Power Pack is an independent power assembly that integrates a DC motor, a lithium battery and a controller set. It is an ideal alternative power for gasoline engines. WEIBANG Power Pack is equipped with a 120V\4AH lithium polymer battery, suitable for household lawn mowers who's cutting widths less than 50cm. This power pack have advantages of zero pollution emissions, low noise, and maintenance-free. The plug-in battery pack is easy to install or remove, and which is equipped with a special charging seat for fast charging.