(Since the CE8301 converter he used poops out at around 180 mA output, Jan must be stating the sum of the two converters he used in parallel.) So, two “20 Ah” D cells are enough to charge one 3.4 Ah (ok, “3400 mAh”) phone battery. Which is about the maximum time the D cells will last. That will take about 14 hours to charge the phone pictured. Interpreting the Energizer datasheet, it looks like you’ll get that 570 mA at around 1.3V, so the batteries are delivering 1.5W, and the converter (at 85% efficiency) is delivering 1.26W = 0.25A. Now that we can see Jan’s the original article, we now know he said it draws 570 mA from the batteries while charging the phone. The original source wasn’t available at the time, so there was no way to do anything but take it on faith the Brian stated that correctly.īut you’re right. Posted in Toy Hacks Tagged D battery, powerbank, USB powerbank Post navigationīrian’s wording in the summary here says “Testing the with a phone revealed this thing will charge at 570mA…”, which I think it’s fair to assume means it charges a phone at 570mA (when running from a 3V supply). You can get D cell batteries everywhere, and what this build produces in damage to the environment is more than made up for in its convenience. Sure, using disposable batteries in 2018 is more than a little wasteful, but a project like this is meant to be a simple solution to the problem of providing power to USB devices anywhere. Testing the with a phone revealed this thing will charge at 570mA from 3V, which is more than sufficient for ’s needs. 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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