A secondary battery for extending your SF20/SF20H/SK20/Kangaroo range. Each battery is built with premium battery cells for long service life. There are two types of batteries we have: 48V 13AH Battery, and 48V 15AH Battery. Features: Does not come with a charger. This is ONLY suitable for our VTUVIA SF20, SF20H, SK20, and Kangaroo, other models are NOT applicable. NON-REFUNDABLE Battery Maintenance Guide: https://vtuviaebike.com/blogs/news/battery-maintenance-guide-how-to-protect-your-battery [https://vtuviaebike.com/blogs/news/battery-maintenance-guide-how-to-protect-your-battery]