Last night unplugged the phone from fully charge (100%) at about 11pm. But at about 11am next morning I checked and the battery was at 67%. all night it was on standby didn't event touch it after unplugging it. 1/ Is this normal, or anybody had this issue? 2/ Could this be because of my jailbreak? only have 3 thing installed from cydia. 3/ Any way to improve this battery life? thnaks.