While the voltage (v) is ok, I would expect the current (mA) is too low to charge or even maintain the charge while the INC is powered on. (i.e. while powered on, the INC uses power. If the power supplied isn't greater than the power consumed, it wont have enough to charge the battery.)Anyway, the only thing I have at home that has a microUSB adapter is my Jabra blue-tooth charger.
Output= 5.0V, 180ma
Can I use it to charge my Droid Incredible?
I've used a couple of different chargers and the only thing that I noticed with one of them was that I couldn't access the phone while it was being charged. Non of the buttons were accessible! Still charged though!