Bestol 3x5 Cell/4x5 Cell/2xCell/3xCell/18x6x50x1 Cell 18x6x50 Batteries Spacer Radiating Shell Plastic Heat Holder Bracket (100pcs Triple Bracket)

I liked them a lot. Fits well to most cells and assemble relatively easliy. Some reviewers here complaining that they are “a bit loose” in the cells must be using one single cell type that is probably a bit on the thinner end of the spectrum. Cells made by different manufacturers will occasionally be either a little snug or a little loose, and some will be perfect. The problem is certainly not the holders. Despite that I was able to assemble a 7s10p using several different brand cells with no problems. Definetly recommend!

Fit together easily, can make grid patterns of a variety of shapes. Only negative I've noticed is that large grids will come out somewhat curved/warped, but once batteries are added it can be pressed down and straightened out.

Well priced, but the batteries don’t fit snug. They have a lot of play. The batteries won’t stay together. They fall out. Batteries used are the Samsung 30q.

This is a great product if you are interested in diy lithium ion battery packs.