Bests & Worsts Reviews from Amazon

Okay, since other reviewers already went over the aesthetics and feel of the Powercore. I will go straight to the technical side of things. This Powercore+ 10050 has, you guessed it. 10050 mah. Or 10.05 AHr. But a lot of people doesn't get that 10050mah has a voltage rating. The nominal voltage of the batteries used. Most likely the 3350 mah LG INR18650F1L batteries. 3 of them to be exact. So the correct full capacity should be 10050 mah at a nominal voltage of 3.7v (most lithium ion batteries.) After some math, you get 37.185 Whr, more than what Anker states on the battery itself. So let's skip over to the circuitry. You would think that you should get 10050 mah out of the usb ports to a "usb charger doctor". However, that is not how it works. Based on a one run test of the battery. At 1.2 amps constant current. I was able to draw 6560 mah from the usb port, but take note, this is at ~5 volts (4.97v to be exact). So if you calculate current x voltage = wattage. So 6.56AH x 4.97v = 32.6 WHr. If you compare that value to what Anker stated on their power bank (36.18 WHr) you quickly find out that the efficiency of this charger is pretty incredible. 32.6/36.18 = 90.1% Keep in mind. I did the test with a pretty normal usage scenario, normal phone that draws a good 1.2 amps. (LG G3) Of course if you use the QuickCharge 2.0 technology, you will see a much worse efficiency as you will be converting 3.7v into 9 or even 12 volts. Since the principle behind the step up switch mode converter basically chopping up the DC to make AC then doing the normal AC-AC transformation, then lastly making it back to DC; the more you raise the voltage, the more heat is produced, thus lowering the efficiency of the converter. So now we got a fully discharged power bank. You can charge it one of two ways. The first is the traditional 5v 2a. Which in my opinion takes way too long for a power bank of this size. So that is why this power bank has the option go charge at 18 watts. 9v 2a. So I set my power supply at 9.2 volts because of wire resistance, and a current LIMIT of 3 amps, just in case things go haywire. I have measured the voltage drop, and at the end of the micro usb cable, I get exactly 9 volts when I put a 2 amp load. The powerbank was reluctant to draw the full 2 amps it was rated for, but I soon figured out the reason why that was the case. Only after 15 minutes of charging, the whole battery bank heated up to 140F (60C). Which is way out of the Charging specifications for the battery used. 45C Max. *Disclaimer... I basing my researches on what batteries I think Anker used, I cannot confirm what batteries Anker used without destroying my power bank taking it apart. So Anker, It would be nice to share some pictures with me to prove me wrong, or agree with me. Anyhow, back to the review, curiously enough, Anker programed the charge controller to ramp the input current so there is not a current spike at the power supply end. A very nice touch that no other manufacturers implemented into their products. So I tried a charging test. With 9v and 1.8 amps at the micro USB head. I was able to charge the power bank to the 50%+ led in one hour. So in theory, with only 15 minutes of quick charge, you can have enough charge to charge a iphone 5 once. Okay, to conclude this. I was NOT given a free item nor was I paid for this review. So you can expect a real review. Even if I was given a free product, you can expect real reviews from me. As an Electrical Engineer person, I look into the more important side of things. I will attach a screenshot of the datasheet for the battery I think that was used. And pictures of the test equipment I used and values used in this review. I hope you gained some important knowledge about the other side of products on the market.