21700 Cylindrical battery holder, produced from ABBS raw materials. There are 2S, 3S, 3x4 and other structures. There is a card slot on the edge, which can be spliced in any size, and the fit is firm. It can pass the vibration test without connecting the upper and lower devices. It is suitable for DIY battery packs.

21700 is a high-end battery combination bracket, which can withstand high drops, high-strength support, easy to dissipate heat, easy to combine, fixed specifications, and free combination.

Note: LG, Samsung, Panasonic, Sony lithium batteries are suitable for aperture 21.2MM

Lishen, Foster lithium battery suitable for aperture 21.7MM