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Root Low Voltage Kernal by ejhart

i'm going on 20 hours up time with 3 hours awake time and i'm at 54%. i'm using an HTC 1500Mah battery that gets charged by an external charger.
 
so today after 12 hours of use my phone is at 82%. i didn't really use it all that much, but it's still really good battery life. better battery life than my overclocked Moto Droid that's for sure.

my usage today so far:

-about 30 minutes of streaming music, about 10 minutes of it was pandora, and about 20 minutes of it was DroidLive. DroidLive is a battery killer, it's live Shoutcast streams if you didn't know.

-maybe 5 minutes of reading RSS feeds from FeedR

-sent and received a couple of texts

-no calls or emails today (nobody loves me
frown.gif
)

-i have FeedR, News and Weather widget, Facebook, and Twitter set to update every 4 hours and i have the htc weather widget set to update every hour.

-GPS always on, and wifi was off

-was getting anywhere from 2 to 4 bars of 3G service all day.

the phone shows 12h 06m up time, 52 minutes awake time

i put a fresh battery in at about 10:30AM and at 9:15PM is was still at 90%. after that my 20 minute ride home from work listening to Droidlive killed off about 6-7% alone. DroidLive is and always will be a battery and CPU hog, but i love it. power consumption at idle is ridiculously good. so i'm going to have to say that the new kernel is doing spectacular. at idle on 3G i'm getting about a 1% drop an hour, maybe even slightly less.
 
Jason,

Which battery are you using?

I have the 2150 and I get roughly 6-9 hours of awake time, with very moderate use (phone calls, texts, browsing, wifi/3G, half or full brightness). But I want it to be better.

If the 1500 OEM can give me about 6 hours of awake time with the above usage and low voltage kernal, I will return my 2150 and be a happy man: I'll either keep my hard silicone case (which I honestly love) or get the Innocase Active. Either way, my phone will still be sleek rather than the tumor that is the extended battery.

Thanks for your report. I'd also love to see another report of moderate (normal) usage and the awake time.

I am too scared to root my phone because none of the methods seem to be reliable (meaning, it's hit or miss for most people) and no cooked ROMs out yet from what I know.
 
Bearly said:
Jason,

Which battery are you using?

I have the 2150 and I get roughly 6-9 hours of awake time, with very moderate use (phone calls, texts, browsing, wifi/3G, half or full brightness). But I want it to be better.

If the 1500 OEM can give me about 6 hours of awake time with the above usage and low voltage kernal, I will return my 2150 and be a happy man: I'll either keep my hard silicone case (which I honestly love) or get the Innocase Active. Either way, my phone will still be sleek rather than the tumor that is the extended battery.

Thanks for your report. I'd also love to see another report of moderate (normal) usage and the awake time.

I am too scared to root my phone because none of the methods seem to be reliable (meaning, it's hit or miss for most people) and no cooked ROMs out yet from what I know.
Click to expand...

oh yea, i'm using a 1500Mah OEM htc battery. i have two 1500's, the stock 1300 and an external battery charger to charge them all.
 
Hmm, the 52 min awake with 82% remaining puts you around 4.8 hours of awake time with the same usage pattern.

Not bad. Still not on par with the extended battery and moderate usage, which is what I was hoping for, so I could keep the slim hard silicone case on.

I'm about to get the 2600 mAh 3rd party battery from eBay ($15) and use the OEM extended battery cover with it. Hope that gives me at least 16 hours awake time (non-rooted), if not 20 hours with low voltage kernel.
 
Question to the forum.

Overclocked increases the phone speed correct?

Undervolted decreases the battery or "juice" used correct?

I'm more interested in keeping my phone cool and running for a long time then increasing the speed so an undervolted normal kernel would be the best?
 
correct. But you have to make sure that undervoltage doesnt make the phone unstable, this may cause battery lost. I am trying them all out and under voltage seems to be working just fine.
 
The overclocked kernels runs the same voltage as the stock 998Mhz would have. Decreasing voltage for an overclocked kernel would just make it more unstable than it already is...

