yashsingh1/xdaforums huggingface dataset:
[Desire General] :
When i tried it, the LED never turned red after disconnecting/powering off. It was green instantly all the time. But i think that somehow my battery calibrated itself after charging it yesterday. Yesterday it hit 15% after 16 hours of standby (1 hour use), today its at 92% after 12 (almost 13) hours and 30 minutes use.
[Desire General] Fightspit:
What about the new battery management app called "Battery Booster"

http://downloadandroid.info/products/utility/battery-booster-boost-your-batterys-running-time/
[Desire General] siliconaddict:
Green LED does not always mean it's fully charged

It's been posted all over this forum already, but here it is again:

A green LED does not always mean the battery is fully charged!

More important is the voltage. You really need to charge untill the voltage is at least 4187mV! Use a tool like Overcharged or Battery Indicator to monitor this.

A green LED does not automatically mean that the voltage is good too. I've had a green LED at slightly over 4100mV in the past, but now that I have recalibrated using the procedure posted here the voltage will reach at least 4187mV and even 4206mV (see screen dump)!

A higher voltage means in practice that the battery will take longer to discharge (= longer battery life), a lower voltage means that the battery will discharge a lot quicker (= shorter battery life)! I honestly don't know why but the difference between the two can be quite significant!

Also, in my experience it's better to let the battery drain close to empty (5% or less) and then charge. I know this is not always possible. Constantly discharging and charging shortens battery life too I have noticed.

I can get 2 days with one charge (average use).
[Desire General] PTKDev:
I have 4.123V is good?

I used this tweak and my voltage is now 4.123V, first are 3.980
[Desire General] siliconaddict:
Wow, very good, I never have had that. And how long does a battery charge last? A full day? Longer?

Note that you may have to repeat the procedure a few times, let the battery drain close to empty (5% or less) and then charge, let the battery drain close to empty (5% or less) and then charge.
[Desire General] bandit_knight:
Is there any way to wipe battery stats on a non-rooted, stock rom? My LED goes green immediately after re-connecting a charger to a switched off phone so I am unable to fully follow the calibration procedure. Whe I start using the phone when it is newly charged the battery level drops pretty quickly.
[Desire General] Adevem:
my battery seems to be awesome after this! 27 hours in and 51 percent! sadly I've rebooted my phone so I can't post stats. I did the op's method without wiping stats.

texting the whole day (with swype too)

some calls, total under 20 minutes

random internet(fb, twitter and stuff) and gps

0% battery drain overnight with gmail account sync on only.

shall monitor again tonight.

great so far!
[Desire General] talhamid:
Wow amazing. Can you confirm whether you had wifi /data on all the time?
[Desire General] willexmen:
Can you explain your procces, i would really apreicate it :)

When do you, wipe, how long did you load, did you wipe many times, do you have to wipe? I want to know everything :)
[Desire General] roomkokos:
Hmm i get between 4197 mV and 4206 at 100% charged.

Btw, dunno whats with my battery, forgot to drain or something?

It took 1% per hour, so after 24 hours i had 75% left.

Now, after 1d 17 hrs and 30 mins my battery is at 50%

10 hrs and 31 mins of wifi syncing weather and friendstream (i have wifi off the rest of 1d and 7 hrs)

40 mins of voice calls

12 sms's

Note: i didnt not calibrate my battery - its a stock battery without any modifications. I just charge it to 100% and unplug it when full. Meaning when its full for the first time, i dont charge it over night.

(If anyone wants to know anything more, i can send screenshots, just tell me what program us guys use for screenshots)
[Desire General] Adevem:
yep I have 2g/3g(auto mode) on every minute. heading to bed soon, gonna check if it drains.
[Desire General] roomkokos:
No u have to have rooted phone and custom recovery for wiping stats.

Download Spare Parts from the market, and check your battery info. If it says 4197 mv or somewhere near that, your battery is fine and dont need calibration.
[Desire General] siliconaddict:
This is the procedure that works for me:

The following steps should significantly extend the battery life on your phone:

1. Let the battery drain close to empty (5% or less).

2. Connect the phone to the charger (AC or USB, USB is better) while powered on and allow the phone to charge until the notification LED is green, indicating the device is fully charged and untill the voltage is at least 4187mV. A higher voltage like 4192mV or more is even better. Use a tool like Overcharged or Battery Indicator to monitor this. Note that a green notification LED does not automatically mean that the voltage is good too.

