Upgrade your eBike's battery life with the extended distance Panasonic Lithium-ion 48v battery, the largest battery available on the market. With a lifespan of 900 charges, this game-changing battery guarantees improved rides for years to come. Factors like rider weight, temperature, and terrain can affect battery range, but our battery is designed to tackle all conditions. If you're purchasing a brand new Bakcou eBike, simply select "Extra battery with brand new eBike purchase" in the drop-down menu. If you're upgrading an existing Bakcou fat-tire eBike, select the appropriate battery discharge and charger from our images for reference.