RYOBI has come out with a new USB Lithium 4V Battery system. The battery is charged via a USB type C port. So you can Solar Charge it! They only have come out with a Cutter, Screw driver, Chisel, and Rotary Tool. I designed and 3D printed an adapter so you can use the battery for other applications. As an example, I converted a Harbor Freight Pop-up LED Lantern to run off the RYOBI battery.
Here are the things I used for this project:
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The author marked this model as their own original creation.