2AA Rechargeable Battery Holder Add-on Box

thingiverse

This is a box-and-lid to hold a 2-AA battery holder that can then be connected to any device that normally uses a button cell (like CR2032) but where you are now tired of buying button cells and would like to convert the device to use rechargeables instead. In my case, I did this for my bathroom scale. In a previous project I did this for a kitchen scale as well. You will need some soldering equipment and skills and the confidence to dismantle and reassemble a low-voltage electrical device.