Its a switch for your AA battery pack! Ever found yourself needing to switch on a project? If you are using a AA size battery holder this is the perfect addition. A plastic switch that fits between the terminal of your battery and the holder. Push it one way and the battery touches (ON) and push it the other and it doesn't (OFF). Highly useful. Enjoy.
Inspired by the thought of having to buy and mount a bought switch on an already finished project! Much easier to retrofit a battery box.....
Edit: V 2.2 has been added. Looks very similar to the original but it may work in places the original does not.
new file for 18650 batteries