So my battery life was a little scary for the first few days of ownership. I was recharging twice a day. Here are the changes I made, bringing awake time down significantly from the original 35%, and finally getting a full day's charge out of the phone:
1. Got rid of Messages widget, replacing it with a Handcent shortcut (just because I like it better, not because I think it uses less battery). Turned off notifications for Messages app.
2. Set personal email account to check to check every 15 minutes, work email account to check every 30 minutes, and turned notifications off for the Gmail app (again, personal preference says I like the Mail app better).
3. Uninstalled all app-killer type apps (I had three) and stopped worrying about app killing entirely.
4. Set Twitter (HTC Peep) to check every hour. I have the full-screen widget running so I can manual refresh if I want.
5. I made no reductions whatsoever to the haptic feedback or any vibration at all. Everything vibrates and lights up still. I also never turn off wifi or mobile network.
6. Turned off auto backlight and set it to 25-30%, which is really bright almost all the time.
7. Ran the phone til it died the last 2 days. Charged it all night afterwards.
I am now getting a solid 12% awake time on the phone! My ultimate suspicion is that the brightness setting change and dumping the app killers did the trick, with the full discharges helping lots too.
I wanted to give you some clues as to what has worked for me. I hope these help you get better battery life out of your Eris too!