A higher voltage means in practice that it will take longer to discharge, a lower voltage means that the battery will discharge a lot quicker! The difference can be quite significant!

3. Disconnect the phone from the charger and power it off.

4. Reconnect the phone to the charger while powered off and allow the phone to charge until the notification LED is green. The notification LED may turn green immediately. Leave it on the charger for another hour.

5. Disconnect the phone from the charger and power it on.

6. Once the phone is powered on completely (has restarted fully) wait 2 minutes and power it off again.

7. Reconnect the phone to the charger while powered off and allow the phone to charge until the notification LED is green. The notification LED may turn green immediately. Leave it on the charger for another hour.

8. Leave the phone on the charger and reboot into the ClockWorkMod recovery menu and wipe the battery stats via -> Advanced -> Wipe battery stats.

9. Disconnect the phone from the charger, restart the phone and start using it as normal.

From then on always let the battery drain close to empty (5% or less) as often as possible and then charge untill the voltage is at least 4187mV. A higher voltage like 4192mV or more is even better.

Normally you will have to do this only once. However, on all Android ROMs, if you flash a ROM while charging or during the first boot screen on, first boot mucks up the levels Android thinks the phone is at, i.e. Android will think you’re at 100% when maybe you’re only 90% or whatever. So in theory you will need to repeat this every time you flash a ROM while charging!

Better is to make sure the battery is charged before you flash a ROM and just remove the USB/charge cable before you flash a ROM. Put it back in (if you must) after the first boot screen (when the custom screen or whatever shows).
[Desire General] Stretlow:
Does it not stop charging once the green light comes on as mine gets to 4167, goes green then doesnt increase anymore?

Stret
[Desire General] s_piccand:
Same for me. What I did was to turn it off again, charging again (green light on) a few minutes and turn it on and you will see your battery increasing

HTC Desire

..::::..::::..::::..::::..::::..::::..::::..

ROM : LeeDrOiD 1.9 A2SD+

Radio : 32.44.00.32U_5.09.05.30_2

..::::..::::..::::..::::..::::..::::..::::..
[Desire General] roomkokos:
Well i dont think i'm the luckiest person in the world to have such a good battery:

2 days 12 hrs 30 mins = 36% of battery left

It has been on standby most of the time as i'm really busy with studying now so i dont even have the time to use my phone. I had wifi on for first 10 hrs and 30 mins and i've had 40 mins of voice calls and round 15 txt's.

If u calculate, this is a biiiit more than 1% an hour of standby, which means, if i let this phone auto-exhaust itself to "death" it would last around 95 hours - thats like little less than 5 full days. With only standby from start, i think it would last 5 days of standby. Which is still not 360 hours like the stats say, but i guess theres more to that.

When i charge my battery to full it gets from 4197 to 4206 mV.

I got that by doing this:

Before i flashed roufianos V6 rom, i charged the battery to 100% then i went to recovery, deleted all three cache (data, dalvik, stats) AND battery stats. Then i flashed my rom.

OH! The most important thing about the whole process IS: I FLASHED FROM SD card, not with computer and phone connected with usb cable!

I think its essential to do this before you flash a rom, because by flashing you write new stuff into phones working memory. And if u mess with calibration, you get wrong battery info feedback. The process might as well mess with the calibration is flashing the rom connected to usb, because it charges a little and little, just enough to mess up some stats. If you do this often, you get couple of % difference that you normally wouldnt/shouldnt.

I think desire has a great battery capable of lasting more than a day of heavy usage which not many phones can do, as well as sleep in a standby mode for 3 full days and some extra hours.
[Desire General] siliconaddict:
No it does not. On my Desire the notification LED turns green and then the voltage still goes up further. The max voltage I have reached untill now is 4211mV.
[Desire General] bigstoo:
Nooooooo. Don't do this.

Lithium Ion batteries dislike being deep discharged. You are better to keep them topped up as much as possible rather than allowing them to discharge fully.

Old nickel based batteries benefitted from being discharged fully and then fully recharged. This is NOT the case with Lithium Ion.
[Desire General] siliconaddict:
Lion batteries do not like being drained to totally empty (= 0%) and they will get damaged when you do, that's correct.

BUT: you cannot drain the battery of the Desire to 0% because the phone will shut down before it reaches that, leaving a few %!

That's a safeguard.

So yes, you can drain your battery untill your device shuts down by itself and then recharge. I have been using smartphones with Lion batteries for years, have always done this and have never damaged a battery by letting it drain close to empty (5% or less). On the contrary, in my experience you will get a better battery life by discharging/charging this way.
[Desire General] roomkokos:
i agree with this 100%, thumbs up :)

all phones have a certain safety margin true, to prevent damaging the phone when ur phone dies because theres no charger around and u really need to use max od ur phone. BUT in long term doing so, should eventually damage ur phones battery. Its up for you guys to decide.

And remember, messing up with desires calibration ... might just do this: you are now using the backup battery life on you "regular" 100 to 0% range and your battery life may have increased because you use the "extra" that you shouldnt. Meaning - you must now NOT let your phone drain to 0% because you dont have any back up left - coz u already used it.

MAYBE! I dunno if this calibration process works or not, hadnt tried, but i sure do know, that extra battery life dont just come out of nowhere, just by pluging your phone in and out couple of times while booting your phone... Think about it..

EDIT:

3 days 11 hours and 10% battery left. That was mostly standby.

It's a great battery and no calibration is needed ;)
[Desire General] willexmen:
Thank you so much! :)

The thing is when i charge my battery when phone is on the voltage get around 4192, when i then charge it when of and then turn the phone on it lower then 4150 :(

My led always turn green when charging when phone is of, i charge for about 10 min becuse i thought that it didnt charge. Are you sure that is charging when led is green?
[Desire General] siliconaddict:
From the Battery University (and these folks know what they're talking about):

"Although lithium-ion is memory-free in terms of performance deterioration, batteries with fuel gauges exhibit what engineers refer to as "digital memory". Here is the reason:

Short discharges with subsequent recharges do not provide the periodic calibration needed to synchronize the fuel gauge with the battery's state-of-charge.

A deliberate full discharge and recharge every 30 charges corrects this problem. Letting the battery run down to the cut-off point in the equipment will do this.

If ignored, the fuel gauge will become increasingly less accurate."

I rest my case.
[Desire General] roomkokos:
Yea thats true... for the phones without WIPE STATS option. Including the unrooted desire. Battery stats = calibration settings based on previous re/charges. if u wipe that, it resets to 0, letting the phone-battery think its a new battery. For the phones that dont have wipe option, what you (they) wrote, is true.

But note, every 30 charges, not every time to leave the battery fully discharge.
[Desire General] perettigiuliano:
In italy they say (NOT ABOUT YOU BUT ABOUT METHOD, RIGHT OR NOT): CHE PALLE!

Too long and complicated to do!

IN every day usage they don't have the possibility to let device discharge till 5% or less...

BTW wish some one discover a trick to drain less battery then now
[Desire General] Alex-V:
the phone load full to 100 % and than it stop the load and only recharge if you are at 90 (maybe 89) % but this not come from the phone or any rom..it´s hard coded in the battery...look here :

http://xdaforums.com/showthread.php?t=748700

with kind regards..Alex
[Desire General] Alex-V:
sorry..wrong thread:confused:
[Desire General] bytemage:
EDIT: doh, read first ...
[Desire General] Alex-V:
if you mean me with this..i read a post and than another and i wanted to answer....did not realized that i changed the tab (so also the post) before answer...so i think your post is WASTE

sorry..with kind regards...Alex
[Desire General] yasars:
i have the opendesire 4.0 ... when i charge my phone on 90% the led is green ....

i calibrate my batterie ....

display on , i charge 100% , then power off , charge the battery ,,,, recovery wipe battery stats... but the problem is not resolved
[Desire General] fatgooz:
Same problem here. The led turns green à approximately 90%. Wiped battery stats several times to no avail. Well, Iguess I'll have to do with it.
[Desire General] brainstorm87:
Hi friends.

I've been following this thread quite eagerly.

I want to confirm the calibration method WITHOUT ROOTING my Desire.

