[Epic 4G General] jeremyglass:
I have been on these threads for about 2 weeks before I got my 2 epics. In just about every thread there is someone complaining about the horrible battery life on the epic. Well I am here to rescue you....The combo of a modified Kernel and a task, data killing app is what will extend your battery life and here is how you can get there. I am easily getting over 12hrs with moderate use (texting, 7-10phone calls, and about 1hr of gps use). On standby yesterday (2 phone calls and 20 texts) I was still at 57% after 13hrs off the charger.

The current setup I am on is:

Rooted

Boss Rom V2 with mixup's Kernel.

Ultimate Juice defender. (says 2.00x battery right now)

Spare Parts.

SetCpu. (on demand setting)

My gf has the same phone and she is running about the same battery life 12-14hrs on:

Rooted

Mixup's Kernel

Ultimate Juice.

Where to start?? Well first some might think "rooting" is hard to too "techy" for them to do and trust me it def not.

1.) My advice for completing the root is at this link...easy, easy walk through: http://xdaforums.com/showthread.php?t=786879&highlight=click+root

It seriously takes 5 minutes to complete. Make sure you have USB debugging on under settings/ development (on phone)

2.) Then you should proceed to again another simple "one click" clockwork recovery found here: http://xdaforums.com/showthread.php?t=782300

Once you have tried the runtryfirst or runtrylast. Power off the phone and hold volume down/ camera/ and power until it powers on....if is says andriod recovery repeat what is says in the thread if it says clock work you are good to go to the next step.

3.) Install a rom (if you would like) or if you dont want to change your settings, back up your contacts/ apps, then just install the Kernel:

http://xdaforums.com/showthread.php?t=786988

Once you have gotten this far you can check for the kernel: Settings/about phone/build number should say Mixup Custom Kernel somewhere

Here is another guide on the rooting process:

http://xdaforums.com/showthread.php?t=798067

First download juice defender from the market (free), then download this: http://www.megaupload.com/?d=44E7V14C

With ultimate juice you can change everything you cant with juice but you have to have juice installed first. Here I have everything set how I want it (sleep mode, wifi distance, allowed apps, etc)

Copy/cut to memory card then open/install with Astro

Then download spare parts (if you want, tells you battery history, speeds up amination, etc)

Then download this:

http://xdaforums.com/showthread.php?t=505419

Copy/cut to memory card then open/install with Astro

I am currently using on demand and getting the battery life stated.

Last but not least: Go to settings/ Apps/ running services/ press on OmaDRMconfigService.drm and Stop it. Every time you reboot you have to repeat unless you go here: http://xdaforums.com/showthread.php?t=794010&highlight=DRM

I did ALL of this to my girlfriend's epic within an hr. It might seem like a lot but when 2pm rolls around at work and you are searching for a charger you might want to consider trying this!

The one day I was on my phone most of the day (2hrs) with 1hr 30mins gps use and 100texts at 5pm I was down to 15% but still made it home!

Good luck guys and hope this helps everyone in distress about the battery life!