Looking for a new external battery I actually wasn't out of place reading reviews on a site dedicated to Apple. Any good battery that can charge an iPad (which most can't) is going to do my windows tablet just fine. But I had to laugh at this short sightedness: So micro-USB is for Android? Man I wonder what nearly every other phone on the planet uses? As much as I would like to deny Windows Phone and Blackberries existences... Liking this one. I have a compact 6000mah battery with ac charger built in but it fails to deliver. My 7800mah battery from PNY cuts off charging off the 2.1 amp port, though it works over the 1 amp port. Both fail to charge 2 devices of lower power at once as advertised... tough market.