New preferably, will consider used. 2017 bike, the battery is BMZ Brose down tube semi integral without wake 17,5Ah 27345-00: https://ebike.bmz-group.shop/en/pro...-integral-without-wake-18ah-27345-00#27345-00 Have been "on hold" through bike shop/Bulls for over 3 months, apparently out of stock and slow to replace, at least in US