its not a dumb question......

but with a charger - my main bettery charger i use to charge my battery packs with has a plug for a reciever battery to get charged built in, or you can just buy a reciever battery charger

and most speed controllers can power your reciever so you dont need one, but some people prefere to have their reciever running off its own battery, i no jamie- (drumroll) used to