This 12V 4Ah battery is the ideal replacement for ATVs 50cc to 125cc, Go Karts 80cc to 125cc, small Dirt Bikes, Mopeds, and Scooters, with dimensions of 2.75"x4.5"x3.5". It should be noted that Mopeds and Scooters can also use a slightly larger battery size, 12V 7Ah.