Amazon : CITYORK 4 Pack 3.2v 32700 LiFePO4 Lithium Li Ion
CITYORK 4 Pack 3.2v 32700 LiFePO4 Lithium Li Ion Rechargeable Batteries with DIY Nickel Sheets for Scooter, 35A Continuous Discharge Maximum 55A Battery, Widely Applications: Electric vehicle, Electric Bicycle, Tricycle, scooter, golf trolley, cart, wheelchairs, Medical instrument, Solar supply system,solar panel, energy storage,