Develop Bugs

Losing battery life....

My daily ROM is vealpak but yesterday I was on cm7 final but I nanded back to vealpak and now I'm losing battery life fast I did the proper wipes even did vr format all zip any idea I use to get great battery life I use nat's 4.3.4 cfs havs more sbc kernel any ideas why this would be happening?
Sent from my PC36100 using XDA App

I know I post this a lot, but after anytime i flash a new ROM, or notice rapid battery loss, I have a battery routine I use, derived from the various conditioning methods on here, that works very VERY well.
1 - The "HTC Method w/10 Time Unplug"
Charge to full, unplug, turn off the phone, charge while off for another hour. Unplug, turn the phone on for 2 minutes, turn it off again, charge for another hour.
Unplug til the light goes off, plug back in til it turns green.
Do that 10 times.
Boot to Recovery, while plugged in. Clear battery stats, boot to system. And wait 2 mins, THEN unplug.
Also, I keep my GPS, mobile data and WiFi off unless I need it. You don't need either of those to make phone calls or texts

Yeah, you probably just need to wipe battery stats, but the method listed above is good for making sure the battery is actually at 100% when you wipe the stats.

Thanks for the help the wipe worked I think I'm going back to nat's 4.3.2 cfs havs more sbc I got better battery on that and for the charging method I would like to try that but I can't seem to put my phone down that long I think I would go crazy! lol
Sent from my PC36100 using XDA App

You don't sleep?? lol
It probably doesn't have to be 8 hours, but I do it overnight, and on a weekend, when I can wake up and not need my phone for a few hours.

[Q] Not sure if I have found a battery drain bug or what

Something I've discovered recently, and I am not sure I can explain it properly, but here goes...
I am running SRF 1.1.1, I don't believe this is the cause of the problem, but probably something that should be stated.
So running SRF1.1.1, I usually get wonderful battery life. I typically use an external charger and swap out batteries when they get to around 10-15%. This has worked well for me.. For the past few days I got lazy, and just plugged my phone in and left it on my desk to charge, no problem. When the battery is fully charged and I unplug it from the charger, I noticed it was rapidly draining.... I am aware that often when charging via the phone the battery immediately drops to 96% when removed from the charger. So this is normal, but I've noticed that after unplugging from the charger I lose about 10% per hour, when normally it may be 1-2% depending on usage.
To remedy this problem, rebooting seems to fix this issue. I have also had success with the airplane mode toogle. I don't see any odd usages showing up in spare parts, but is there any other way I can test this theory?
Thanks!!
Edit: Wanted to add, that this only seems to happen when using the charger cable with the phone. Swapping batteries does not seem to produce this issue. It is only when the phone is removed from the charger.

I haven't calibrated by battery lately and thats exactly what mine does too, I would stick to the external charger because our phones charge excruciatingly slow unless off. Try calibrating by charging to full while on then turn it off and let it charge more and repeat that a couple times then boot into cwm go to advanced and clear batt stats

Is there an advantage to calibrating a battery if it is not being charged in the phone?

This is the TWS bug mixed with no battery calibration.

socos25 said:
Something I've discovered recently, and I am not sure I can explain it properly, but here goes...
I am running SRF 1.1.1, I don't believe this is the cause of the problem, but probably something that should be stated.
So running SRF1.1.1, I usually get wonderful battery life. I typically use an external charger and swap out batteries when they get to around 10-15%. This has worked well for me.. For the past few days I got lazy, and just plugged my phone in and left it on my desk to charge, no problem. When the battery is fully charged and I unplug it from the charger, I noticed it was rapidly draining.... I am aware that often when charging via the phone the battery immediately drops to 96% when removed from the charger. So this is normal, but I've noticed that after unplugging from the charger I lose about 10% per hour, when normally it may be 1-2% depending on usage.
To remedy this problem, rebooting seems to fix this issue. I have also had success with the airplane mode toogle. I don't see any odd usages showing up in spare parts, but is there any other way I can test this theory?
Thanks!!
Edit: Wanted to add, that this only seems to happen when using the charger cable with the phone. Swapping batteries does not seem to produce this issue. It is only when the phone is removed from the charger.
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similar to what i have been experiencing. i enjoyed great battery life with srf 1.1.0. have a 3500mAh battery that i used to get about 48 hours out of, but now it is averaging around 25-30. i do not have anything but the stock battery to swap with, so i do put it on the charger nightly now. i was planning to recalibrate the battery tonight to see if that cleared things up.
what would be a way to fix the tws bug?

