My 650 mAh eGo batt has been on the charger for about 4 hours. I hadn't had a chance to check it until now and was surprised that the charger is still red (indicating that it is still charging). However, every 10 seconds or so, the charger quickly flashes green. I took the batt off and hit the button and it lit up. Should I go ahead and take it off the charger? It's never taken more than a couple of hours to charge.