Simple battery pack holder for 3 x AA batteries or rechargeable batteries. Allows for easy battery insert and a tight hold at the same time.

Route the cables trough the holes in the ends, then insert the batteries. works fine with led light strips.

In my case it works as a battery pack upgrade for some motion sensor lights, the autonomy got a great boost and i don't mind the bulge.

My use case only required the battery storage and took advantage of the built in  PCB of the light strip but if you're starting from scratch, grab a cheep 5v USBC charging PCB such as this https://share.temu.com/fMlvixM39AB and wire up like so :