Compared with gas-powered chainsaws, what are the advantages and disadvantages?
So we all know that electricity is a more eco-friendly resource and there are some states that have a law to limit gas-powered equipment, why there are so many gas-powered types of equipment exist now?
I've got a tiny top handle Makita 18v. It's good for trimming branches or for shortening a few pieces of firewood that are too long for the stove. Its quiet so it doesn't disturb the neighbours.
While it has its merits, it's not any kind of replacement for a gas saw for felling and bucking -- and I've never seen a battery chainsaw that is. They are convenient and a little safer than higher-powered saws; but they don't have much runtime and their power to weight ratio isn't good. They don't do so well below freezing and I'm sceptical about their reliability in the rain.
Now, that said, I think it's probably the majority of chainsaw owners who have a chainsaw just for light duty trimming and storm cleanup around a suburban yard. If that's what you want a chainsaw for, a good battery model will do the job and is easier on the ears, hands, and lungs. They also require less maintenance.
(I doubt it's actually any better for the environment as a whole -- but legislators in some jurisdictions seem to think otherwise.)