A simple holder for 3 AA batteries or rechargeable battery packs. It allows batteries to be inserted easily while staying securely in place.

Push the cable through the holes at both ends, then insert it into the battery. It works well with LED light strips.

It’s designed to fit tightly, but if you prefer more space, I suggest scaling it to 101%.

In my case, it can be used as a battery upgrade for some motion sensor lights, greatly extending their runtime, and I don’t mind it being a bit bulky.

My use case only requires battery storage, and I used the built-in PCB of the light strip, but if you’re starting from scratch, you can buy a cheap 5V USB-C charging PCB, like this one.https://share.temu.com/fMlvixM39ABAnd connect it like this: