yashsingh1/xdaforums huggingface dataset:
[EVO 4G General] srtpusher:
ok, so from reading all of these battery threads, it sounds like this is what may be happening.

the phone prevents itself from over charging and it doesn't trickle charge. so when you leave the phone on the charger it reads 100% due to the display showing the wall cord as the power source. btw my nook running android does this too - if it is plugged in to the wall, it display shows battery at 100%). when removed it drops to what it should be reading after basically being in standyby for however long. HTC's charging recommendation basically tops off the amount that was used from stand by mode.

what would need to happen is when the phone reaches full charge, the charger would cut off completely and the phone wouldn't get power from the charger at all. when the battery dropped to 95%, then the charger would kick back on again to top off the battery. anyone think that due to the tight fit on batteries now, that overheating a battery and the expansion that results could cause issues with tolerance? maybe they are erring on the safe side to ensure the battery doesn't swell up?

just thinking in a textbox...
[EVO 4G General] xHausx:
This method works but is similar to topping off your gas tank, it's not always best to do it. It will cause the life of your battery to be shortened. I'm still doing it myself though, batteries are cheap enough that I'm not too worried about it.
[EVO 4G General] gator2k83:
http://cgi.ebay.com/2-x-1800mAh-bat...ewItem&pt=PDA_Accessories&hash=item4aa2d7fed4

Problem solved.... LMAO

Anyone try these and see a difference looks like the same deal as the 1500's + chager going around ebay but these are red and say 1800mAh
[EVO 4G General] drebbe:
Your right it should only be one cell. The reason they are seeing a change is because the phone is learning the battery curve better. LiPo Charge/Discharge is not linear and is really hard to make an accurate meter. A better way to do this is to let the battery go dead (phone turns off) and fully charge it. After a few times of doing this it should give the same results.

There are three things that kill LiPos: Heat, 100% charge for long periods, and charge cycles (These batteries should have a 300-500 charge cycle).

Its okay to let the phone completely die out because the IC won't let the LiPo completely die. Of course when this happens remember to charge it soon (within a few days) because once a LiPo drains completely they are usually useless.

wiki<dot>cyanogenmod<dot>com/index<dot>php/Troubleshooting#Battery_recalibration
[EVO 4G General] hydralisk:
Nice. I just noticed that when I unplugged my phone after a full 100% charge, it would drop to 90% just after browsing the web for 2 minutes.

So I tried this method, turned my phone back on, unplugged and browsed the web for 2 minutes. Still at 100%.

Now to do this to my spare battery :)
[EVO 4G General] manooti:
this is an awesome find, it boosted my battery performance just enough where its noticeable. something very very weird happened tho. i did the process maybe 20+ times and decided it was enough, just got too lazy to keep doing it.

when i turned it on i noticed my 3g signal is steady now at over 4 bars. before it would fluctuate between 1-full randomly without touching it while its sitting on my desk. i tested it by the window and it was still doing it. and outside my home i ended up in roaming but that was cleared since it needed updating with a sprint techie.

they had no idea why my reception would fluctuate so much and randomly from full to nothing and full again but all i can say is now its steady. i even tried covering up the corner where the antenna is with my hand and it does not lose reception! i know it doesnt and shouldnt make sense but its working so dont jinx it lol

hope phone isnt defective.. evos sold out everywhere so no replacement
[EVO 4G General] X-Kenshin-X:
i am definitely going to try this!
[EVO 4G General] nihilion_Zero:
This works!

I'm a bit speechless. I've used this method for the past three days, and can safely say that battery life has DOUBLED. If anybody knows how to code a solution to this, do it fast and get it on the market. People will pay.
[EVO 4G General] nicholishen:
Wipe battery stats????

Should we be wiping the battery stats in the RA?
[EVO 4G General] xlGmanlx:
just did it myself and have also been stuck at 100% for a few minutes. usually when i unplug it goes to 99/98 almost immeditately. Did we get feedback on if you need to do this everytime you want a "full charge" or just a routine/monthly thing or only once?
[EVO 4G General] jgarozzo:
Must we do this everytime we swap out batteries? I change batteries quite frequently and would hate to do this every other day.
[EVO 4G General] potna:
i do have something unique to add to this discussion but first:

well i can say that i did try this "top off" thing and it does seem to work, but as soon as i discharge the battery though use and recharge that night i was right back in the same boat of having a battery that drops very rapidly in the first 10 minutes or so and then continues to drop faster than it should the rest of the day. so imo, this top it off method only works at that moment, ie, not a long term fix.

