The Bosch powertube 500 sets new standards and presents a minmalist,timeless look coupled with sophisticated technology. Bosch powertube 500 Features 500Wh Including Hazardous goods box and operating instructions Rechargeable battery can be integrated into the bicycle frame At 2.8 kg only slightly larger than the PowerPack 500 Easy and safe to insert and remove Integrated battery management system ensures high mileage and long service life No memory effect and no self-discharge