It adopts fireproof plastic, explosion-proof thickening, high drop resistance, high-strength support, dissipation, convenient combination, fixed specification and free combination It is made of fireproof materials and is non . It automatically extinguish in case of open fire, reaching V0 fire rating and effectively reducing the occurrence of fire accidents The edge of the battery base is provided with a card slot, which allows the battery to be assembled freely. Any size can be spliced together. The matching is firm and firm. It does not need to be connected by other equipment and passes the vibration test Using professional battery holder instead of traditional general adhesive is the for battery combination, which has the advantages of convenient combination, connection and more convenient battery maintenance Style:1 core Colour:black Material:plastic Package Contents: 30 * 18650 battery Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.