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5x 21700 power bank — image 1
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5x 21700 power bank

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Power bank that can hold 5 21700 cells and supports most charging protocols, including PD.

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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. 

In my configuration powerbank comes with 20.000 mAh and weighs 450 grams. 

A lot of capacity in a very reasonable form factor. 

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