I use a superbrain 959 and have 7 cell gp3300 packs and when i charge them they dont get very warm, maybe a slight rise in temperature but hardly anything. When i run my emaxx with two fully charged packs i get about 5mins run time, but thats 90% full throttle in first gear doing wheelies and donuts. Is this normal runtime for my batteries? or is my charger not charging them fully?