Originally Posted by
MightyPup Would there be a different voltage output on differing micro USB cables?
Cables, no. Chargers... sort of.
The USB standard is 5 volts, one half amp. Most smartphones need more amperage to change efficiently, so they'll charge very slowly, if at all, when connected to a standard USB port.
I think the Maxx can charge at up to 1.2 amps. Some older Motorola chargers were 750 mA, or three quarters of an amp.
To stay ahead of the power draw, I think you need at least a full amp of charging power. Most USB wall warts are listed at 2.1 amps; the extra juice won't charge your Maxx any faster than a 1.2 amp charger, but it won't cook your phone, either.