yashsingh1/xdaforums huggingface dataset:
[Desire General] desire888:
Thanks for that. At what point do you wipe battery stats? After the process is complete?
[Desire General] b3ndik:
Also wondering about this
[Desire General] Lennyuk:
You should wipe battery stats after its fully green (when powered off) then boot the phone back up.

You only need to do this once

I.e.

Charge till full when powered on

power off

charge till full again

boot into recovery wipe stats

boot and continue to use as normal
[Desire General] PStephan88:
It works!!!

That's fantastic!

I read this topic this morning and tried immediately. Since this morning i only lost 4% until now. That's great news!

Thx a lot, man!
[Desire General] desire888:
thanks!!!!

battery usage is much better now!
[Desire General] kmetek:
how do you wipe batt stats? :D
[Desire General] siliconaddict:
Via ClockWorkMod recovery
[Desire General] b3ndik:
Clockworkmod recovery -> advanced -> wipe battery stats.
[Desire General] pa.pn2:
do i have to repeat that in future again?
[Desire General] nico1375:
first post :)
[Desire General] Phily757:
takes a long time to charge my Desire, but then i'll test this one!

Hope this will make battery life better. I have the same problem as described in first post (drops immediatly from 99% down to 93% :( )
[Desire General] xNavyblue:
Can someone suggest me how should I go about doing this if I use multiple batteries?

I'd imagine the phone can only be calibrated to 1 battery. But if I were to use another battery, would I screw up the calibration to the original batteries?

Right now as it is with moderate usage I need 3 batteries to last me through the day. :S
[Desire General] BlackDragonBE:
3 batteries?! :o

What rom are you using and how exactly are you using your phone?

I have just one battery and it lasts about 2 days with moderate use.
[Desire General] xNavyblue:
I am using this ROM: (sorry can't post link)

[ROM] Rooted Official HTC Android 2.2 (FroYo) ROM [Market issue fixed]

With my typical usage, I unplugged the phone in the morning from the charger, by the time I knock off from work, I would have left about may be 20%. With stock ROM and a single battery, there is no way that I could last 2 days with one single charge. My main use is web browsing, RSS, Facebook and IM. My estimation of my solid screen time is about 2-3 hours.

So I bought more battery just in case, and played with custom ROMs. I ended up using up a whole battery in 4 hours or so. Definitely something is wrong here. My gut feel is that both the ROM and batteries are suspects. Being a newbie I really need enlightenment.
[Desire General] Dany0:
Is it really needed to wipe the stats? I think I've accidently done this once already... cause the battery life is much better.
[Desire General] schidddy:
since this procedure, my battery stays at 100% since nearly 2 and a half hours now and i did 2 text messeges in between and recently checked the bat about 4 times

this couldnt be possible..

i mean the battery is almost doubled in comparison to how long it lasts before :D

is this possible??
[Desire General] Dany0:
yes it is possible
[Desire General] schidddy:
but how?

i mean in this time the battery would have been dropped to arround 97

and now its still full?

i mean these are stats how are they increasing battery life? the batterylife is given from the cell itself?
[Desire General] ItsDace:
I noticed the same behavior
[Desire General] kmetek:
Erm you all having FROYO 2.2 right? That's way you all getting such nice battery time?
[Desire General] thefunkygibbon:
yes and .. really? i've not noticed much difference with froyo :( think the whole "battery life better with froyo" stuff was just marketing talk from google :(
[Desire General] hshah:
How does this whole calibration thing work if you have two batteries?
[Desire General] casca:
I've noticed a significant increase in battery time.

I think with this procedure you're basically forcing the battery to charge fully, and recognizing the full charging potential. Maybe if you don't, it thinks it charges 100%, but only charges 95% for example, I don't know...so it doesn't matter how many batteries you've got.
[Desire General] Sleehond:
17 hours and 30 minutes after using the method.

- Mail checks every 15min.

- playing 2 hours in the train (internet and some little games)

- about 5 calls and 5 sms sent/received in these hours

38% battery now left! I think I will be able to get over 24 hours. Hopefully about 30 hours at least.

Normally I was not many times able to get 24 hours.

So Yes little improvement I think :)
[Desire General] ibila:
Hmmm, getting pretty frustrated here.

I was on the latest pays 1.9 rom.

Did the whole calibrating thing, every step from beginning to end.

Not seeing any orange led at all.

Even did the battery status wipe.

"android system info" app not finding any big consumer.

"battery status pro" app telling me the battery is healthy 4197V

Results:

Battery drops from 100% to 15% in 6 hours?!?!?!?!?

Medium to heavy use.

using mobile internet frequently, playing 15 minutes of poker online

no wifi, no bluetooth, no gps, no music, no marketplace downloads.

Im now back to IEFTM's "[ROM] Official 2.2, with: busybox, old A2SD+, OpenVPN (TUN), EXT4 support, 802.11N" and did the whole calibrating and whiping again. Now on black wallpaper and medium screen brightness. Hope it will get better now

Anyone any idea what else i can try?

:o:o:o:o:o

Update:

after 30 minutes with zero apps running, only checking "battery status pro" and "android system info"

and scrolling through my homescreens the battery went from 100% to 97%

Aaaaarg.........
[Desire General] gianton:
Battery life update after the calibration:

24h since fully charged

25mins 3d games

15mins internet with wifi

5mnis calls

4 sms texts sent

82% left!

Wifi/data is disabled as well as autosync. Flightmode for 9 hours.
[Desire General] abnesher:
Ok, I've tested this calibration for 2 days now and I can finally say that it doesn't seem to work on my desire. Yes, the phone tells me that battery is outstanding in the upper end, where it stays at 90-100% for hours. This all suggests that the phone now holds power for a longer time, but....the problem is now in the lower end of the scale:

When my battery indicator turns Orange, I have about 1 hour of battery left. Earlier I could had way more hours left when it hit Orange. So for now it seems my battery is just as sucky as it was before the calibration (it was great before 2.2, but after the update it sucks). So it just seems that the calibration just changed the way the indicator works.

My phone is non-rooted with official ota 2.2 and I never did any rooting on it.

I just checked battery values and it measures 4178mV at 100% and about 3300mV at 24%...does that even sound right?!
[Desire General] roomkokos:
I got Roufianos V6 rom with latest rom (its already cooked in a rom. .20 something in the end. I dont use any speed messing apps :) so its stock 1 ghz snappydragon :)

Right i did a little test to see how does the battery react to wifi. So i disabled wifi over the night and the stats were as follow:

Stopped using phone at 73% at 10:20 pm (night) and left the phone in a sleep mode without wifi on. When i woke up and got ready to go out i checked out at 8:30 and i had 68% And realiesed it took me a bit more than 1% for two hours. That is in a sleeep and no wifi mode.

Right now, its 3 pm (afternoon) - after 7,5 hours my phone went down to 57% (3835 mV)

Battery use: 1d 2h 15 min (58%)

Well i actually didnt really do much with the phone, had only a 2 minute call to my friends so we got together, and the rest, was when my friends "played" with the phone, when they saw i got a desire, so not really much of harassing it :) turned it on couple of times to see the clock, thats more or less it. Oh, yeah i had a stealth recording app on for 4 minutes long audio recording :) me and my buddy letft the table and the phone was on to see if one of the girls had a crush on my friend :D i know it's illigal but it was for the good cause :cool:

(Wifi was off all the time, because we were out on drinks and lounch so no time for messing with phone anyway.)

Remember:

my phone is a "Control phone" which doesnt use this method for calibrating, its a stock battery and all thats custom, is roufianos V6 rom :) its got a 720p at about 22 fps if i recall, they were talking about it on the forum, didnt really use the camera much, not bothred with fps either, its making a very clean video tho :)

(btw, i'm turning my wifi back on now, at 3 PM (noon) because my phone is practically useless without it hehe )

Whats the screen shot app u guys use? its quite tireing to write all these stats, and you guys could see the info u need for urself if i uploaded screens :P

Quite happy with my uncalibrated stock battery to be honest
[Desire General] willexmen:
People with amazing battery after this trick, what roms do you use?
[Desire General] ourfear:
I use OpenDesire, the led turn green color after 90%, should i waiting to 100%? coz the tips said "is fully charged"..
[Desire General] kmetek:
e moj roomkoks iz kje si? :P
[Desire General] roomkokos:
rumkokos, salabajzer :D :cool:

--------------------------------

Update on battery:

Had an hour and 10 mins of talking to do right now, and my battery lost like 17% grrr :)

I did use a bluetooth connection to transfer a 500kb sized file, it all took about 20-30 seconds, from turning on the bluetooth, transfer, and turning it off, and it took me 1 whole %! That is serious drain :P if u have bluetooth on more than half an hour a day, your battery must be very exhausted soon :P

I'm on 39% after 1d 4h 3min and 3786 mV @ 33,2°C.

