Battery packs contain 50 eighteensixfity batteries that are two amps and 4.2 volts each. This rechargeable battery pack is an ideal power source for your eBikes, eScooters, or any other electronic devices that require a high or low drain. With a voltage of 36V and a chemical composition of Li-Ion, this unit type battery pack is capable of supplying a maximum of 50 units of power. The battery packs are manufactured in China and are suited for various applications, including high and low drain devices, as well as solar/wind devices. The battery pack is an essential and reliable source of power for your electronic devices. More than likely Will need to be disassembled prior purchase.