Here’s another item I found at the “3” price (75% off)
These were $80 originally and caught my eye when they went to $60.06. This is a Lithium Battery Booster for your car, it is supposed to be able to jump start a car with a weak battery. Let’s just assume it does for the time being. 
If it actually works $20 is a very good deal. Here is a quick review of it’s features.
There are 2 ways to charge it. Port on the left for house charging with the provided brick. The port on the left can be used to charge it from the cigarette lighter socket.
That port is also an output port to jump start the car in one of 2 ways, thru the cigarette lighter or with the provided short jumper cables.
On the other side of the unit there is flashlight and a 2.1A USB port. This unit can double as a power bank! I estimate about 10 lumens on the light.
But enough of this!
What I really want to know is WHAT’S INSIDE 
6 phillips head screws hold the back cover on and they come right off
As soon as I saw this, I could see that it was built like a drill pack. 6 - 18650 cells wired in series and there seems to be a BMS circuit here. The circuit board on the left seems to have 6 identical sets of components that probably monitor the voltage of each cell during charging and discharging.
I can’t see exactly what these 6 cells are as they are wrapped together as one unit and I do not want to take this apart any further. I don’t know if I could stuff all this stuff back together and have it fit in the case. I would think that the cells would certainly be IMR’s to handle the current in boosting and survive the rough use something like this would see.
Comparing the color of the cells, they could very well be Samsung 20Q’s. I am holding one up for comparison.
At this point, the easiest way for me to gauge the capacity of these cells is to charge one individual cell with my OPUS BT-C3100 and then discharge it, measuring the discharge capacity. If it is around 2000mAh I will call these Samsung 20Q’s
It will take several hours before I know and I will post the results.
At only $20 if anyone can find these, it could be that this is a great bargain. I was impressed and surprised with the seeming quality of this unit. Glad I bought 3. (those 3 cost less than the original price for one of $80)