10x18650 DIY power bank
10x18650 DIY power bank using old laptop battery cells
I got from here: https://www.ebay.com/itm/QC3-0-LCD-Display-10x18650-Battery-Case-Power-Bank-Shell-DIY-Quick-Charge-Box/353003652868?hash=item5230a84704:g:FEgAAOSwvLtebEYS
Seller's note about the power bank box:
Made of premium material, it is wear resistant and durable.
LCD digital display, easy for you to monitor the real-time battery bank capacity.
Can be installed 10x18650 lithium battery.
Fast charging, plug and play, long charging time.
Mini portable design, convenience to carry. Light weight design is very easy to carry.
Compatible with 99% USB devices, such as smart phones, tablets, computers and so on.
Function:
Temperature protection
Short circuit protection
Reset protection
Anti-reverse connection protection
Over current protection
Over voltage protection
Battery overshoot protection.
DIY design, easy and convenient to use. Perfect for outdoor travel use.
Rated 30000mAh
Cautions:
Can only use the 18650 battery of which positive electrode is flat top.
Do not close the cover until the test it is finished, it can not be open again if closed (if do it'll break the internal plastic hooks and cover won't fit perfectly).
Specifications:
QC3.0 USB Output: 5V/3.1A; 9V/2.0A; 12V/1.5A
Type C Port Support PD fast charge, and support input and output.
Support Quick Charge Protocol:
QC2.0/QC3.0/PD2.0/PD3.0/FCP/AFC/SFCP/MTK PE+ 1.1&2.0/USB C DRP/BC1.2
Material: Plastic
Size: 220x79x23mm/6.7x3.1x0.9in
Weight without batteries: 135g
Weight with batteries: 600g
Updates:
I was able to charge Samsung Galaxy S9 (3000mAh, 15% to 100%), 4 (four) times.
It gets hot on the circuit when charging the power bank or fast charging the phone.