You can use this case with your own battery to form power system supply
Made of high quality material, lightweight, convenient to carry
Easy to install
Type: battery holder for 4x 18650
Weight: 26g
Size: 4x 18650 Case Holder Approx. 78x79x24mm
Type: Battery Storage Box
color:Black
Material:Plastic + Metal
Package Contents:
30 x Battery Case Holder (Battery Is Not Included!)