Swap your current battery or purchase an extra one so you can always keep a spare charging. You can lock the battery to the frame with the key, then press the button to power it on. When the bike is parked, the battery turns off automatically. Compatibility: Compatible only with Packa 5 models (frame numbers starting with US21–US25); front (down-tube) mounting position. Expected range: (12.8Ah) up to 40 miles per charge | (14Ah) up to 45 miles per charge Battery: Lithium-ion, Panasonic 18650 cells Lifespan: 25,000 miles (500–800 charge cycles) Weight: 7 lb Charger not included.