Fielect 3Pcs 7x8 Cell Spacer 21700 Lithium Battery Plastic Holder Bracket for DIY Battery Pack 21.7mm Hole Dia

Crack resistant edge with the slot, with the firm, It can accomodate various size. It can withstand high drop, high strength support, easy to heat dissipation, convenient combination, fixed specifications, and free combination. With professional battery holder to replace the traditional general adhesive, which would brings convenient combination and more firm connection, as well as brings convenient maintenance of the battery.its the best choice of the battery combination.