Electric chain saws.
I must admit, in April the girlfriend and I jumped on board, and we bought an expensive battery powered lawnmower, and weedeater. They have gotten heavy use and I could not be more impressed. These are wonderful tools. Quiet.

I am interested in a battery powered chain saw. However, I have a 33 year old Stihl 039 that I have used extensively and the damn saw won't die, just cut a 22 inch black walnut up with it this afternoon and it ran like a top.
Also have a pro model Husqvarna that is 6 years old, I paid $618 for it, and, of course, it runs great. Very little maintenance with these saws.
Also have a little bitty Stihl 009 that I use for particular cuts on log cabins.

So I have $1500 in gas powered chain saws I don't think I can justify going electric on the chain saw.