Nitecore Sysmax I4 Intellicharge i4 version 2, Four Bays universal home/in-car battery charger, Four Olight 3400mAh Protected 18650 Rechargeable Li-ion Batteries with 2 x EdisonBright AA to D type battery spacer/converters Capable of charging 4 batteries simultaneously Features three charging modes (CC, CV and Trickle Charge) Reverse polarity protection. Automatically identifies Li-ion, Ni-MH and Ni-Cd rechargeable batteries Compatible with: Li-ion: 26650, 22650, 18650, 17670, 18490, 17500, 17335, 16340(RCR123), 14500, 10440 Ni-MH / Ni-CD: AA, AAA, A, SC Olight 3400mAh 18650 Battery triple over-heat protection Bundle includes Four Olight 3400mAh Protected 18650 Rechargeable Li-ion Batteries with 2 x EdisonBright AA to D type battery spacer/converters