Mahle Smartbike Systems eX1 External Range Extender Battery Description: The Mahle Smartbike Systems eX1 External Range Extender Battery seamlessly pairs with e-bikes equipped with Mahle XS, X20, and X30 drive systems. Just slide this lightweight range extender battery into the holder/bottle cage, plug the connecting cord to the main battery port, and boost your ride with 171Wh, or up to 43 extra miles (70km) of riding range, depending on your power usage, weight, and terrain. Plug this into your e-bike and get ready for some really fun adventures! Note: Connector cables are not included and are available separately. Features: 171Wh adds up an additional 43 miles (70km) of riding range IP67 waterproof rating means this extender will safely work in inclement weather Size and shape of battery fits within a standard bottle cage so if the extender is not needed for a ride, the bottle cage can be used for a waterbottle Battery only weighs 2.43 pounds (1.1kg) Charges up to 80% capacity in roughly one hour Can be charged via the charger for the main battery of a Mahle XS, X20, or X30 drive system, or via a Mahle SmartBike Systems Energy Hub (sold separately)