Amazon.co.jp: Battery Case for 20700/21700 Batteries, Set of 2, Waterproof, Heavy Duty, ABS Plastic, Battery Case, Convenient Storage, Battery Storage Case, Durable, Sturdy : Electronics
21700 Case Ebike Battery Shark Case Sea Moon Sm01 Battery Case For 52pcs 18650 Or 30pcs 21700 Battery Cells / 21700 Hailong Case - Electric Bicycle Accessories - AliExpress
Wholesale Battery Case M4 for 2 pieces 21700 store battery up to 76mm From m.alibaba.com
20700 & 21700 battery case - Battery 101
XTAR 21700 Battery Case
21700 Dual Battery Case | 3D CAD Model Library | GrabCAD