twente-Inter Milan BTW? :D) I use FotMob 6.0 which syncs continuously via APN for a few hours a day.
[Desire General] siliconaddict:
What tool are you using for the graph BTW?
[Desire General] Muuhmann:
You mean by this, to repeat the OP's procedure, right? Not letting it run dry, right?

I used the Battery Graph App and exportet the values to a csv file. Imported them into Excel and created the Graph manually.

No fancy app to save the graph straight from the desire =(
[Desire General] siliconaddict:
Funny :rolleyes: Yes, the procedure.
[Desire General] Muuhmann:
haha ^^

ok, just wanted to be clear.

not that i mess something up here :D
[Desire General] ruleamsterdam:
Couldn't you just use a screenshot app like "shake it" for that?

damn....that name isn't right :(

Forgot what it's called but when installed it takes a screenshot when you shake your phone, pretty easy.....now to find it ;)
[Desire General] Y.T.:
ShootMe does that, for instance (needs root). But there is at least one other app.
[Desire General] Muuhmann:
screenshot does this too

but yeah, simply didn't think about it.. also, it would not have been displaying the whole graph since unplugging.
[Desire General] ninjakettle:
Ok, going to give this a go. I'm on the pre-rooted 2.2 Rom with radio .23 and finding i'm losing 10% an hour which sucks.

It's a real pain doing this when you're colour blind by the way. Keep having to ask people at work if the light is green yet :)

Will update with result later - should be easy to see a difference in my case as the battery levels are dropping before my eyes at the moment.

*Update - Followed procedure and i'm down to 90% after 1.5 hrs. I guess that's a little better, but nothing like what others are seeing.
[Desire General] Jgruar:
Downgrade your radio, .23 has a lot higher consumption. Also, check your sync/app settings etc. If you are in a bad reception area, consider using 2G only as 3G uses a lot of juice.

Forget this "calibration", it does nothing if theres something actually draining the battery.
[Desire General] Jaa-Yoo:
Hi folks.

What am i supposed to use to wipe battery stats?

I searched the market for "clockworkmod" and found a few apps by developer "clockworkmod" and none of them mention anything about being able to wipe battery stats.

little help please.

thanks :)
[Desire General] siliconaddict:
It's ClockWorkMod Recovery, installed with Unrevoked. Not an app. You boot into it and then wipe battery stats. I believe AmonRa Recovery can do that too. Have you rooted your device?
[Desire General] Jaa-Yoo:
Thanks

I havent rooted my phone and dont plan to. Oh well, thanks anyway. :)
[Desire General] ninjakettle:
Downgraded as you suggested after trying the calibration and not seeing a difference. I'm on .17 now and getting much better battery life. Cheers!
[Desire General] madd0g:
How's .17 compared to .30_2 regards battery life ? I upgraded from .20 to .30_2 and noticed a bit smoother playback of videos, but more choppy video recording/a little less good battery life .. Havent tried battery calibration yet though, ROM is recent stock OTA update ,rooted.
[Desire General] khr0n0s:
Just to add my own 1p. I started having battery issues after flashing a custom ROM. I recalibrated the battery and found that my battery didn't drain as fast, but that also the battery and phone were out of sync. Maybe it had gone too far in the other direction! When the phone would say 6% charge remaining, the battery would report empty and ask the phone to shut-down to prevent damage. I also found that the phone would stick on 100% for far too long after being unplugged. To fix this I used the phone until it shut itself down at around 6%. I then plugged it in and turned it on. The percentage then showed correctly charging from 1%.

The phone now seems to be back to normal. It is draining much more evenly and what the phone says and what the battery actually has seem to be fairly well matched.

I would say running your battery down to empty all the time obviously isn't healthy. I do think doing it occasionally helps with calibration though. Don't forget that the battery does have safety measures to stop it fully discharging, and fully (over) charging too! So don't worry about occasionally running it down till the phone switches off.
[Desire General] dkline:
battery use

I tried this method twice and found the battery lasted much longer after first calibrated.Next time i charged it though it seemed to go back to normal.Not rooted yet.Would it be because I'm not rooted or have people found this needs to be done every charge cycle?

Any help appreciated.
[Desire General] siliconaddict:
Let the battery drain untill the phone shuts down to recalibrate. Do this a few times. After a few times it should be fine, even without wiping battery stats.
[Desire General] mi3x:
I found siliconaddict's method the best so far, my battery life has improved alot (is it this, or that I have the phone for almost 2 months and, as heard, battery life gets better and better after a month or so). The lowest I went was 4%, but the battery icon showed a broken batt, so I plugged it in after seeing that.

I use the latest radio .23 wit OD .23 as well, but it's not a life-sucker for me, I got 3% drain in almost 9 hours last nite, which is outstanding for me (with juicedefender turning 3G on every hour for 3 minutes to sync, also tasker in the background active).

As a person mentioned before, try and delete your Mms.apk (if rooted, and replace with another sms app - I used handcent), it's always in the background and it sucks the juice out of our phones like a new-born fatty baby. :(
[Desire General] tekomie:
Battery Issues..Advice Please?

Ok.. Ive followed this thread since it first started..I believe that SiliconAddicts instructions are by far the clearest to understand. However, I am having HORRIBLE battery life, even after performing the recalibration method to the "T". Ive performed the calibration several times..to no avail. After calibration I dropped 6% (94%) after 15 minutes...45 minutes later, im at 83%!! the minute i started using the phone the battery starts dropping quickly...mind you that the innitial 15 minutes i barley touched the damned device.

I am running Conaps CELB 2.8 w v5 kernel (Conaps version)

I am not using SetCPU/ Autokiller ( this apps seemed to "chunk" the phone to a crawl...I don't believe the Kernel plays well with these apps.

I also downloaded Overcharger to ensure that i was charging fully to 4187v+, but my phone never charged above 4180...it sat on the charger FOREVER to get this fully charged (never made it past 4180 v)

Does neone have any idea on what I can do to get this fix to work?... mind you at one point... this fix worked...I once dropped 2% (98%) in 1 hour... that was pretty much awesome...
[Desire General] siliconaddict:
Do a full wipe, reinstall your ROM, do NOT, I repeat do NOT install any additional apps, run that battery down untill the phone shuts down and then use the procedure. Do this a few times and then tell us if there is any improvement.

But again, use the bare ROM without any additional apps. Only Overcharged to monitor the charge level.
[Desire General] kitsunegari:
Is this something everyone should do, or only if you're having battery problems?