The same holds true for battery power. [Andreas] wanted to use protected 18650 cells, but didn’t want to buy them off the shelf. He found a forty cent solution. Not only can you see it in the ...

I started to design a simple 4in1 PCB for charging 18650 cells while looking at my actual charging rig attached to some wood! Some time ago, i teached myself to design PCBs for hobby use. I really ...

Arduino Pro Mini TTN LoRaWAN Node with DHT22 and RFM95 module powered by an 18650 protected battery. The Arduino was converted to LowPower by desoldering the power LED and the voltage converter.