The Makita DC18RD Twin Port Charger is able to charge two Makita slide style Li-ion and Ni-MH batteries (with adapter) at the same time, this is as fast as the DC18RC charges one battery. The DC18RD h more→as full charge sound alert, an LED charging display, and electronic current limiter which provides overload protection. The Twin Port charge times are 2 x 18 Volt 3.0ah Batteries 22 mins, 2 x 18 Volt 4.0ah Batteries 36 mins, and 2 x 18 Volt 5.0ah Batteries 45 mins.