I found the Caliper Battery Saver but I found it to be too small and didn't fit snugly and the little handle was too small which became difficult to print, so I decided to make my own remix of it.
This works in the same way as the source thing, by separating the battery from the connector which stops the current leak causing it to deplete after a few weeks of not using it.
CaliperBatterySeparator.stl | 19.6KB |