18650 Powerbank Case Box DIY by edwardchew

Last crawled date: 3 years, 1 month ago

updated files on Jan2019updated 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 modulehttps://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 usedhttps://www.banggood.com/DIY-Creality-CR-10-3D-Printer-300300400mm-Printing-Size-1_75mm-0_4mm-Nozzle-p-1085645.html?p=DG23031123036201501P