Mower, leaf blower, trimmer/edger, and snowblower all in the 40v. All of the batteries still work great. We are on .19 acres and I can mow, trim/edge, and blow the scraps on two batteries.
The only maintenance I have had to do is replacing the guard flap that attaches to the mower under the bag, and replacing the ground scraper on the snowblower. Both items were very inexpensive too.
Other than that, I have sharpened my mower blade once since buying it and have only had to worry about keeping batteries charged. Everything still starts up at the first push of the button each season.
No oil changes, mixing, spark plugs, carb cleanings, etc.