18650 Powerbank Case Box DIY

*updated files on Jan2019
*updated on 02/11/17 with shorter nipple and new pic

Why do i do this? Because no powerbank in the market is good enough for my needs or at their best performance or quality. When I build my own, I know i put the best in it, benefit as below,

• true dual 2A output, (it's capable of 3A in actual load test, but phone limits draw at 2A)
• high quality 18650 cell, the same as in Tesla
• discharge cut off at 3V, fully utilise capacity of the battery at 80% rule, some in the market cut at high 3.7v, too early
• able to recharge the powerbank at 2A, vs only 0.5A for those in market

Here's the video reviewing my powerbank
Performance test : www.youtube.com/watch?v=WTpypuS-RZw
Build video : www.youtube.com/watch?v=FlWlueCm8sU

This is remixed due to the original quite narrow width to fit the 18650 batteries. Also the circuit board/module seems a bit different hence require trimming. So I drew one from the ground up based on the dimension from original creator.

It's tested to fit perfectly with the diy powerbank module purchased below.
Single module
https://www.banggood.com/Dual-USB-5V-1A-2_1A-Mobile-Power-Bank-18650-Battery-Charger-PCB-Module-Board-p-1031593.html?p=DG23031123036201501P

3x module (more recommended so you have backup module in case...)
https://www.banggood.com/3Pcs-Dual-USB-5V-1A-2_1A-Mobile-Power-Bank-18650-Battery-Charger-PCB-Module-Board-p-1133268.html?p=DG23031123036201501P

Panasonic NCR18650B - Good, Cheap, Quality been tested on this project and my drones.
4 of these are soldered in parallel, not series. So you get 4x3400mah, where in the market usually 4x2500mah only.
https://www.banggood.com/4pcs-NCR18650B-3400mAH-3_7-V-Unprotected-Rechargeable-Lithium-Battery-p-943453.html?p=DG23031123036201501P

Am very happy with the board above as it's verified to output 2A and input is 2A too! hence it gets "rejuiced" very quickly

For my own version, I just cover it with a 2.75mm thickness clear acrylic board to show off the inner parts. secured with either tiny screw or hotglue.

As for the LED, I de-solder and relocated it to point forward, just drill a 5mm hole, SLOWLY!

Do comment if it works well for you, I'll be happy to hear that

3D printer that i used
https://www.banggood.com/DIY-Creality-CR-10-3D-Printer-300300400mm-Printing-Size-1_75mm-0_4mm-Nozzle-p-1085645.html?p=DG23031123036201501P