DC18RD is a two port fast charger capable of charging two Makita slide style Lithium Ion Batteries (or Ni-MH batteries in conjunction with an adapter) at the same time. Both batteries will be charged fully in the same amount of the time as the DC18RC fast charger takes to charge a single battery. The DC18RD is also equipped with a USB port for charging USB devices.SpecificationsCharge Times:2 x 18v 3.0ah Batteries: 22 mins2 x 18v 4.0ah Batteries: 36 mins2 x 18v 5.0ah Batteries: 45 minsBattery voltage range: 14.4v - 18vBattery type: Li-Ion (or Ni-MH in conjunction with an adapter)