21700 battery power bank case

thingiverse

I got some unused 21700 cells and made a power bank case for them the electronics are from aliexpress search for 5v power bank module link to ones I ordered https://www.aliexpress.com/item/4001194744356.html Rechargeable Lithium Ion batteries are potentially hazardous and can present a serious FIRE HAZARD if damaged or shorted i am not responsible for personal injuries if you decide to build this project I recommend soldering the negative connection to the battery last use flux and sand and clean the connection do not leave heat on the battery for long please be careful if you make this project lol do not short battery like I did nothing to bad happened battery was at 3.3v and was not fully charged the wire got a little toasty but pulled it off carefully resoldered it and it works made 3 of them last 2 went together fine I used old laptop screws to put it together make sure there not to long or they will hit the electronics mine made there own threads going in but where quite tight I also used a little super glued on the edges of circuit board to hold it in the cap and hot glue on positive of battery to keep it together and prevent it from shorting out