Shenzhen JKN Battery Co., Ltd. sold me two lithium batteries they came with no connections, just two leads and no charger, it cost about 800 dollars and an extra 280dollars to get them running and charged. They lasted one weekend and failed. They both don't work now. Don; t save money, buy local at least we have laws and warranties. They just said to try new battery management systems and get a tech to fit and they may work.