Yep, it works. Hooked it up to an old motorcycle battery and saw the voltage slowly rise. Also tested the three different currents it's capable of charging at (183mA / 366mA / 550mA ). All worked fine. I'm really digging the enclosure on this one which is a small waterproof Otterbox 1000 from Adafruit. I drilled out the mounts and cable holes with a 1/4" spade or paddle bit.