Got a new Traxxas EZ Peak plus 6 amp charger and a couple of 5000 NiMh batteries. I set the charge mode to 5 amps and put it in Auto mode and hit start. Took about 50 mins to finish and the battery seems pretty warm. Almost HOT. Is this normal? Should I try going to 2.5 next time? Maybe the Auto mode isn't the way to go?