4*10 18650 Battery Holder ( Integrated, Not Stitching) Used For 4p10s 36v 10ah Li-ion Battery Pack Electric Bike Battery Bracket - Tool Parts - AliExpress
13S 5P Silver fish Plastic 18650 Cell holder – LLT POWER ELECTRONIC
Source 4s 5s 6s 10s 18650 battery hexagonal holder cylindrical lithium battery circular spacer for DIY battery packs on m.alibaba.com