Been running more power cycles with this one, and while charging Note 2 and Nexus 7 I see that actual capacity of this external battery is closer to 6000 mAh. While their Astro Slim2 which is rated at 4500 mAh is closer to 3100 mAh (full charge of our Note 2). It's still a great battery, no doubt about it, but you have to be realistic that battery capacity label is not what you will actually get. If you are lucky, you get 25%-30% loss, in other cases it could be 40% down. I talked to someone who got 10000 mAh no-name ext battery from ebay, and it turned out to be closer to 2500 mAh...
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