I'm having an issue with my 3GS on 5.1.1 with the untethered jailbreak. In Settings -> General -> Usage, the usage and standby times are equal. I don't know if this is affecting battery life at all (After 1 hour and 40 minutes, I was down 10% with only wi-fi usage). I tried a restore and it fixed the problem for one day. Any ideas on what is going on? I have tried charge cycles, hard resets, and resetting all settings with no luck.