also, i charged my evo battery in my touch pro2 and the charge didn't drop rapidly in the first few minutes. Also it seemed to last all day much better then it previously. i was able to play around all day with the phone and the battey drain was surprisingly good.

ok, the interesting thing i observed and i can replicate is:

when using the battery graph app i can watch battery level percentages versus time on a chart. in this chart i observed a charge cycle pattern that has me concerned.

while charging the percentage line on the graph was gradually increasing at a semi steady rate from 0% till 90%, then chagned its charge rate at 90%

heres how it broke down.

0% 114am

90% 309am steady increase all the way to 90%

100% 315am very rapid charge at this stage (probably not good)

basically it had a steady charge rate of .78% per minute untill it hit 90%.

then the remaining 10% rate was: 2.5% per minute.

this last 10% of the charge cycle charges 3.2 times faster rate then the previous 90%. i don't know much about charging but this may be a hint to something that's causing this issue.

also, just how many of us have this issue? all of us, rather we know it or not?

some of use? will there be a fix? is this covered by a warranty or software fix, or so we need to "top it off" every charge?

i'm still within my 30 days and i dont want to swap this out for another if they all have this issue.
[EVO 4G General] bomix:
Worked!

Nice post, it works for me also, still at 100% where it usually drops to 90%

I was amazed seeing the phone still charging while off just after it was charged to 100%
[EVO 4G General] Crossrocker:
Can anyone confirm this?
[EVO 4G General] jerdog:
I basically use the method in the OP and it works pretty well for the stock battery - but I get around 7-9hrs. I decided to switch out the stock Evo battery for the battery in my work oncall Touch Pro2 - it's the exact same battery. This one is older than the Evo stock - but I get 13-16hrs on the TP2 battery..... Go figure. HTC had to have done something with the newer batteries - the TP2 battery is over 9mo old (with minimal use of course)....
[EVO 4G General] Biofall:
Just throwing it out there I have also confirmed this works.

Another interesting note. I clear my battery stats when I'm flashing new ROMs and stuff, and usually it's instant when you hit clear. After doing this about ten times, then, going to clear the stats, it took over a minute. So this technique is logging more battery stats than running a ROM for a month.. Which is good
[EVO 4G General] AdamCole:
I got my EVO a few weeks after launch and this had been a big issue when deciding whether or not to purchase. After experimenting with a few charges, I realized that the battery lasted longer and appeared much more accurate if I never let the battery charge past 100% (or, didn't let the LED go green ever).

It's tough to watch the LED, so here's how my routine for the average work day goes:

Plug it in right as I am about to sleep, the battery is usually around 20%. Wake the next morning to the green light and immediately unplug. Sync some apps and wake it up, as the battery drops rapidly. Then, plug it in to charge (battery usually around 93%) as I go about the rest of the morning routine. If I have time, I try to see the battery hit 100% and power off the device. Early on I noticed that without unplugging, the LED would go from charged to charging upon powering off. As soon as that turns green, I'll boot it up and head on my way.

The problem is I get caught in a loop of booting it, and seeing 99%, then doing the entire process again, lol.

/end rambling rant
[EVO 4G General] jerdog:
I turned the phone on yesterday morning at 7a and when I went to bed at 1a I still had 25% battery left. That's 18 hrs of usage, and JuicePlotter said I still had 3hrs left (and it was 100% accurate on it's meter).... This TP2 battery rocks
[EVO 4G General] aamikam:
this sounded a little like bullcrap... but it actually works.

thanks.
[EVO 4G General] jerdog:
Yeah - I thought that too - but wow..... I haven't switched back to my Evo battery yet.... but may to see if I can get more out of it
[EVO 4G General] kevinjt:
It Works!

I just gave it a shot, and it actually works.

My battery was dropping from 100% to 96% a minute or two after unplugging.

After this method it sustained at 100% for 45 minutes or so ( i took a screenshot of course).

PS: I'm using SetCpu with a under-clocking setting @ Screen Off.

But then again, 40 minutes @ 100% is pretty awesome.

Ill report the outcome of the overall battery life during the day.

Thanks !
[EVO 4G General] jerdog:
For the benefit of others - include the ROM you're using along with the Kernel
[EVO 4G General] kevinjt:
***Correction 40 minutes. :)***

Current ROM CyanogenMod RC2.

