Well, the bottom of my optical mouse says "Wireless Intellimouse Explorer", but i've seen different mice with the same name at Sim Lim, so i'm guessing Microsoft was very not fastidious about giving a different name to each iteration of their wireless opticals. i use 1800-2000 mAH NIMH on my opticals; typically goes flat about 2-3 months. i've only put one half-dead AA Energizer in my Logitech laser, lasted about a month+. That the laser mouse runs on one AA also makes it significantly lighter than the optical.
The laser also tracks on different surfaces where optical can't-make-it, like my workdesk surface, and responds from a *much* longer distance - about 10m with line of sight to the receiver.