Battery-powered motorized window treatments and roller shades are a way to use motorization where electrical wiring is difficult or impossible to install. Some good examples include a motorized shades on a set of doors or for clerestory windows near a vaulted ceiling.
The motors are 12VDC and can also be powered from a low-voltage power supply. This makes them good candidates for RV's and Yachts already running low-voltage. If you are interested in a low-voltage quiet motor then look at the Sonesse 30 here.
Refillable Battery Wands (8 x Lithium AA's) and also an optional Solar Recharging Kit (Ni-MH) provide options for wire-free power and operation.