Bosch PowerTube batteries are integrated into the bike frame protecting them from the elements and concealing them from view. They are available for with the plug positioned for vertical or horizontal installation within the downtube, which allows for a narrower or wider cross section when viewed from above. FEATURES : Vertical and horizontal mount batteries are not interchangeable. Purchase the battery matching the bike's battery plug orientation SPECS : Designed for ebike: Yes Bosch Drive Unit Compatibility: Active Line , Active Line Plus , Performance Line , Performance Line CX Bosch Generation Compatibility: BDU2XX , BDU3XX