Hey guys, my friend bought a S plus and he facing a battery life problem now. He said that sometimes when he turned off the phone, it still drains the battery. His S plus couldn't last for a day long. I've checked out XDA forum, and flashed 2.3.4 for him, the problem still existing. I put the phone idle for 2 hours after fully charged, the battery left 77% only with usage of 50% cell standy and 50% phone idle.  Anyone encounters the same problem here?

depending on your data provider,check ur apn..then make sure you tick to use packet.data...

how fast is fast? if the battery drain like 10% in 1 hour then should send back to warranty. if drop like 1-2% per hour then is totally normal

Standby

Could be something is messing with ur battery.. do u have any apps auto sync in background?
if ur not sure wat is using up ur battery u can do u factory reset and see whether is really battery prob or rogue apps

yup. that's it. but u'll lose all data. it'll clean up ur phone like brand new. 

All apps will be clean and your sms and phone book and etc. Sometime some application will drain your battery very fast. When in standby mode also.

So for confirmation before bring to samsung.

1. Hard reset your phone.
2. Remove your external sdcard.
3. Do not install any app. Do not confirm any gmail and any sync setup.
4. Full charge your handphone.
5. Unplug your charger and leave it overnight.
6. Check how is the battery status next morning by refer to Status-About Phone-Battery Use