I't seems to me my TP battery is draining faster than it used to. How long are charges supposed to last? Mine is draining about %20 each day while not being used at all while in airplane mode. I put it in airplane mode and fully charged it and it took only 5 days to die. This with me not using it during this time at all. Is this right? I use a touchstone charger. It takes 6 hrs to fully charge my TP. Should it take this long?