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![Who here has made a DIY power bank yet? I'm trying to make a power bank (image for illustrative purpose only) that will use 18650 batteries (3s3p or 3s4p)I just wanna know Who here has made a DIY power bank yet? I'm trying to make a power bank (image for illustrative purpose only) that will use 18650 batteries (3s3p or 3s4p)I just wanna know](https://preview.redd.it/0ef8u423l1n51.jpg?auto=webp&s=703c5bf2de8384fff6cef60156d3d340518d1bf5)