I don't know if any electric chainsaws really have the power of a serious gasoline chainsaw. However, I can say that electric chainsaws are what I use around my small homestead. I don't have a ton of use for the chainsaw so most of the time it would sit idle. I would worry about the gas going bad. With my electric ones they has thus far been ready to go and start right up no matter how long they've been sitting unused. At the moment I think my personal favorite is the Oregon cordless chainsaw. https://amzn.to/2XUfKLM I have one with a 4.0 ah battery. I bought an extra battery too so I could swap them out if I find I'm using it for extended periods of time. I admit I haven't put this to the test yet. It may happen this fall when I start felling more of my dead ashtrees for next years firewood. Part of what I like about the Oregon saw is the special PowerSharp sharpening system they have which can sharpen up a dull chain in seconds. (Note it does require a special chain due to this.)
The cordless does have less power to it than a corded electric chainsaw in my experience thus far. When I got the Oregon Cordless I also got a new Oregon corded chainsaw at the same time. https://amzn.to/2y3Ml2A This was to replace my Makita corded chainsaw. https://amzn.to/2Y1lHGX The Makita was working great but then kept locking up like the chain gears were out of alignment causing it all to bind up and stop. I paid $100 for the local authorized Makita repair shop to fix it... and it still binds up. Very annoying. However, when it was running it ran great and I cut up a lot of firewood with it. My hope is that the Oregon corded chainsaw will work with the same power as the Makita, but have the advantage of the PowerSharp chain sharpening system and hopefully not have the binding/lock up issue. Again, we'll find out when I really get to cutting down the ash trees. My plan is to use the cordless to take them down and cut into manageable logs I can then haul closer to the house where my heavy duty 100 foot cord will reach, allowing me to switch to the corded chainsaw to cut the logs up into firewood size. Then I'll use my kindlingsplitter ( https://theartisthomestead.com/an-incredible-tool-for-splitting-kindling/ ) to split the logs up into smaller pieces for my Rocket Mass Heater ( https://theartisthomestead.com/rocket-mass-heaters-increase-your-wood-burning-efficiencies-50-to-90-percent/ ). Depending on the log diameter size I might have to do some initial splitting with a traditional splitting maul until the sections are smaller for the kindling splitter.