3D Printed 12000mAh Power Bank

One can never have enough power banks!

I had a few LG HG2 18650 3000mAh cells that I wasn't using, so why not 3D print a case and make a beast of a power bank?! :D

Please Note:
This is NOT my design. All credit goes to Kim3DIY for his amazing work!
Here is his Instructable:
https://www.instructables.com/id/Powerbank-DIY-120...

Here are the tools you'll need:

• 3D Printer - I used my Anet A8
• Soldering iron
• Solder wire (flux core preferable)
• Electrical wire
• Glue Gun
• Wire cutters
• Screw Driver

• Power bank module - https://goo.gl/L0R7sK
• 4 X 18650 Li-ion batteries - I used original LG HG2 3000mAh batteries
• 4 X 18650 Battery holder - https://goo.gl/Z8Y3ob

I used the following Thingiverse item:

https://www.thingiverse.com/thing:2261807

Printed on the Anet A8 with the following settings:

• Layer Height: 0.2mm
• Filament: CCTree PLA 1.75mm
• Infill: 10% - you should go higher - 20-30%
• Print Temperature: 190/60
• Print Speed: 60mm/s
• Travel Speed: 120mm/s

I used red for positive and black for negative.

Make sure you got the polarity correct.

• The red wire should go to the BAT+ on the board
• The black wire should go to the BAT- on the board

Before you hot glue the battery holder and module into the case, insert the batteries to test if everything is working correctly.

Make sure you get the polarity correct!

You don't want to connect this cells in the wrong polarity - it will damage(burn) the module!

The cells are connected in parallel - all the positives will connect to the +'ve rail and all the negatives will connect to the -'ve rail.

Since they are in parallel and each cell has a rated capacity of 3000mAh, this will result in a total capacity of 12 000mAh!

I had to sand down the reset button part a little and drill the hole in which it goes.

Other than that, everything should fit snug :)

I then used hot glue to secure the components and LCD

I used 4 x M3 screws to secure the lid on the case

I then used my label maker and printed some labels :P

There you have it!

All you have to do now is wait patiently as it charges up.

Charging:

It takes a while since the charging board only allows ~300mA of current to charge the cells. Unfortunately, this means that it'll take ~40 hours of charging from 0-100%.

Usage:

The power bank has two ports, 1A and 2.1A. When you connect something the LCD will indicate which port you are using.
The module has a button which performs the following:

• Long Press = Turn on/off the power bank
• Quick Double Press = Turn on/off LED torch