I have noticed this too. It seems to srf seems to not like my extended battery. I am lucky I get a day out of it. I some times will plug it into one of my work computers just to bring the charge up a little and it starts flashing red and discharging this is only on my extended battery not the 2 stock ones I have. I have even tried different kernals to see if that was issue it isn't.
Sent from my lean mean drunken machine useing XDA Premium and a 12 pack of Sam Lager

in looking at battery usage in >settings>about phone>battery use>cell standby i see usually 0-5% tws.
one thing i have noticed, though have not tested is that the screen appears brighter, even at the minimum setting than what i remember from srf 1.1.0

Do you have a 3500mah battery? What is the best way you have found to charge it?

I bought a 3500mah extended battery about a week ago. When I got it, I turned off the evo, inserted the extended battery, and charged the device while powered off for approximately 8 hours. I did this for the first few days. Each subsequent charge, I plug the phone in, power it on, and leave it plugged in for approximately 8-9 hours with the Savaged Zen 2.2.1 SBC CFS kernel.
During this period, I was able to get about 12-14 hours of battery under heavy, almost constant usage. With light usage (texts/twitter/trillian) I was able to pull about 40 hours.
In the last few days however, my battery life has halved. It is still better than the stock battery, but not by much. I am able to pull in around 6 hours of heavy/constant usage before the battery dies. Has anyone experienced this? I've looked at all the tips and tricks and don't see anything that specifically addresses how to charge the bigger battery. I was under the impression that 8 hours with an SBC kernel would fill the battery completely.
Should I be charging the battery with the phone off?
PS: I have tried wiping the battery stats and that has not seemed to help.

I personally use http://electronics.pickegg.com/Elec...-for-T7373-Touch-Pro2-6341706512982200005.JPG
It's SOOO MUCH BETTER on the battery! Plus there's never a chance you'll pull it off the charger before it is finished. Just swap between your normal battery and the 3500 back and fourth for the best results. But everyone knows that our phones won't charge the batteries correctly.
A simple search for t7373 battery charger will take you to places to buy this at. DO NOT OVERPAY FOR IT! I got mine in a 20 buck package. got 2 batteries, this thing, 2 screen covers, case, and so on. 3 clear cases. lol bunch of stuff. on ebay.

GreenTea420 said:
I bought a 3500mah extended battery about a week ago. When I got it, I turned off the evo, inserted the extended battery, and charged the device while powered off for approximately 8 hours. I did this for the first few days. Each subsequent charge, I plug the phone in, power it on, and leave it plugged in for approximately 8-9 hours with the Savaged Zen 2.2.1 SBC CFS kernel.
During this period, I was able to get about 12-14 hours of battery under heavy, almost constant usage. With light usage (texts/twitter/trillian) I was able to pull about 40 hours.
In the last few days however, my battery life has halved. It is still better than the stock battery, but not by much. I am able to pull in around 6 hours of heavy/constant usage before the battery dies. Has anyone experienced this? I've looked at all the tips and tricks and don't see anything that specifically addresses how to charge the bigger battery. I was under the impression that 8 hours with an SBC kernel would fill the battery completely.
Should I be charging the battery with the phone off?
PS: I have tried wiping the battery stats and that has not seemed to help.
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Click to collapse
try reconditioning the battery, charge until full(green light) the unplug and after light goes out plug it in again, repete until you get the orange charging light then let it charge fully(green charged lite). see if that helps

