As far as this subject goes...
Initially I charged (Same battery, never changed it) off my printers usb port (I do this for almost all my inokin items with no problems) with a very short thin micro usb connector. The light didn't change but dimmed after charge. I then used a the micro usb cable for my mouse (its a logitech hybrid) connected to the usb 2.0 ports on my computer (off topic but my Cloupor just woke up by it's self again on it's own as I type this

) anyway...red light still dimmed but no green. Finally with almost an empty battery I used the same cable on a 3.0 usb panel I installed in my puter that actually gets it's power straight from one of the 5v rails on the power supply...not from the motherboard.
After about 4 hours it did indeed turn green. I have no way to check the voltage from the different sources but I'm assuming the charging board needs just a few more Ma than most of the sources provide.