Description

21700 cells from disassembled Tesla battery packs. Each cell has a new heat-shrink wrap and an insulating ring on the positive terminal, ready for assembly. 100% of cells are tested and sorted. This group has a capacity of 4.4–4.6 Ah and an internal resistance of 14–15 mOhm. Use cells from the same group in one battery pack so the cells work evenly and charge equally. The lower the internal resistance, the better a cell handles current and the less it heats up. When you build a pack from matched cells, the difference between neighboring resistance groups is small. What matters is that all cells in the pack come from the same group. For convenience, we can laser-weld bimetallic aluminum–nickel contact tabs onto the cells. You can easily solder wire to these tabs or spot-weld nickel strip onto them. The service costs 20 UAH per cell.