The steps from what I followed are :-

1) Connect charger when phone is ON - charge till full

2) Disconnect from charger, power it OFF

3) Connect charger when phone is OFF - charge till full

4) Disconnect from charger, power it ON

5) Wait for it to be completely on (media-scanning and all), then OFF it again

6) Connect charger when phone is OFF - charge till full

7) Disconnect from charger, power it ON and use it as per normal

Necessary caveat and info needed :-

1) I download Overcharged, put my phone to charging when it was about 5%, and when the LED turned green, the Overcharged stats showed 100% and 4187 mV.

Does it need calibration then?

Though it drains fast as compared to the success stories I've read here :p

I charged it at 11 in the night, and now at 11 in the morning (after nearly 12 hours), it's at 66%.

(About 6-7 texts, 3-4 calls, 1 hour on Wi-Fi and 1 hour playing with the gadgets) :p

2) If it needs calibration, what voltage should it be stopped at AFTER the LED turns green? As I said, it turned green yesterday at 100% and about 4187 mV.

Hoping to hear from people who've had luck with it. :)
[Desire General] dnitinb:
Anyone has any experience with charging via USB (notebook) instead of wall socket charger in combination with this procedure?

Trying the OP's steps now, curious to see if any improvement occurs... cause rooted yesterday evening and charged overnight. When I unplugged the phone this morning @ 6.25 it was at 100%, but an hour of fiddling around (internet, market, facebook and twitter) has caused it to drop to 80% over 3 hours... we'll see if there's any gain for me with this procedure.

Update 11:00 - Did the whole procedure, unplugged it now @ 11.00 and will see how it'll hold on. current stats:

98% @ 4177 mV

update 12:34 - after 90 minutes my battery is at:

93% @ 4097mV

update 13:34 -

88% @ 4065Mv

Seems to lose 4% every hour.

hmm... not super impressed yet :/

update 15:00 -

83% @ 3952mV

15% in 4 hours. seems like an improvement over my previous numbers (pre-calibration). Not entirely blown away yet, let's see later this week.

update 16:00 -

78% @ 3977mV <-- Huh? (can this be the result of erroneously plugging it in for a few minutes)

more than 20% in 5 hours... this still means recharging every day it seems. :S --> upon second glance... it came from 20% in 3 hours, and now it's 20% in almost 5 hours. This is quite an improvement, like 66% longer. Hmmm.... :D
[Desire General] redrum781:
n00b here so sorry if I'm asking a stupid q: Is it possible to do this on stock froyo desire?

I mean, I can do the whole charging procedure, but how would I wipe batt status?
[Desire General] dnitinb:
from what i've learned in this thread it's not possible to wipe the battery memory of an unrooted device... see other posts in this thread which will confirm this.
[Desire General] bytemage:
Nop, I didn't refer to you. I refered to myself and what I wrote before the edit.
[Desire General] harunjo:
can i do this method on iphone ? :D
[Desire General] kmetek:
i reached the max 4192mV....now in 1hour not % dropped :D
[Desire General] Stretlow:
what did you do after you hit your highest voltage??
[Desire General] LoDRpR:
ok, thanks for this calibrating method; I have tried it but seems unsuccessful somehow. Please tell me if you find something wrong here:

1. left the phone charging overnight -> led green in the morning (of course)

2. unpluged the phone, connected it back to power; led was green directly (didn't show orange at all); left it 2-3 minutes pluged though ..

3. disconnected from charger and powered it back on; powered it off again and connected back to charger. Led was green directly again! (no orange led at all) Left it 2 minutes plugged

4. booted in AmonRa and wiped battery stats, then restart. Battery showed 100% at this point.

5. Connected to my wifi then and sent an email; this took me about 3 minutes. Battery went to 97%..

Am I doing something wrong here? Others report much better results.
[Desire General] honof11:
my max is 4156 :(
[Desire General] kite86:
I'm having some problems too with battery..

Set cpu installed to go 245 when screen off

Yesterday evening before i went to sleep phone was at 97% at 3 am, now after 5h and 45 mins is at 77%, and the phone was running at 245mhz(with screen off, never used it)

I'm with Cyano cm6 rom, i think there's something wrong with my battery
[Desire General] drvdijk:
I have a same feeling.. DeFroST here at the moment, current battery charge is 4157 mV. If my battery drains again today, I'm simply going to try a Sense ROM again..
[Desire General] albert_htc:
I flashed the stock 2.2 rom a couple of days back.

