I'm not sure what is causing my problem. I installed JD Free in hopes it would solve the problem but have had mixed results. I have a Samsung S3 SGH-1747 running stock rom on Tmobile. I've had it for about six months purchased used. I noticed this problem from day one. I am a light user, seldom on the internet, half a dozen calls a day, the occasional text and no social media. I might play a game for 10 minutes twice a month. If I go online, it's to do a search or map direction. My standby battery power varies considerably from day to day. I might go a few days where by nightfall the standby power is at 80%. Other days the battery can be exhausted after in six hours. I have power saving enabled and Wi-Fi disabled. I can't see any unusual activity when reviewing the JD log. Example - 13:54 Screen off 13:54 Data disabled 13:54 Disconnected 14:18 Schedule start 14:18 Data enabled 14:18 Connected: mobile 14:18 AutoSync ping 14:19 Schedule stop 14:20 Data disabled 14:20 Disconnected 14:48 Schedule start 14:48 Data enabled 14:48 Connected: mobile 14:48 AutoSync ping 14:49 Schedule stop The schedule is consistent whether I'm getting 6 hours or 48 hours of battery power. Thanks for any positive advice.