![]() This was simply hot glued to the back of the battery holder in parallel, a simple switch was added, and the entire thing was fitted in a neat little 3D printed case that looks like a car (motorcycle?) battery. A battery holder for these cells is cheap and easy to source, leaving the only other needed component a cheap 5V boost converter. The build started off, naturally, with a pair of Energizer D cells that hold 20,000mAh. They’re cheap albeit one-use and disposable, so why not build a USB power bank out of a massive pair of batteries? These will work just fine, but remember: you can buy D cells just about anywhere, and they actually hold a ridiculous amount of energy. ![]() If you want to make a synth setup portable, your best option is looking at USB powerbanks with their fancy lithium cells. Is one of those people who’s always playing around with synthesizers, and in this day and age, that means a lot of USB cables supplying power.
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