dased14 said:
try reconditioning the battery, charge until full(green light) the unplug and after light goes out plug it in again, repete until you get the orange charging light then let it charge fully(green charged lite). see if that helps
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but all that's doing is overcharging it. The average person doesn't have that much time to waste. lol plus the only way it works is if you do it on a daily basis. However, the funny thing is HTC/Sprint actually posted that as an official fix. HAHAHA! It's really just a trick to get the not so smart people to do it and shut up. lol! It's not conditioning it. wait until battery is almost empty then swap battery and let it charge outside of phone. then put back in. ;-)
edit. just remembered. wasn't people having issues fully charging these 3500s? I'm almost sure they were. yeah. the only way to charge them fully is actually outside the unit! I COMPLETELY forgot about that! Did HTC ever fix that issue? I could be wrong. so need an expert in here to give a second opinion. thanks lol

runcool said:
but all that's doing is overcharging it. The average person doesn't have that much time to waste. lol plus the only way it works is if you do it on a daily basis. However, the funny thing is HTC/Sprint actually posted that as an official fix. HAHAHA! It's really just a trick to get the not so smart people to do it and shut up. lol! It's not conditioning it. wait until battery is almost empty then swap battery and let it charge outside of phone. then put back in. ;-)
edit. just remembered. wasn't people having issues fully charging these 3500s? I'm almost sure they were. yeah. the only way to charge them fully is actually outside the unit! I COMPLETELY forgot about that! Did HTC ever fix that issue? I could be wrong. so need an expert in here to give a second opinion. thanks lol
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so you think its better to carry and swap out batteries and reboot everytime plus buy an extra charger. no thanks, i'll do the not for smart people every once in awhile.
edit: dont know havent heard about any issues not fully charging 3500, or if it is better to use stand alone battery charger

charge it however you like.. I see no difference in results no matter how you do it.. the results in life completely depends on use and how much stuff you have on.. Getting in the habit of turning data off and sync, bluetooth, gps etc is the best way to extend battery life. Charging it full is full.. It doesn't make any sense whatsoever to "recondition" it.. when you fill something up.. how does it get "more full" than full.. logic tells you it's complete bs.. unless you want to believe it then I'm not here to convince you of what is and isn't.. Use the system settings toggles to turn your stuff off.. data and sync are the biggest killers.. You'll still get calls and messages.. just turn it on when you actually want to use your browser.. sittin in your pocket is just wasting precious battery..

Thanks for the input. I'm going to hold off on buying a charger and attempt to charge it as suggested in a couple of these posts. If that doesn't work, I'll invest in the external charger and report back.

GreenTea, any updates on this? I just bought the 3500 and an external charger (why not for $5 a piece). I'm wondering if there's any issues charging inside the phone and whether or not I need to wipe batt stats.

I know this is an old issue, but maybe I can add some input:
I have a Seidio 3500mAh battery I use for my Evo 4G (used it in the my HTC Hero first, then in my Evo 4G). I can get roughly four to five days with little use out of the battery (I'm using CM7.1 right now)...until I turn on 4G.
Once I turn on 4G, I may get eight to ten hours out of it with light use.
What you may want to do is keep the 4G radio off until you need it...this hopefully will improve battery performance.
GreenTea420 said:
I bought a 3500mah extended battery about a week ago. When I got it, I turned off the evo, inserted the extended battery, and charged the device while powered off for approximately 8 hours. I did this for the first few days. Each subsequent charge, I plug the phone in, power it on, and leave it plugged in for approximately 8-9 hours with the Savaged Zen 2.2.1 SBC CFS kernel.
During this period, I was able to get about 12-14 hours of battery under heavy, almost constant usage. With light usage (texts/twitter/trillian) I was able to pull about 40 hours.
In the last few days however, my battery life has halved. It is still better than the stock battery, but not by much. I am able to pull in around 6 hours of heavy/constant usage before the battery dies. Has anyone experienced this? I've looked at all the tips and tricks and don't see anything that specifically addresses how to charge the bigger battery. I was under the impression that 8 hours with an SBC kernel would fill the battery completely.
Should I be charging the battery with the phone off?
PS: I have tried wiping the battery stats and that has not seemed to help.
Click to expand...
Click to collapse