(wifi still off since last night at 10:20 pm)

i decided to keep it off till the battery goes to 15% when i'll recharge my battery back to 100%

---------------------

One guy on the previous site, said he has stock ota 2.2 froyo. U will probably not be able to root ur phone in quite some time, which will make it impossible for you to wipe stats, causing your phone to have worse battery because it doesnt fill up to 100% at 4197 mV. If u had rooted ur phone, you could wipe stats and reset it to normal value of 4197.
[Desire General] ibila:
Update:

51% left after 4,5 hours with 1,5 hour listening music from the sd-card sending 4 mails and 10 minutes of internet w/o wifi.

Still battery status pro says my battery is all hunky-dory and android system info telling me there is no heavy batterysucker running!

My froyo is melting to damn fast!!!!!

I think im going back to cupcake :)
[Desire General] kmetek:
patience :P

it depends if some apk is draining battery, yesterday UID 10001 drained mine fast, rebooted etc and charged etc....now in 1 day i'm on 67%......
[Desire General] alex_hk90:
MoDaCo Custom ROM r8.
[Desire General] WaveMaster1406:
Thx bro! i'll try it on my HTC dream and i feed you back. ;)
[Desire General] veryjiggy:
used this method, and phone shut down when battery was showing 15%. excellent.
[Desire General] gianton:
Mine shuts down around 7-8%.
[Desire General] webber2109:
Mine shuts down at around 12-13%

Looks like this method is just an "illusion" to make us think our battery last longer
[Desire General] gianton:
Yes and how can we rollback? :mad:
[Desire General] alex_hk90:
Same here.

However it's still a LOT better than before - from 10-12 hours to around 36 hours.
[Desire General] live_0978:
Yea right, so you're saying your battery went from lasting around half a day to now lasting around a day and half? Look everybody, his battery is lasting triple the standard uptime! This is unbelievable, I've done the calibration method and I can't get the magical 4197mV, I can only get it upto 4053mV, it will last from around 7am til 11pm and even if I don't use my phone all day I'll only get an extra couple hours or so.
[Desire General] elvis56:
Quite a few differences in the battery life people are getting. I am getting 36 to 40 hours with normal use(using setcpu with screen off profile. I am using Leedroid 1.8 rom. A tip that may help some people: after disconnecting my phone from the charger i always kill all running tasks with taskkiller/taskmanager.

From my experience I'd say one could expect about 2% battery loss per hour with average use connected to 3G all the time.
[Desire General] roomkokos:
Try this:

Plug your cable in wall socket and charge your phone. Use Spare parts app or type the *#*#xxxx#*#* (where xxxx are the 4 numbers i cant recall right now, maybe someone knows?) right, what am i talking about u must have some look at the mV :) ok, now stay at the phone when it hits from 99 to 100% (dont mind the green light) at the point when it hits 100% check the mV. If its not 4197, reboot in recovery and wipe stats and reboot again. (so all u do is wipe battery stats) and check the mV again without pluging it in. If is shows less than 100% and less than 4197, plug the cable back in the phone and charge it to 100% again. when it hits 100%, unplug and refresh stats. Unless ur battery is messed up, u should get 4197.

Would help if u get some buddies desire to switch bateries and compare stats on eachothers phones with switched batteries.

