Enclosure for DIY Raspberry Pi UPS

thingiverse

OK, so the first thing you need will be three lithium ion batteries rated for 3.7v. These batteries typically charge up to 4.2v maximum. Next, you'll need a Battery Management System or BMS. The one I chose is designed for three batteries specifically. You can get other models that will handle more batteries if you want to increase your capacity.Additionally, you'll need a Buck Converter/Adapter to lower your overall voltage to 5v before feeding it to your USB port. I needed to take a small Phillips head screwdriver and sand down the tip to flatten it out. The potentiometer is like an eyeglass screw.I recommend connecting different colored wires to each of your 4 battery terminals with a soldering iron. You don't want to mix these wires up. Of course, you'll need to verify all these voltages with a multimeter.Also, don't forget to buy some barrel power connectors to provide your 12 volts. But be careful! You need to ensure that the total mAh of your batteries is equal to or greater than the amperage of your inbound connection. I use three batteries with 650mAh each, for a total of 1920mAh, so I utilize a 12v 1.5a AC Adapter to ensure my batteries never fully charge and expand. My goal isn't to run my equipment from my batteries, but to just ensure uninterrupted power. All the terminals on the circuit boards where you solder wires are labeled. If you really need help, go to the Electrical Engineering Discord Server.