You need to download BATTERY MONITOR WIDGET. Put the widget on your home screen. Monitor voltage while charging. Full is 4200mV. Anything less is not full. Recently, i can not get it past 4180mV. Sometimes, I charge overnight with phone off, then plug into my car charger going to work with phone on to try and top it off.
Calibration nor conditioning will fix the issue. It is the kernels and they just are not right yet for gingerbread.
Sent from my PC36100 using XDA App

With moderate to heavy use I'll be able to pull in 12-15 hours on a full charge with my 3500 mah non-seido battery. Light usage will net me about 40-48 hours. SBC seems to give a couple more hours if the phone is plugged in and turned on during charging. I live in an area without 4G, so I cannot respond to 4G battery use. I've heard it is a battery killer though.

Please someone make an SBC Sense Kernel for Synergy

Please, please, please. SBC kernel for Synergy?
I am tired of my 3500 battery running out after 18 hours, I was getting 60 hours from Warm 2.2 RLS5.
Sent from my PC36100 using XDA App

SBC wont give you better battery usage, just an extra 10% when you wake up. I highly doubt your 18 will turn into 60 just because of SBC alone.
Sent from my PC36100 using xda premium

Warm 2.2 was a great rom.that rom gave me the best battery life I have ever had except for my current setup...I am on wifi once I got home but 8 fairly rough hours on 3g. The wake time shows I used it.
I did get better life w froyo though. I could get 40+ hours pretty regularly and half would be 3g. If I stayed on wifi I am sure I could get 60+ currently.

Lithid, with all due respect, but I am on Synergy. When I charge my phone until the green light comes on, i unplug it and it drops from 100% to 80% in about an hour.
So I tested some things out. I ran battery clear dead and recharged, phone on, and then when the light turned green, I rebooted it and when it booted back up, battery monitor widget said I was at 79%.
Ran dead again about 12 hours. Recharged, phone off, until light turned green and turned on phone. BMW said 78%.
I am not very smart, but both times it took 2 hours exactly to recharge until light turned green. That is telling me that the phone has a timer, or shuts down charge at a certain voltage. It also tells me that it takes the same amount of time to charge my 3500 battery as my old stock 1500???. I call BS!
With SBC, it took 3 hours to fully charge my 1500, and almost 6 to charge my 3500. So what you stated above, makes no freaking sense to my stupid arse. Please re explain to me again how I was not getting 3 days of use before and only about 17 hours today with screen on time of 3 hours today....
Sent from my PC36100 using XDA App

I don't know what you guys are doing to get such terrible battery life. I get 19-20 hours with moderate use out of the stock 1500 battery.
Sent from my PC36100 using Tapatalk

So this morning, I unplugged at 9am from charger. I turned off everything that makes an EVO an EVO, like Background data, and sync so that it does not update any fb or email or anything without me doing it. I have had WiFi on since then and I have it set in Spare Parts to never while plugged so it will shut down when the screen is off. I also turned off Mobile network always on. so I now have a NON EVO, EVO. And at 5 hours, I have 71% battery left. That will get me to to about 17 hours of drain time. so far today I have 2 hours online with it. The 17 hours is purely estimate as I may go 5 hours later without picking it up. so I may be more like 24 hours on this charge cycle.
That is no where near what I was getting with SBC and RLS5 of 2.2. With Synergy, I am not expecting the same run time as before, but with SBC, I would definately be getting WAY MORE life out of battery. 2 days at least.
All I am saying is the the EVO without SBC, DOES NOT fully charge my 3500mA battery. PERIOD!