Overclocking was fun but I rather benefit from longer battery life than speed ;)
 
The overclocked kernels runs the same voltage as the stock 998Mhz would have. Decreasing voltage for an overclocked kernel would just make it more unstable than it already is...

Overclocking was fun but I rather benefit from longer battery life than speed ;)
Click to expand...

+1

Can't wait for 2.2, it'll give us lots o' speed, and maybe we'll be able to keep this awesome undervolt kernel or a derivative thereof.

From my Incredible Drooooiiiiiid.
 
Ok guys....My phone was up for 7 and a half hours. I did half an hour of browsing and just overall checking of the phone with system panel and linpack testing and then went to sleep.

I started from 80% and I woke up with 80%. That is freaking awesome. Sure it was mostly on idle but man..that's just sweet. Oh and I am using 1500mah from ebay :p
 
I tried the overclocked non wireless N version and I couldn't use wireless at all. The check box to turn on and my widget didn't do anything. So I restored my latest backup.
 
JETC said:
Ok guys....My phone was up for 7 and a half hours. I did half an hour of browsing and just overall checking of the phone with system panel and linpack testing and then went to sleep.

I started from 80% and I woke up with 80%. That is freaking awesome. Sure it was mostly on idle but man..that's just sweet. Oh and I am using 1500mah from ebay :p
Click to expand...

i had similar results. i went to bed with 78% and woke up about 8 hours later and it was still at 78%. my phone with this kernel with wifi on (and connected) has ridiculously good battery life at idle.

1 day, 7 hours, and 41 minutes on a single charge and i'm still at 50%. only 2:45 of awake time though, but still good IMO.
 
quick qestion...i put the low voltage kernel on my phone...if i want to try the overclock, low voltage do i have to do anything other than install that kernel? any other backing up or anything?
 
BillytheKid said:
quick qestion...i put the low voltage kernel on my phone...if i want to try the overclock, low voltage do i have to do anything other than install that kernel? any other backing up or anything?
Click to expand...

i't's always a good idea to do a nandroid backup before making any changes. remember, you can always back up your nandroid backups to your laptop or PC if you are worried about free space on your SD card.
 
might be a silly question but just making sure , when doing a nanddroid backup , is there anything to take particular notice in ? especially since it says the only to recover from this is if you do one, just want to make sure im doing it right :)
 
BillytheKid said:
quick qestion...i put the low voltage kernel on my phone...if i want to try the overclock, low voltage do i have to do anything other than install that kernel? any other backing up or anything?
Click to expand...

you can flash the new kernel right over top but this might be unstable. I had issues when i did this, so i went back to stock using nandroid backup. then i flashed the OCUV kernel.

running great for me so far. My phone has been up for 40 hours and is only at 41% with moderate usage overclocked to 1152 mhz.
 

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iowabowtech said:
If a person loads this and wants to revert back to stock is a nand restore all that's required? No wipe?
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yes. just use the nand backup. i was worried about this too, but after trying lots of kernels and reverting back a lot you lose the fear.
 
ooz said:
you can flash the new kernel right over top but this might be unstable. I had issues when i did this, so i went back to stock using nandroid backup. then i flashed the OCUV kernel.

running great for me so far. My phone has been up for 40 hours and is only at 41% with moderate usage overclocked to 1152 mhz.
Click to expand...


Looks like you have 3G turned off. That does save a hell load of battery juice.
 
Yep. That last 40 hours was mostly wifi with the occasional 3G excursion out of the house.

Also, I forgot to mention I had a sleep profile running in setcpu to underclock to 245 when sleeping. Idle battery usage was next to nil.
 
Sounds crazy but I seemed to get worse battery life with it installed. I have zero proof however, didn't chart any data before and after. I just went off my typical battery life at various points in the day and I was lower than usual with usage trends pretty much the same. I'm kind of a creature of habit so my days are fairly similar. Using stock 1300 battery tho. Nand restored back to stock.

Edit: browser in particular was killing me.
 
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