You can't really reduce the power consumption..
.. you need to increase the charging rate.
The problem is the USB charger.
That is only 400 ma.. That is barely a trickle charger and not enough to use the GPS while charging.
.. it is not designed to both use and charge the phone at the same time.
Go to "Best Buy" and get their "Rocketfish" charger..
.. about $26 but it is rated at 2500 ma.
More info here about 1/3 the way down:
Originally Posted by drdubb
Do you have any hints on reducing power consumption in the Droid.
I have a USB charger hooked up, but I find that if the cord works loose or if I let the charge drop, it is very difficult to get the droid back up to full charge.