Power bank with two18650 batteries

thingiverse

My take on a power bank featuring two 18650 batteries. All materials used come from an old power bank or scrap found in my workshop drawer. I'd like to extend apologies to all strict electricians for disregarding wire color coding - decent red wire wasn't available. Black foam at the top of the battery positive contact serves as a spacer to increase pressure. The top piece is glued to the base part; if you prefer bolts, simply replace the top piece (the Fusion 360 source file is accessible). The base part has already been designed with provisions for it. Tips: a) If spare spring contacts are available, use them on the positive battery pole for better contact. b) Find good electronics - I've used components from a cheap Chinese power bank and they only provided 1A maximum.