I'm all in (for the most part) on the electric lawn equipment. I love the
EGo brand that is sold at Lowes and online. The upside/downside is the batteries. Unless you want a ton of batteries and chargers, you need to stick to 1 brand.
I have a 1/3 of an acre in NY. So I mow seasonally, do leaves in the fall and have some decent sized trees to keep trimmed.
Overall, one huge benefit to all the equipment is simple starting. No pull cords or anything that would require throwing out a shoulder or hitting yourself in the face on the recoil. lol Its funny b/c after the lawn mower, my main reason to buying the electric gear is b/c my wife wanted to help with the lawn and I was sick of having to start all the equipment for her.
I started with the mower, got it on a floor model clearance at HD (when they still sold Ego). Its super quite (someone walking by once stopped to ask if the mower was even on) , easy to adjust the height, and with the largest battery I can usually get my whole lawn done in 1 shot unless the grass is super high. However the best benefit is storage. With no fluids to worry about, I can fold it up to the size of a suitcase and take up very little shed space which is huge in the winter when I'm storing all my lawn furniture in there.
My 2nd unit was the string trimmer. Holy heck, it is as powerful--if not more--than a gas one. Super light even with the smaller sized battery. My only problem is that I got it before they came out with the interchangeable pole. But I'll get to that.
My 3rd was the backpack blower. I'll be honest, its not as good as gas powered. Its great for all the things listed above--easy start, lightweight, quiet, etc--but it just isnt as powerful as my gas powered. Esp in late fall when I'm doing heavy leaf blowing. I still keep my gas powered for this reason. But its great for easy summer work like blowing off the patio or the driveway when its mostly grass clippings or small sticks, etc.
Next, we recently bought the edger. I'll be honest, its still in the box, I have not used it. But it has the interchangeable pole, which is huge b/c my next purchase will be the pole chain saw and I won't need to buy the main head part again, just the attachment.
As for batteries, they are mostly interchangeable. I have 1 large one and 2 smaller ones. The large one will get me a full cut on the lawn, or a few hours out of the blower. Both units take a smaller battery as well, so if I cant get a full cut out of the big one, I can pop in a smaller one to finish up while the big one is recharging. Besides the trimmer (which for me takes very little battery time) I very rarely use all of the equipment in the same day, so like I won't be using the pole saw the same day as I mow, so I really don't need to buy a whole new battery just for the saw.