Stock CMRC2 Kernel : 2.6.32.15 -cyanogenmod shade@toxygene #1

SetCpu : ScreenOff = 245 - 245

PS: I did a Battery Data Wipe after the 10 plug in plug out procedure using CW Recovery.
[EVO 4G General] rizzoads:
I've seen a lot of "battery tricks" floating around. This one definitely works, but the one I've found to be most effective is to just recharge the battery after the phone has been unplugged for about 15 minutes or so.

The issue is that the phone stops charging the battery when it reaches 100%. When it drains down to 90%, it starts charging again. When you unplug the phone, it could have an actual charge of anywhere between 90% and 100%.

When I get up in the morning, I unplug the phone. After 15 minutes or so, it's usually down to 93% to 96%. Then I plug it back in until the light turns green....

It used to drive me crazy when I was still on the stock kernel and ROM... I'd get to work in the morning and already be down to 85%. Now it's usually still at 100%.. 98% at worst.
[EVO 4G General] nethopper:
OK, let me add some facts to this thread. LiIon batteries are charged with a constant current (e.g. 1 A) till they reach the maximal voltage, typically 4.2 V per cell. Once this point is reached, the charger switches from constant current to constant voltage mode, meaning it decreases the current, maintaining the voltage. Typically, if the current drops below 1/10 or 1/100 of the initial current (eg. 10 mA), charging is stopped. So, if you disconnect the charger, the voltage will drop slightly and next time you connect it, the charger will start its cycle. There is no magic, this is physics and chemistry. A lot of discussion here focuses on subjective observations and placebo effects. Until you take the battery out and measure its capacity with dedicated equipment, arguments are more for entertainment purpose...
[EVO 4G General] letshaveDEX:
I'm abt to try this as soon as I get home. I have done this before and it worked. I rewiped battery stats and attempted other methods but they were all to no avail. Thanks for clearing this up
[EVO 4G General] Golf Nut:
How do you wipe battery stats on a completely stock EVO 4G?
[EVO 4G General] Indiana Jones:
hmm

do i have to do this rain dance every time?
[EVO 4G General] riichiie7:
do i have to repeat this procedure everytime i charge my phone
[EVO 4G General] riichiie7:
this is truly crazy, i thought this would work but not this well, my evo has been chargerd for 12 hours and i still have about90% of battery left, now if only someone could confirm if you have to do this everytime you charge the phone, thankx for sharing your knowledge its is appreciated.
[EVO 4G General] tromano:
can't get the calibration to work?

I've tried doing this, and i don't have a green led just a blue light (goes from red to blue) and have taken it in and out and everytime it drops immediately to 98 or 97...not sure what i am doing wrong or if it's just a crappy battery.
[EVO 4G General] Biofall:
The evo doesn't have a blue led.
[EVO 4G General] issai:
Tried this tonight on my 2nd Epic. Battery Indicator says I was at 100% for a good solid hour! W00t!
[EVO 4G General] itshotinhere:
you're arguing solid science to people who want to squeeze more life out of their batteries and are willing to try anything and everything to do so! good luck ;-)

thanks for the sanity check, nethopper. :D
[EVO 4G General] CyberGhos:
Is EVO's battery is multi cell? I don't think so, but I could be wrong.
[EVO 4G General] Systemfraud:
All I have to say is wow. It worked like a charm. Thank you!
[EVO 4G General] clovis_ll:
it worked for me but after my first battery drain, my battery problem resurfaced. are we suppose to do this every time?
[EVO 4G General] vanstrien:
Yep, it works

I did this once two weeks ago. In fact I did this AND the instructions that are supposedly directly from HTC (charge on, then off, then on and off before another charge).

The last two days my phone went 46 hours on battery but at 10% I decided to plug it in again. Yep, I took it off charger at 8am Tuesday and plugged it back in Thursday at 6am. I plan on repeating what I refer to as the pat-your-head-rub-your-tummy charging cycle about once a month. (I leave wifi on while I'm at home and work. My screen is set to autobrightness. All my widgets have to do with time, weather and my calendar -- I use no widgets for facebook or twitter. My kids regularly steal my phone to play games during the day.)

Last week I had a couple days where my battery life was only about 7-10 hours. I think it was because I installed some apps that must have been chewing cycles or syncing when they should not have been. When I removed them my battery life jumped back up to 35+ hours. LiveWallpapers also crushed my battery although I don't really understand why. They should go to sleep when the phone is off or another app has focus.

