Amazon.com: BestTong 18650 Battery Case Holder, 2 Slots 3.7V DIY Battery Storage Box in Parallel or Series Plastic Batteries Case with Clips Pins Contacts for Soldering 2 x 18650 Pack of 2 : Electronics
4*10 18650 Battery Holder ( Integrated, Not Stitching) Used For 4p10s 36v 10ah Li-ion Battery Pack Electric Bike Battery Bracket - Tool Parts - AliExpress