Plugged into charge on Friday night, 100% on Saturday morning.

Minimal use all day Saturday, 10 texts, 2 calls, 5 mins Wifi.

Checking the stats now on Sunday morning I have:

Battery Level: 84

Battery Voltage: 4026mV

Is that about right, good or bad..

Would doing this procedure help me or make it worse... ?

Thanks :)
[Desire General] kite86:
I'm back to leedroid, gonna check it if is better
[Desire General] kite86:
Well after i wiped following various posts

and after 1h30 of standby i'm still at 99%

I think there's something wrong with cyano then, cause i already calibrate battery but now running leedroid seems a very nice boost in battery life
[Desire General] Stretlow:
Can you post exactly what you did.

Im confused as multiple people saying monitor your max voltage with overcharged ive had it up 4211 but mostly get 4197 however if you then turn it off and recharge how do you know what voltage you're on, you could be on 4048 or lower but you wouldnt know rendering that stage pointless surely?

Wouldn't it just make more sense to get your voltage to the highest point, turn it off, wipe the stats, reboot and unplug and use..????
[Desire General] kite86:
I just charged the phone while was on and green led appeared

unplugged cable

Replugged and charged while phone was off (i already had green led when i plugged, i left phone there for 5 mins)

unplugged cable

Switched phone on, till it booted completely

Rebooted in recovery mode, wiped stats

And when i booted phone i had like 4162 Mv, now after 3.20h and 15 mins of wifi browsing/installing apps from market i'm at 93%, but i didn't used the phone except that browsing with wifi and so.., considering that this night without using it (with cyanogen) in 5 h of stand by ate 20% of battery i'm happy!
[Desire General] Stretlow:
Exactly my point, you've not wiped while at the maximum voltage which as im understanding is the aim here.
[Desire General] ruleamsterdam:
20% in 5h standby!? Is that really considered good? Or was that it's use before calibration?
[Desire General] kite86:
I did calibration, but i think trackball died

I heard that when it happens it start draining battery very fast.. Personally i didnt noticed if trackball was dead since i'm not using it so much
[Desire General] Mabili:
I did calibration, and after charge unplugged i have 4211.

And now 16 hours later from 100% to 87%% the battery use is 13%

Is that good of bad? I use leedroid rom and yesterday i have use wifi and play some music.
[Desire General] kite86:
That's kinda nice, i unplugged it at 3 am today, got 4197..

Now i'm at 76% after some 3g connection and installation of program..
[Desire General] albert_htc:
Tried doing this earlier today.

100% at 7:50am today

I've received 2 calls, now @ 14:50 battery level is 98% (4128mV)

Time since boot 7:02:25

Does that seem about right ?
[Desire General] mjaji:
Hi Vidler,

This is helped in my HTC Desire, which I followed your instructions.:)

Now I have extended battery life in my phone, which is lost power only 4% percentage since last 14 hours.;)

I have recommended everyone how to use your instructions.;)

Thanks!
[Desire General] albert_htc:
Update:

@ 16:39 (7/9/10) battery level is 97% (4138mV)

Time since boot 8:50:23

Stats today show:

Battery Level: 91%

Battery Voltage: 4079mV

Time Since Boot: 24:54.42

That seems pretty good to me ! I'm sure you'll tell me if it isn't
[Desire General] BallBrain:
How are you doing this, I did the calibration as well and I get a 1% drop average with sync on and only using GSM network.

Is your sync on?
[Desire General] albert_htc:
I don't have sync turned on.
[Desire General] itshotinhere:
interesting article on lithium ion technology

not sure if anyone has made a reference to this article? this topic seems a good place to throw it in the mix. ;) www.batteryuniversity.com/parttwo-34.htm an interesting read in light of those wishing to overclock (and how best to care for lithium ion batteries generally).

ihih.
[Desire General] cmx1o1:
just did it this morning and battery life definitely improved. usually after i unplug after charging it will drop to 94% after 10min without doing anything...now its been at 100% for 30min.
[Desire General] mmaacc:
Why did you buy a smartphone in the first place when you don't use it? You know there are these Nokia's still around with B&W LCD that last 2 weeks on one charge. Pretty lame synthetic "benchmark" you try to sell us here, not realistic :).