The only reason I got this tool was to see how they implemented the connection of the two 20V sections of the battery to get 40V. It's probably just banging them in series, but there's a good chance that the battery itself has no power switching facility and just has cell voltage monitoring, and maybe even balancing if we're lucky. It probably sends a control signal to stop the tool being used when one of the cells in the pack reaches a set low-voltage level.
The one bit I didn't show was the pair of carbon brushes for the split ring commutator. To rebuild the angle grinder (which I did) required complete removal of the brush assemblies, the insertion of the magnetic stator assembly with the keyed end going in first, the placement of the plastic fan cowl, then the insertion of the rotor. Noting that if everything is not correctly aligned then the end cap doesn't fit on. Presumably to prevent misassembly at the factory level.
The last thing to go on is the pair of brush holders, with the carbons re-inserted against their springs and then slid down into position so they pop out against the commutator before their locking screws are installed.
If you take one apart, note the motor polarity, as the motor will happily go in either direction and the wrong one will attempt to unscrew the disk locking ring when in use.
It's all fairly cheap, simple and logical inside.
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