BiXPower 36V 11.6Ah (418Wh) Electric Bicycle E-Bike High Capacity Light Weight Lithium Ion Battery -BiXPower BX3691 High capacity: 36V 11.6Ah ( or 418 Watt-Hour) capacity. Made with high quality Panasonic lithium ion battery cells. Cautions: All batteries contain energy and should be used, stored, and disposed of in an appropriate manner.This battery is for professional users with advanced electric knowledge only. We are not responsible for any damages or losses caused by using the battery pack incorrectly. This battery is designed for independent use only. Please do not connect this battery directly with any other batteries, neither in serial nor in parallel. It can be used for 500W or less power motors. Light Weight: only around 5.5 pound. Small size: (7.1" x 4.8" X 3.6"). Easy to fit on many different place on bike. Very powerful: continuous output up to 450W ~540W. High quality: made with premium Panasonic Lithium Ion cells. High Durability: Water-resistant and firm ABS plastic casing. The internal pack is stabilized by braces. Built-in PCB protection to prevent short circuit, over-current, over-heat, over-charge, over-discharge. The internal pack is stabilized by braces that can avoiding mechanical accidents caused by vibration.