but for the project case. He stuffed his IR detector inside an old 9V battery case. The TSA probably won’t like it, but it’s a fantastic idea for those smaller projects.

The exception is the 9v battery which actually has six ... may find a new life inside of one of his upcoming projects. The six volt lantern battery on the left has four cells inside of it.

Explore how to make a USB rechargeable 9V Li-Ion battery! This simple yet effective DIY project allows you to power your devices with a rechargeable solution, saving money and reducing waste.