10AH 13AH 15AH 17.5AH. Li(NiCoMn)O2 18650. Function 1. (withthis function 1 ). Function 2. The lock is also the battery's power (on/off) switch. (withthis function 2 too by defaultly). (with lock's function 2, then during riding, the key will be kept on battery and can't be moved away till you stop riding.).
eBay