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I think many of those power tool batteries are 18650 or 21700 batteries soldered together under the shell. Laptops used to be, but as they've gotten slimmer and
by jerlam 2y ago
I think many of those power tool batteries are 18650 or 21700 batteries soldered together under the shell. Laptops used to be, but as they've gotten slimmer and more space-conscious, now have mostly moved to custom pouch designs.
- dreamcompiler 2y ago> batteries soldered together under the shell. They are not soldered. They are spot welded to bus bars. The distinction matters because the long duration of heat from a soldering iron will destroy Li-ion cells. A spot welder delivers more heat over a shorter time. This doesn't damage the cells.