Supported battery sizes: 18650, 20700, 21700 (un-protected), 26650, 22650, 18490, 17670, 17500, 17355, 16340, 14500, 10440, AA, AAA, C., temperature ?. Lithium battery charging current: 4.20V @ 250mA / 500mA / 1000mA / 1500mA / 2000mA / 2500mA / 3000mA x 4.