Suitable for DIY combination of import batteriesWith 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 combinationType 18650 belong to necessary support of high-end battery combination, can withstand high drop, high strength support, easy to heat dissipation, convenient combination, fixed specifications, and free combinationWith card slot at edge, any size can joining together, match up firm, with strong, and no need for other device connected by vibration testFeatures: and high quality.Material: plasticSize: 100 x 80mmPore size:18.4 mmCombination:4x5 CellColor:BlackPackage Contents:50 x Lithium batteries Plastic holdersOnly 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.