PowerBank under 3$

thingiverse

<i>Portable PowerBank Under $3</i> I've been thinking about what to do with all my spare Li-Ion 18650 batteries. A portable power bank under $3 could be a fantastic project to tackle, and it would also be incredibly useful for my massive 7-segment Arduino clock project. So I decided to create a portable power bank using five Samsung P22 18650's Li-Ion batteries wired in parallel, giving me a nice 11Ah power supply. What else do you need? * TP4056 Micro USB 5V 1A Lithium Battery Charging Protection Board * USB boost up * M3 Inserts * M3*16mm Allen screws To speed up the charging of my PowerBank, I added an XT60 plug so I can use my RC battery charger to charge it really fast! To build this PowerBank, I used the following tools: * Creality 3D CR-10S 3D printer with huge printing bed 500/500mm * PLA filament * Soldering station with hot air gun * Hot glue * Soldering third hand GOOD LUCK!