eggsack said:
So this morning, I unplugged at 9am from charger. I turned off everything that makes an EVO an EVO, like Background data, and sync so that it does not update any fb or email or anything without me doing it. I have had WiFi on since then and I have it set in Spare Parts to never while plugged so it will shut down when the screen is off. I also turned off Mobile network always on. so I now have a NON EVO, EVO. And at 5 hours, I have 71% battery left. That will get me to to about 17 hours of drain time. so far today I have 2 hours online with it. The 17 hours is purely estimate as I may go 5 hours later without picking it up. so I may be more like 24 hours on this charge cycle.
That is no where near what I was getting with SBC and RLS5 of 2.2. With Synergy, I am not expecting the same run time as before, but with SBC, I would definately be getting WAY MORE life out of battery. 2 days at least.
All I am saying is the the EVO without SBC, DOES NOT fully charge my 3500mA battery. PERIOD!
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I agree 100%. I wont use any sense 3.0. Gb rom until an SBC kernal is available. I myself wouldn't use it but my gf would. I'm a cm7 person and only use SBC cause I need every drop of battery life possible. Without SBC I get that initial drain and I wont sacrifice that. For me its safe and a must have and people can disagree with me all they want on the validity of SBC but I believe in it and won't change my mind. If I ever get time I might throw my hand in to creating a kernal but right now I'm working on my apps new release
free the dirk

Nothing wrong with SBC and s reputable replacement battery. Mine is a Seidio and I used SBC for 4 months on 2.2. No problems! Well except only charging every 3 days unlike everyday now.
Sent from my PC36100 using XDA App

update from Today on battery life. I am not at 13h 48min since unplug and BMW says I have 12% remaining and estimates that dead time is 1h05min.
Display time on is 78% and in time that is 5h 48 min.
Wifi on 9h, 8min. I had to make a trip to the grocery store and pharmacy. Dont know where the other 2 hours of time went that it should have been on, cause I did not turn it off.
Phone idle, 7h 55min
I would consider this a normal day. Only about 10 min of talk time. I got similar to this with Stock ROM and a 2600mA battery from Sprint.

If your battery is registering fully charged at 78%, then you must've wiped battery stats without a full charge or something. Charge it fully & then wipe battery stats. Let it drain completely, then charge it fully again. You should get better battery life after doing so.
I've seen in some people's wiping/flashing directions to wipe battery stats (or everything except the SD card), and that's incorrect. Don't wipe battery stats unless your battery is fully charged. Wiping at less than a full charge, or not following through with the conditioning directions, can mess with your battery life.
Sent from my PC36100 using Tapatalk

No, I did not wipe battery stats. How would I get fully charged if the phone will not let it fully charge??? That is my complaibt in the first place. It is NOT charging my 3500 battery anywhere near full charge.
Sent from my PC36100 using XDA App

I was not talking about when your phone is fully charged. I'm saying your battery will still drop the same at 100% or 90% you said at 100% you can get 60 hours. But at 90% your only getting 18 hours or whatever... I was saying, doing that math it doesn't make sense. I also use the 3500 battery. No sbc and I charge to 100% not 78%
Sent from my PC36100 using xda premium

lithid-cm said:
SBC wont give you better battery usage, just an extra 10% when you wake up. I highly doubt your 18 will turn into 60 just because of SBC alone.
Sent from my PC36100 using xda premium
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Gotta disagree with lithid here as well. If you watch the amps separate from the charging indicator, they keep going at max after the charge hits 100% and don't stop until it gets fully charged. For me the full charge without SBC is about 70% of the actual battery capacity

Lithid, I just ask that if you were to unplug your phone when your led turns green. Then do a full restart, BATTERY MONITOR WIDGET will show you your exact capacity charge and it will not be 100%.
Sent from my PC36100 using XDA App

