Ok.is the rx antenna broken at all?. is it broken inside the protective coating? fresh batteries in radio and rc?.so this is the 1/18 scale ruckus then.. any nimh battery charger will charge that battery . it being 900 mah tell me you need to charge at less than 1 c.. id say 1/2 amp.. you might need to condition battery to get a full complete charge into it.. thats the lowest charge your charger can do like .01 amp it will take maybe 16 hours or so.. that will bring all cell up to 1.48 volts with a 900mah bat. your run time might be in the half hour range.