Gridfinity with pin 18650 battery storage

This is an 18650 battery storage module compatible with the excellent gridfinity with pin  system that doesn't require magnets.

See https://makerworld.com/en/models/440624#profileId-346300 for the base and https://makerworld.com/en/models/440625?from=search#profileId-346318 for boxes

Replaced the bottom of the battery storage model with a base compatible with gridfinity with pin.