We have about 1/5 acre, and I mow it with a plug-in electric. I decided on that because of the cost (1/3 less!) and the unknown durability of the batteries (how many charges, and how long before a recharge). Our next door neighbor bought a rechargeable type just this season, and it seems to mow less than 1/4 of the yard before the battery dies. They've been trying to mow it all week, and it's still not done. It's their own house, so they made the decision, but there's no way I'd be OK with a landlord providing a lawnmower that couldn't do the entire lawn on one charge.
We were landlords with a single family house for 3 years. I find it odd to provide the equipment for a task the tenant is required to do. I put cleaning chemicals, sponges, plungers, brooms, vacuums, rakes, gardening tools, and a lawnmower all in this category, along with most lights. In some ways I'd be more willing to pay for a lawnmowing service or do it myself than provide a deadly piece of equipment for the tenant to use themselves.