There is some good conversation to be had here regarding battery powered saws. I have a 30A tract and a good portion of that is wooded, so I use chain saws every day. All are gas powered and all are either Stihl or Husqvarna with bar lengths from 12" on MS192 to 48" on a Husky pro saw. I keep chains sharp and saws well tuned, so no problems with hard to start gas saws. For several years now, I have also used a Milwaukee Sawzall (old 18V with adapter to use newer battery) and Milwaukee hackzall (not sure that is spelled right). I use Milwaukee only because I already had a bunch of other Milwaukee stuff and hence had batteries and chargers. Those have worked well for me, especially in pruning and cutting around stumps or other areas where dirt would ruin a conventional chain. I have seriously looked at Milwaukee's line of battery saws, but am really considering the stihl battery equipment line. For the Stihl stuff, I would have to buy batteries and charger whereas with the Milwaukee gear, I have batteries. I am interested to follow the conversation of this thread to see if professional users like ultrarunner are finding battery saws work to their advantage. As to battery tools becoming obsolete as battery technology evolves, I have older Milwaukee 18V tools and Dewalt 18V tools that I have converted to use the Milwaukee red lithium batteries and they work just fine. There are some jobs I will always use gas powered saws, but I think there is also a definite place for the battery saws and I would like to hear more SERIOUS conversation regarding the experiences of those of you who use chain saws of all types in your professional work. By the way, I guess I would be considered an "old guy" who still has a working poulan bow saw which I bought new in 1967 on my 21st birthday.