Charge 1-8 Ni-MH or Ni-Cd batteries from your car's cigarette lighter while you drive to the track! Perfect for charging transmitter batteries, receiver packs, airplane packs, glow plug igniters and more! Use #HB31509 adaptor to charge receiver batteries, #HB31512 adaptor to charge HPI Micro battery packs, or #HB31516 adaptor to charge glow plug igniters. It doesn't get any easier.