So I think this method of charging the battery works and is important, but even more important ditch any app that causes your battery life to go down. They often do not show up as the culprits when I look at the system menu for what consumed battery.
[EVO 4G General] Systemfraud:
Well, damn... I don't know what happened but now it's not really helping my battery anymore. I've had it unplugged for 34 minutes and it shot down to 93% for no reason. I had 3G on for about 3 minutes total... I've already ordered my external charger, will it really help a lot more than these said charging methods?

Edit: what does wiping battery stats do anwyay?
[EVO 4G General] bojackson63044:
I know the directions are for the HTC Evo, but I've heard people say they are successful with the Epic as well so I tried it. I followed the instructions exactly and it's been 15 minutes since I took the phone off the charger - battery indicator is showing the battery at 90%. Looks like it didn't work for me. :(
[EVO 4G General] mrpickem:
Nice...pain it the ass, but it def helped my battery life. THX
[EVO 4G General] lehalter:
Nothing happens when I do the *#*# thing, it just goes away.
[EVO 4G General] kthejoker20:
Remember to donate~!!!!!
[EVO 4G General] lehalter:
How do you know the % of your batter all the time?
[EVO 4G General] autoleno:
i've seen this posted before and i can never get past the dialer entry to the testing mode. I dial the characters as instructed and the phone just sits there. Doesn't take me to another screen. I know you're not supposed to hit call so what am i missing? Would love to see how my phone breaks down here in these settings.

Thanks!
[EVO 4G General] fachadick:
forget dialing the characters - get the "network" app from the market. It's a shortcut to that same radios page you're trying to access
[EVO 4G General] jtw78:
Just trying this out now. It seems to be working and, it can't hurt anything. I'll update with some results. Thanks for this tip.

Running the Epic 4G

Update: I got 15 hours and the battery is at 3%. I turned off all the radios when they weren't in use. I did some 4G browsing and downloading. Some GPS stuff with Google Maps. And some gaming. Fairly typical use for me. I did not use any battery optimizer app. Next I'll try running Juice Defender to see what difference it makes.
[EVO 4G General] Kubernetes:
Just a quick note about why this works. Most people under-charge their batteries during normal use. If you charge with your phone on, the battery will never get a complete charge. You're charging the battery at the same time that you're discharging, so there's some sort of buffer and you'll never top up completely.

If you charge with the phone off, the OS isn't shutting off the current when it decides it's reached 100%. Instead, it's just the internal circuitry of the Li battery that shuts off the hose when it reaches some voltage level (prob around 4.25v).

If you charge with phone off and do the plug/unplug thing, you're both evening out the charge throughout the cell and overcharging it. I imagine if you kept doing this ad nauseum, you could overheat your battery and damage it.

When you turn on your phone after doing this, not only will it read 100%, but it will stay that way for a while, because as far as Android is concerned the battery is over the threshold it assumes is 100% (based on the battery stats it has accumulated over time). This is because if you're like most people, you usually charge powered on, so Android has never seen (or rarely seen) what a full 100% charged battery looks like.

I noticed the screenshot above where the stats show 100% at 4.117v or something like that--my phone shows 100% when I'm at 4.25v or so. In other words, the user above has been missing a decent chunk of battery life because Android has been shutting off the charger long before the battery is full.

My Vibrant currently shows a 94% charge at 4.19v, so the guy at 100% at 4.117v has a very badly calibrated battery meter. I would suggest you wipe your battery stats and do a full recalibration (fill up all the way, turn it on, and let it drain until the phone dies; repeat).
[EVO 4G General] catseyenu:
A search using "network" & "networks" as named earlier, doesn't bring one particular app to to forefront.

Is there more to the name of this app & why doesn't the "Dial *#*#4636#*#*.." bring up the "Testing" menu on some of our phones?

TIA

~cat~
[EVO 4G General] fachadick:
No its just called network. Try a market search for the guys name - mangelow.

Sent from my blah blah blah blah

Edit- you're right, it doesn't come up under network for some reason. But if you search for the guys name and scroll down a bit, it's there.
[EVO 4G General] catseyenu:
Got it, thank you!

