I was so excited when I saw this crazy "USB rechargeable" battery that I HAD to have it!
I have been using rechargeable batteries for some time, because of my higher usage at work for flashlight and testing equipment that use AA, and thought this was a HUGE development!
I received the batteries and charged all of them fully. The first one that I used was as expected and powered my flashlight, but then I tried the others in other devices.
They do not seem to work in all devices and sometimes just DO NOT make good contact, or are just a little quirky.
I still like the idea, but they do not hold charge very long and do not work in some devices. May be fine for TV remotes or low usage items that they DO WORK IN.
Not a fan anymore, but will use them in places that they work, because it is pretty cool to recharge you AA battery by just plugging it into your USB port!