----------------------------------

My battery stats - FINISHED

1d 12 hrs 15 mins since last charge @ 23 % left (had to refill because of an emergency, need my phone up and running now) at 3779 mV

1 d 9 hrs 40 mins idle time

2 hrs 40 mins voice calls

less than 10 sms

first 8 hrs wifi

(didnt use the phone for up to 19 hrs when i was sleeping)

I never calibrated anything, i just wiped stats when i flashed my rom when i wiped cache, data, dalvik, i wiped stats too. And my batters just lasted 1 d 12 hrs 15 mins, and had 23% left, but wifi on only first 8 hrs and 2 hrs 40 min of voice calls

Edit:

recharged my phone, checked battery stats it said 100% and 4197 mV, but when i unpluged it it jumped to 4206 :P
[Desire General] weretiger:
tried this...... did that last night and went to sleep around 1130pm. woke up @ 7am and its 100%, did some sync (mails, gCalendar, weather, RSS news) and its still 100%.

Play around with Markets... read RSS, mails...

Now its 920am and drop to 99% only! :)
[Desire General] talhamid:
1 day and some hours? with 8 hours of wifi? Are you kidding us?

Amazing. I'd like to find out what ROM you are running. I was on LeeDroid 1.8 but found it to be a battery hog as well as prone to freezes (sorry) so switched to another one. I also did this whole exercise. No matter what I do, the battery can't seem to go beyond 8 hours with JuiceDefender assisted 10 minutes/hour Wifi, some web browsing, close to 0 phone calls, 10 SMS, as well as SetCPU for screen off. JD claims it has multiplied by 2.08.

ARe all these programs lying? What in the world did you guys do to achieve such fantastic numbers?
[Desire General] SnowToad:
I have a Legend and haven't used this calibration, but here's some stats to compare:

Using stock 2.1 rom, unrooted (no SetCPU)

2d 7h since unplugged = 55 hrs

16h 7 min WiFi (24% batt usage)

Some 3G internet

used the camera, battery stats says camera was 24% battery usage.

3.5hrs display on

A few quick calls

A game for a few minutes

Autosync enabled

Some Web surfing

Facebook

Plenty of SMS

SMS + call notifications on vibrate + tone

Installing/uninstalling apps

Right now it's on critical low battery. Still pretty satisfied..
[Desire General] thecaptain78:
Works great! Thanks!
[Desire General] gianton:
Yes a lot better, we just have to put it in charger before reaching 10%
[Desire General] tommo123:
to clarify,

are people doing the whole stats wiping as well? or simply doing what is in the OP?
[Desire General] phrenzi:
While on, I charge to green led, then I unplug it, power the phone off, then charge to green led.

I find that it charges for at least another 5-10mins before it hits green again (that shows it needed to be recalibrated).

I then unplug it, power on to recovery, wipe battery stats, and reboot.

;)
[Desire General] nitrox1:
This method does not make sense.

Surely you have to teach your phone what zero is!

Everyone getting excellent battery life is because, the phone doesn't know what zero is, therefore shifting the scale, so that a full charge only lasts till around 10%.

I am trying the other way round, wait till phone dies at around 10%, then reset battery stats, and then fully charge. And no fancy charging way, just phone on and on mains charger.

I will tell you how it goes.don't think it will give me any more battery life, but at least the phone will shut down at 0%, not 10%

Sent from my 8-bit ZX Spectrum using semaphore.
[Desire General] veryjiggy:
Exactly! I would rather have my phone NOT stick at 100% for ages than have it conking off when there is still 10% battery left.
[Desire General] WeeJockMacFeegle:
For the procedure as initially described you don't even have to. That's just something somebody else added as a personal embellishment.

I didn't wipe the battery stats on my rooted phone and I still saw the benefit.

I am puzzled as to why you're in a forum about custom roms when your phone isn't rooted.

I only started seeing this issue after I'd applied my first custom rom. Stock battery life was just fine.
[Desire General] casca:
done it this also tonight...

after having the phone turned on for 4 hours in 3g network mode, with 2hours of wifi on, couple of e-mails received and 1 phone call, dropped from 100% to 97% lol nice
[Desire General] r47z:
Doing this "fix" one more time!
[Desire General] talhamid:
i don't get it. I just re-calibrated the battery, and yes it went for around 15 mins after power off and re-plugging. Now it shows 100% and 4187 mv.

JuiceDefender is on, pinging wi-fi/edge (as available) for 10 mins every hour. SetCPU profile is active, dialing CPU down to 245 MHz after screen off.

Running custom Froyo ROM (NextSEnse), appears reasonably fast and keeps around 100 MB of RAM free at ALL times, so must not be a battery hog (can't say for sure through).

