i leave my ipod touch on the computer but it shows the plug icon even though its only 70% full. i installed SB settings and battery magic. battery magic says its 100% but sb settings says that its aroung 70-90%. i want to recalibrate but i can't as my ipod touch wont charge to 100%. i have noticed the low battery power. i play gta and my ipod reaches 20% in 30min. help?