Mine was set to CDMA Auto as well, changed to CDMA only...
[EVO 4G General] Adebayo88:
Make sure you get the settings right on that juice defender.....I'm getting 12-18 hrs+ with the app alone (no kernels)....a lot of people just run the app and expect miracles without tinkering around with the settings.
[EVO 4G General] dahauss:
What's the Difference between cdma only and cdma prl?
[EVO 4G General] luimoran:
I tried this and my battery went down 1% in 8.2 minutes...not bad considering it would go down 2% almost instantaneously after disconnected. The process just bought me at least 15 minutes more, but I will see how long the battery lasts today.
[EVO 4G General] electronicopolis:
There is another thread regarding the "cell standby" issue -- "Evo Battery Life Trick Read"

I guess this answers my Q.. I was thinking of going to WCDMA, but I put it to CDMA Only. Is it supposed to FC after selecting it through the menu? I read you're supposed to get a FC if the codes work.. & it is the same screen...
[EVO 4G General] dgcruzing:
worth a try.. anything to squeeze more life out of it..

Thanks for the info..
[EVO 4G General] andrewperez38:
can you message me about your speed
[EVO 4G General] LuvThyMetal:
Yea an app for this battle cycle procedure wouldn't be a bad idea.
[EVO 4G General] a1platnum:
^ this

It's what the BB agent told me about the phone. Once it hits 100% you may as well take it off the charger cause it's done, and just top it off again before you leave anywhere. Haven't had the drop off problem following these rules.
[EVO 4G General] rredix:
It seemed to do my phone a little good, but who knows. Maybe just a placebo effect.
[EVO 4G General] FernandoMiguel:
for those of you running pershoot kernels (for cyanogenmod) , you will find this common.

due to a battery drain in the kernel, very hard to find, sometimes the USB wavelocks are not freed.

So, pershoot, would advice in his blog to do those step, and devices would then have proper life battery.

We always assumed it was in our code tree, but it seems HTC knows about the problem too
[EVO 4G General] exSD:
Tried this with 15 iterations, did not help my battery at all. My battery seems to only charge to 91% (drops rapidly to there from 100%).
[EVO 4G General] triksgold:
I dad a problem~When the LED turns green ,the battery info shows that it has only 93% charged.
[EVO 4G General] Agfadoc:
Do this exercise, run a battery monitor, get the voltage to 4.12 or above if you can, reboot into recovery, Wipe your battery stats in recovery-advanced.

Your Evo seems to be confused at to where 100% should be
[EVO 4G General] Shushunmire:
Wooo! It worked. I hope this is maybe just a once a month thing that needs to be done. Took me about 6 minutes to go through all 10 cycles, but it seems to have done the battery a ton of good. Sitting at 100% for the past 25 minutes. By this time, my battery would normally be at 87%.... And that's a huge drop considering I'm running the Sprint 2600 battery.
[EVO 4G General] exSD:
How the hell do you get it to 4.12... lol
[EVO 4G General] Agfadoc:
Charge the phone normally until green, remove charger, turn it off and charge to green again, unplug and charge again, about 6 times then turn on to see voltage. If necessary, do it again.

Then make sure it says 100%, boot to recovery, and wipe battery stats.
[EVO 4G General] exSD:
Awesome. Thanks.
[EVO 4G General] vkuber:
I followed what exactly what was written and now my Evo does not dis-charge as fast it was previously. Thank you for this information. I think what did it for me was the re-wipe of the battery data in bootloader. I left the phone plugged in when doing this as well.
[EVO 4G General] VisedMonk:
Tried this last week, following the instructions to the letter, and this seems to have worked for me...

Calkulin's EViO 2 ROM v1.6.2 [ FroYo l FRG83 l OC l UV l Themeable ]

Ziggy471 Kernel 2.6.32.25-ck2

Settings:

-wifi, bt, 4g, and gps off (wifi at home, from 6:30 p.m. ish on)

-always on mobile data off (haven't noticed any drawbacks, but I've heard that gtalk may not work right)

-screen auto-off 30 seconds

Typically have about 40-50% battery at end of normal usage for day:

-unplug from charger at 6:30 a.m.

-receive about 50 emails, send 25 to 30

-25 or so texts

-a little facebook via Android app

-some twitter through Twidroyd

-20 mins or so of web surfing

-15 to 20 mins of voice calls

-back on charger about 11:00 p.m.
[EVO 4G General] Perilousp69:
Worked for me

Keep plugging it in for at least 10 times. I got green battery every time except for the sixth time, when I got a red indicator for about two minutes. Seems I finally jarred something loose.