The JuicePlotter widget shows around 8 hours of battery remaining. Fell 2% while I typed this post.

Any ideas guys, esp from those enjoying 2-day battery spans? Am I missing something?
[Desire General] Snowtoad23:
Ok well my Legend lasted another hour on critical battery.

That brings it up to 56 hours, so 3 full days at work

See my previous post for details
[Desire General] kevinlow:
i did this yesterday and it works for one day..after that the battery went back as usual..and i did it again just now and will find out whether it will works for tomoro or not..
[Desire General] roomkokos:
No i'm not kidding you, i had wifi on for first 8 hrs and then decided to disable it for the rest of the time. and lasted for 1d 12 hrs. I'm using Roufianos V6 rom and no calibation fixes or anything, just full 100% charge and i unplug it then.

Tonight i charged my phone to 100% at 2:30 am and woke up at 13:30 pm which is 11 hrs after and my phone was on 96% (wifi off) so i calculated and at that "speed" of % i think you can get around more than 300 hours of standby like it says on gsm arena's battery stats for desire. So absolutely all away full standby might really last 360 hrs but thats an extreme waste of this desirable gadget :)

You get more than 300hrs out of this gadget , you maximize the irony to its limits, as you have no desire for a Desire whatsoever ;)

Btw, one guy was making a list of questions, one was

"why are u doing in a custom rom forums, if you have an un-rooted phone" - the answer is - most of the people saw this threat on First page of the xda site saying Calibrate your HTC desire battery, and didnt mention it should be rooted.

Oh btw, from what i can tell from reading these posts... i think this whole calibration stuff just messes up the batterys display - it lasts on 100% longer and goes doesn to 90% slower, letting u guys think its still fully charged, but in reality its already at below 90%. So its more of a placebo effect for you guys than real improvement.

Like i said, i got more battery life when i just wiped stats when i was flashing my rom and cleaning all other data and cache and dalvik as well. And my battery dies somewhere below 4% (last time i checked my battery was at 4% then using it a bit and it died but wasnt on the screen to see that % was it, i imagine 1% :D)

But i do start recharging my phone at 15% well at least when it turns red or shortly after, not because it was to die soon, but because i actually want to USE my phoen when i need it, and i can only do that with battery full and not dying on me, when i need the phone :)

Again, what screenshot app u guys using? It would be so much easier for all of us if u posted screen shots for u guys, would help me type less and believe u guys more :)
[Desire General] casca:
well...i don't know about that, but i know this...

1st my phone is always in 3g mode, and I have setcpu working when the screen is off(only runs at 245mhz )

So...

Unplugged the phone at 6:15am when I woke up, at 8:00am turned wireless on and it has now ran since charged for about 9Hours, and i have 87% juice left.

I have received/made about 2/3 calls , received a couple of sms, and gmail is constantly notifying me about received e-mails.
[Desire General] Naphtaline:
Going to test this because I am really far of your reports... My battery is out almost every evening.
[Desire General] keeyie:
so when do i need wipe battery stat ? from begining ?
[Desire General] webber2109:
My phone auto shuts down at about 12%.. how do I roll back so that it shuts down only at 4 or 5%? Please response..
[Desire General] roomkokos:
No idea. Best thing that comes on my mind is reverse the whole process.

Meaning:

Get the phone to auto kill itself at lowest battery. Then try to boot in Recovery and wipe stats. If it is so empty it wont get to the wipe stats menu before it dies again, plug it in a charger and go to Recovery again. UNPLUG the phone before you wipe stats, when its done, plug the cable back in and reboot your phone from the option in menu. And after that, i guess all u can do is wait, till it charges a bit and watch when it goes under again.
[Desire General] keeyie:
errm wipe battery stat after full charged when power off?then reboot ?
[Desire General] jastonas:
I have the same problem with my phone going off at 14%. If i try to go to recovery, wipe stats.. and battery dies again while wiping stats??

How dangerous is that?..
[Desire General] vidmas:
today I can confirm, that my desire stands by 2 days! I talk ~1,5h, made a ~30 foto, checking mail by wi-fi and gsm, and send a ~30sms.

ONE thing I see, we dont need to owercharge a phone, before night I take out from a charger, and in the morning I found 100% of batery! after 7 hours!