5x 21700 power bank
prusaprinters
<p>I had 5 21700 Samsung 40T left from another project so I decided to build a powerbank. I used this circuit, which supports most charging protocols. </p><p>In my configuration powerbank comes with 20.000 mAh and weighs 450 grams. <br><br>A lot of capacity in a very reasonable form factor. </p>
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