In my experiments, it seems to be multitasking apps left running that is running my battery down. If I leave (for example), email running, or OTR Streamer to just "time out" and do not shut off multitasking manually when I exit, then I get much shorter battery charge life. Just letting the iPad time out to a dark screen no longer insures iPad being off. Now I must press the little black power button to be sure iPad is powered off. Then the excess battery drain does not happen.