> with the battery weigh the same as a gas version with gas and oil in the tank.

I still marvel that the liquid I call 'petrol', is called a gas in some parts of the world.

In one of the bigger models, say the Stihl 66x series, there's 825ml of petrol, and 825ml of oil (let's call that 1.5kg) that isn't there by the end of your half hour. Whether that's meaningful I guess comes down to fitness / strength.

As sibling commenter noted, electric chainsaws are hugely compelling for intermittent / infrequent use. Here in AU the pricing isn't compelling yet, though.