Bests & Worsts Reviews from Amazon

Bottom line: The product description on Amazon states 36800 mAh. When I tested it. my meter's measurement was less than 6000 mAh based on tested number times 1.35 for a 5V output. This method was based on the test device instruction; the actual number on the test device is even less; see the photos - tested twice. Note: the tester is not self-powered so it needs a power source to display the last readings hence USB cable in photos. The product description on Amazon also states 5V@3.1Amps. When tested, my tester measured about 5V@ about 2.1Amps. I say "about" because these numbers fluctuated slightly over the course of the battery discharging and the number never reached 5V when discharging at 2.1 or slightly more Amps; it was typically around 4.8V. NOTE: The spec sheet that came with the product states 5V@2.1Amp NOT 3.1 Amp like the product description on Amazon states. Their own spec sheet disagrees with what they are advertising. Lastly, notice the product weight. This item is basically a battery or batteries in a plastic shell with some electronics to control input and output, how can this product weigh so much less than others in the same mAh range? The only way I can think is if they had some super high tech batteries that were better than the competition but based on the measurements from the test device that does not appear to be the case. All that said, I bought this hoping it would be close to my old cell which weighs a half pound more and was advertised at 25000 mAh. I bring it backpacking and can have it fail or run out of power but I wanted one that was lighter and equivalent in output. I'm currently testing my old power bank so I can set a baseline for how much actual output I need. It is at 9000 mAh on the tester and only 2 of 4 lights (half) are out so if this rate of discharge holds, it will likely be close to its advertised mAh rating. Still doesn't help me with the weight and I now have to return the new one that is grossly misrepresented if my tester is correct.