Well, been messing aroung with the new GT around the yard. So...The other day I forgot and left it on for almost 2 days. Last night I go to mess around with it and of course the battery was dead. Hooked up the wall charger and the red light came on and the green light on the battery pack. About 1.5 hours later both lights were OUT. Is this normal or has the charger had it after 2 uses.