The Bullet Train two-stroke motorized bicycle engine kit features a pull start and electric start. The electric start is solely reliant on this battery. Over time your battery will degrade and require being replaced. This battery is a direct replacement for the stock battery that comes with the engine kit. This battery will not work with any other engine kit other than the Bullet Train.
This 66/80cc Battery is designed for use with Electric Start 2-stroke bicycle engine kits, like the 66/80cc Flying Horse Bullet Train Bicycle Engine Kit
Note: This part is not compatible with standard 66/80cc 2-stroke engine kits, such as the Mega Motors engine, non-electric start Flying Horse engines, Grubee engines, RAW Motors engines, and Power King (PK80) engines