gotta keep it warm for brake in. the reciver pack is a 5 cell flat or hump pack to power you servos. if you have peak detection charger it will shut down when the batteries reach peak capacity. if its a timer type charger, the paper work should give you some idea about charge time, if you use a little wall charger,sorry to tell ya but you won't be driving till the next day. if you have no experence with nitro PAY CLOSE ATTENTION TO THE BREAK IN PROCEDURE, DON'T RUSH IT<YOU CAN DESTORY THE ENGINE, GET IT OVER 200 AS FAST AS YOU CAN