Battery fix - deplete battery then recharge while OFF
I've had my Epic for about a month. I ran the stock OS on it and then installed leaked DK28. Like many of you, I never got more than 8 hours of use before needing to recharge (with Android 2.1 and now 2.2).
The other night, I fully depleted the battery, then plugged in the Epic while it was powered down. The stock empty battery graphic showed up, and i left it there to charge for about an hour. When I came back to it, the phone was still powered off and showed about 20% charge. I turned the phone on...and after it booted up it showed 80% charge! So...I shut it down and got back to the 20% stock charge screen. At this point it looked like the normal (powered on) charger was only going to charge it up to about 50% then stop. As such, I left it powered off and charging overnight. The next day (yesterday), I got about 10 hours use out of it.
Last night, I plugged it in as normal and left it charging while on. Today I still have about 40% left after 15 hours use!
So, it seems as if the normal battery charge sensor (at least in DK28) may be faulty. Do a power down and full recharge WITHOUT turning it back on to see if that helps!