36V/48V 21700 Seatpost Battery Case Conversion, Ebike Seat Tube Battery Box DIY

The battery case is not assembled by default.If you need to assemble it, you need to add 10 yuan/piece assembling fee.  (The battery case is not assembled by default; if you need assembly, an additional $2 per piece assembly fee will be required.)）  ​ ​ ​ ​ ​ ​ ​