In this DIY I am showing you how to build a (credit card size) power bank on a budget that can fit into your wallet like a credit card. The idea behind this build was to create a power bank from reusable materials (Coke cans, plastics, etc.) and electronic components you can find around the house. I used an old charging circuit from a power bank with a dead 18650 battery, as well as an extra 2200 mah battery from Samsung I had from an old phone. In order to keep from scratching the Coke can paint I also used a clear coat not seen in the video.
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