i just got a elite 3600 7 cell battery and i have this charger http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXL348&P=ML my question is how long should i charge the battery before its full? only 15 munites? or should i run the charger longer? please lmk asap so i can get back to crawling. thanks