1. This item 48V 20Ah was built by new original Samsung inr18650-22P 5C 10A high drain cells . 2. BMS manufactured by high quality Mos and IC imported from Japan . Keep your battery long cycle serivce life time . 3. Provide 48V 3A high quality brand intelligient charger with EU ,US, AU , GB plugs 100-240V 50/60HZ charger ,which can be used well in your country .