3.7V AA li-ion battery holder w USB chargermodule

thingiverse

I built this to power my small electronic projects. The battery charger module also safeguards the lipo. Things I utilized: 1x 3.7v AA Lipo Battery (e.g. https://www.aliexpress.com/item/33051648340.html) 1x TP4056 Lipo Charger Module and Protection (e.g. https://www.aliexpress.com/item/32986135934.html) + 2x m3 bolts, 2x m3 nuts, some washers, some wires, and a couple of m2 x 8mm screws (or glue to attach the charger module) If you need help understanding the charger module, just let me know. You can also ask Google for assistance. The last version attached is designed for use without the charger module - e.g. for normal AA or when the protection board/charger module is not required.