TestFreaks tried the Avantree Juno 6800mAh Portable Power Bank
A quote from the article:
Up for review today I have some power for you in the form of the Avantree Juno portable power bank which has a 6800mAh capacity battery inside of it and can charge not only phone but tablets as well since it can output 2.1 amps on the USB port. The Juno has a built-in USB cables with both microUSB and standard USB connections on it so you don't have to carry a cable with you to charge the Juno, your devices or even for syncing. The Juno is small and portable and it seems nicely made and it has four LEDs on it to indicate battery capacity and charging. Read on to learn more..Avantree Juno 6800mAh Portable Power Bank Review @ TestFreaks