PLEASE NOTE: DO NOT CHARGE WITH MORE THAN 2_Amp. PLEASE CHECK the charger before attempting to charge. Two we recommend, BIKEMASTER & BATTERY TENDER . 12V, 7_Ah. HIGH AMP RATING at 290 Cold Cranking Amps, F2 Flat Terminals, Light Weight (1.75 Pounds), Dimensions: 5.95” x 2.55” x 3.75” . Charger optional.