Its not all perfect thoughhas one annoying quirkdefect there is a button that when you press it lights up leds letting you know how much battery is left as one led has 25 written next to the other 50another 75and finally 100 but for some reason i always have to press that button make the battery start charging a plugged in device if i just attach my phone or bluetooth they wont start to get charged until i pressed that buttonand i have to do this every time i plug and unplug any device to charge from this battery although you only have to press the button once every time you connect it and as

Also love the build quality and style beatiful smooth rounded aluminum caseanother nice feature is that the battery pack charges itself very fast most battery packs i have seen or used charged at 1 amp this one charges at 2 amps thats basically twice as fast

Works really well seems to actually hold the 9000mahcharged my phone and my bluetooth headset a few times so far