At first I thought the battery drain was from the launchers I was using, so I uninstalled them and used the standard launcher. I closed wifi and data connection, gps and so forth. I let it stay on during the night, and it seems that my galaxy s2 drains about 1% per hour during standby. Is this normal? My HTC tattoo only drained about 2-4% of battery life on standby on a period of about 7 hours. Galaxy s2 drained about 8% in 8 hours. Would battery life improve if I rooted the phone?