✔️X-GO is a professional manufacturer which is focus on rechargeable lithium batterys.We have engineers team to provide professional technical services. ✔️X-GO Electric E-bike Li-ion Battery adopt imported electric core and equipped with a BMS protective plate,for battery over charge , over discharge ,short cirrcuit protection. ✔️Battery cells 100% balance before pack for voltage,resistance & capacity. 100% inspection on appearance and function before shipping. ✔️We'll launch new batteries one after another. Save our store and you'll find the batteries you want!