PowerBank under 3$

I was thinking what I gonna do with all my Li-Ion 18650 batteries.

A PowerBank under 3$ could be a nice project to deal with. It can also be usefull for my gigantic 7 segments Arduino clock project

So I decided to make a portable power bank using 5 Samsung P22 18650's Li-Ion batteries wired in parallel giving me a nice 11Ah power supply.

What else you will need?

• TP4056 Micro USB 5V 1A Lithium Battery Charging Protection Board
• USB boost up
• M3 Inserts
• M3*16mm Allen screws

To speed up charging of the PowerBank I added a 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 (: