Description: A secondary battery for extending your SF20/SF20H/SK20/SK200/Kangaroo/FT2 range. Premium lithium battery cells Note: Does not come with a charger. The original charger is suitable for all 4 capacity batteries. Riders must be over 175 cm tall to custom-make a 20Ah battery. Riders shorter than 175 cm are not advised to order a 20Ah battery, as this would require raising the seat post—that is, raising the seat to its highest position. In addition, to ensure compatibility, the 20Ah battery must be used with a dedicated mounting rail and lower support; please note that these two accessories are not compatible with other battery capacities. The customization cycle for the 20Ah battery is about 2 months , and the shipping time is approximately 15 business days . If you prefer to avoid waiting, we kindly suggest refraining from placing an order. Please consider carefully before purchasing. The battery key should be in the " ON " position whether you are placing the battery on the e-bike frame for a ride, measuring the voltage, or checking the remaining battery power. All accessories are non-refundable and non-exchangeable. Battery Maintenance Guide: https://vtuviaebike.com/blogs/news/battery-maintenance-guide-how-to-protect-your-battery