I also want to add....
Lithid, I totally appreciate your interest and I hope I have not offended you or my posts read like I dont care what you say. I try to be respectful, but sonetimes typing out things come across wrong to the reader. You have done some fantastic work for the EVO and I think you are first class for doing it.
You have also caused me to research things so I can learn what you are talking about so I dont come off as an idiot.
The only thing that is troubling me is that I freakin love Synergy. It drains my battery very quickly compared to 2.2. My hunch was that the stock kernel was the culprit. I tried golden monkey and freedom, same problem. I tried chop suey today. I am at 10%, so it is about the same as others. CSuey is a bunch quicker than the others for performance.
So I guess what it comes down to is this; I would just like to try an SBC kernel for Synergy just a. Couple of charge cycles to see if i still get the same endgame. If I still only get 18 to 24 hours of battery charge, I will be a non SBC guy forever. But no one is doing one, so I can not test it. Solution???
And again, Lithid, thanks for your time on this and keep up the good work! I appreciate it!
Sent from my PC36100 using XDA App

Stock 1500 running synergy godmode. Moderate use checking email placed about 15 calls. Checked xda on the hour. Downloaded apps. Browsed the web and listened to music for a few hours. I think your battery might be going bad. Also if you have a taskkiller you need to get rid of it. I let Android do its thing and have had zero battery problems. I easily get a full day and then some out of my EVO.
Sent from my PC36100 using Tapatalk

Small update. All these nay sayers about SBC got me thinking, and the one above that said my battery may be going bad, so I am now back in Myns 2.2 RLS5 and SBC#15 kernel. My old setup. I am going to charge my battery FULLY tonight, and in the morning, I am going to see how long my battery lasts on that setup. I was getting 2.5 to 3 days with moderate use.
Then, when it gets dead, I am going to Recharge it fully and then immediately flash Synergy and then see how long of life I get with a SBC charged kernel and the reflash and see if I get more than 18 hours.
If nothing changes, then I will forever shut up about SBC. If I get significantly longer life, then I will pay someone to do an SBC kernel. Fair enough??

Plugged the phone in to charge at 1:05am today. Light turned green after 3 hrs 15 min. It is still not fully charged and that is at 9 hours 15 minutes. It is almost there. Right now it is showing 22mA charging and dropping. Goal is 0, which means full charge using SBC. I do realize that SBC also charges the battery at a slower rate, but that in itself cannot explain how the phone said the battery was FULLY charged after 3 hours.
So as soon as it gets to 0, I will reboot into recovery, wipe batt stats, then reboot into 2.2 RLS5 and unplug. Then I will run completely down until phone ****s off, then recharge once again using the SBC kernel, once fully charged, I will reboot into recovery, restore my Nandroid of Synergy RLS1 and see how long batt lasts on SBC charge. Then when I run that completely dead, recharge using Stock kernel from synergy and see what happens.

Screw SBC, I'd be happy with HDMw1n, 2-way call recording, and standard speed enhancements ALL in one, stable kernel. We don't have that yet.

Alpine- said:
Screw SBC, I'd be happy with HDMw1n, 2-way call recording, and standard speed enhancements ALL in one, stable kernel. We don't have that yet.
Click to expand...
Click to collapse
This is an SBC thread not a lets ***** about HDMI and 2 way recording which are both out there already thread.
free the dirk

Battery drops 6% when unplugged.

I currently run MIUI on my Evo, and I'm having a problem. My phone will say its fully charged and all, with the green LED saying so, but when I unplug the phone, my battery level drops down to 94% immediatly. What is this? I bought a brand new battery and I still got this problem. Anyone who can I can do?
Sent from my HTC EVO 4G using XDA

You either need to calibrate your battery (app off the market). Or try using a SBC kernel, which properly charges your battery to its full capacity. Make sure its an aosp kernel like mason, or taimat.

Lol sane experience on morning
wanam v10.6 siyah v3.0.1

Definitely needs calibration.Just search for how to properly do it on the forums.I personally use battery calibration from the app store.Charge the battery to 100%,then use the app.Unplug through phone and use the phone all the way until it dies on its on.Then plug it in without turning it on and wait until its fully charged.Turn on and use it once more until it dies.Charge again to 100% then after that you should be good to go.Hope this helps ya.
Sent from my SAMSUNG-SGH-I717 using XDA Premium App

A non-sbc kernel will charge to 100%, then begin to discharge to about 90%, then cycle back up... Depending when you pull the plug, in reality it could be anywhere inbetween that range, so 100 is not a true 100... Calibrating the battery by deleting the bin file doesn't produce any long term results..
A manual way to mimic a full charge would be to charge to 100 percent, unplug, plug back in for a bit and repeat about 10 times, and it should give you a decent charge.
That's a manual way of doing what a SBC kernel does automatically for you

Hey,
Like they said get the SBC, and calibrate your battery, and that should fix it.
I assume at night you are plugging it in till the morning, and this is your issue because in the middle of your sleep it is reaching full and stopping its charge. so by the time you unplug it drops down to how much it discharged.
Charging with your phone off solves this to

Let your phone completely drain till it turns off. Charge the phone while its off till you see the green "charged" light. Unplug usb, wait for green light to disappear and plug usb back in, phone will still charge. Repeat process about ten times. On the tenth time boot into recovery and wipe batt stats, then reboot phone.
Sent from my PC36100 using XDA

Flashed the SBC, and properly calibrated my battery. I'm still at 100% battery level after an hour!
Sent from my HTC EVO 4G using XDA

Good to see that worked for ya. I'd +1 the SBC kernel if you hadn't found that it has been working for you. I've been using Mason's 14 with ICS for a few weeks now and i've found that with the screen off, the battery sits at 100% for quite a while. I haven't used the battery calibrator and maybe i should see how that helps. Does it show significant results or is it mostly a gimmick?

dougfalk said:
Good to see that worked for ya. I'd +1 the SBC kernel if you hadn't found that it has been working for you. I've been using Mason's 14 with ICS for a few weeks now and i've found that with the screen off, the battery sits at 100% for quite a while. I haven't used the battery calibrator and maybe i should see how that helps. Does it show significant results or is it mostly a gimmick?
Click to expand...
Click to collapse
Im not sure what everyone on here thinks it does, but calibrating the battery is strictly for stats. It will not lengthen the battery life or keep it from draining down from 100% faster. All it will do is assure that your battery stats, aka estimated time you have left on your battery, are more accurate.
---------- Post added at 05:25 PM ---------- Previous post was at 05:15 PM ----------
msr4 said:
Flashed the SBC, and properly calibrated my battery. I'm still at 100% battery level after an hour!
Sent from my HTC EVO 4G using XDA
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Click to collapse
good luck. I tried sbc and it was working well for about two weeks, then my battery suddenly started draining super fast. Rumor has it that SBC will in time ruin your battery, which it seemed to possibly be doing to mine. Got rid of SBC, flashed back to build28, ran vipermod script and undervolted -75mV and im magically back to normal.
My findings are that if I just run the stock kernel with build 28, I get the best battery life. As soon as I started trying mason kernel, tiamat kernel, or even faux kernel on build 31, my battery drained too fast for my liking. Thus far I have reached 40 hours on my battery on build 28, with vipermod, stock kernel!

I just got brand new batteries, i have not calibrated nor wiped battery stats after flashing. I do have Mason's kernel and am under-volted by -50. I also have an app called battery xl it helps control what is running when you may not be aware or forget. My battery stays at 100% for over 2hours with minimal use. The only thing i heard is that you have to use the battery down to 10% and then charge while phone is off.Do this about 4 to 5 times and that conditions it(when it's brand new) and it will help your battery last longer before needing a replacement.
Just my .02

Several people have reported bad experiences with the SBC kernels, but there are many more (myself included) that have had absolutely no issues with them and I have used several iterations of the SBC since it was first released for the Evo.
At this point, for me, the benefits more than outweigh the risks. If you do have a problem, buy a new battery. They are pretty darn cheap these days.