Cordless electric chainsaws are very handy. I have several gasoline-powered chainsaws: An Echo, a Poulan, a John Deere, and a pole saw attachment for my Husqvarna strimmer, but my little Milwaukee M18 chainsaw is the one I use most often now. Since we downsized to one property two years ago, we're down to 2-1/2 acres, which is mostly wooded, but I don't need the big saws as much. I've cut down 12-inch-diameter trees with the Milwaukee, and it uses the same batteries as my other Milwaukee tools. It's also very handy for limbing trees once they're down, as well as trimming firewood.
Now that I think about it, the pole saw attachment 'might' (I'll have to check) also fit my wife's Milwaukee string trimmer (which I bought for her because she likes to trim around her garden and doesn't like to mess with gas engines very much).