Yes, a good battery mower can handle half an acre. Ryobi states its 40V HP self-propelled kit is “ideal for 3/4 acre or less”, with up to 80 minutes from its two 6Ah batteries. Toro rates its 163 cc gas walk-behinds for yards up to 1/2 acre. So half an acre sits inside both claims. Gas makes more sense when your mowing sessions run long, or the grass is often tall and wet.
What Do the Makers Claim for Yard Size and Runtime?
- Ryobi RY40HPLM01K2: Ryobi lists “Up to 80 minutes of runtime using (2) 40V 6Ah batteries” and says the kit is “Ideal for 3/4 Acre or Less”. The kit includes both batteries and a charger.
- EGO LM2156SP: EGO claims “Up to 75 minutes of runtime on a single charge with the recommended 56V 10.0Ah” battery. Its 2026 catalog adds that runtime may vary with the battery, its charge level, grass condition and technique. EGO doesn’t publish a yard-size rating for this model. As of November 2026, its product page lists the kit as “Coming Soon”.
- Toro 21462 and 21565 (gas): both list yards “Up to 1/2 acre”, with a 163 cc Briggs & Stratton engine and Personal Pace self-propel. See the pages for the 22-inch 21462 and the 21-inch 21565. Toro says neither mower meets California’s CARB rules, so neither ships there.
Treat runtime as “up to”: the makers’ own footnotes say it depends on grass height, moisture and how you mow.
How Can You Tell If One Charge Is Enough?
The quickest real-world check is to time the current mowing. Then compare it with the runtime claim, and leave a margin for thick spring growth. If you mow half an acre in about an hour, an “up to 80 minutes” kit covers it with some to spare. If you regularly need more, a second battery solves it. EGO sells the same mower as LM2156SP-2 with two batteries.
The Math for Half an Acre
Runtime only means something next to how long the job takes. Half an acre is 21,780 square feet. A mower covers its cutting width multiplied by walking speed, so the time follows from there.
This example assumes a walking pace of 3 mph (264 feet a minute) and a 10% allowance for overlapping passes. Both are assumptions rather than maker figures, so swap in a real pace if it’s known:
| Deck | Coverage per minute | Half an acre, no obstacles |
|---|---|---|
| 21-inch | about 462 sq ft | about 52 minutes |
| 22-inch | about 484 sq ft | about 50 minutes |
So a clear half acre fits inside both stated runtimes of 75 and 80 minutes, with about 25 minutes to spare. Treat that margin as the real figure to watch. Stated runtimes are “up to” numbers, and the makers say grass height and moisture reduce them. Trees, beds and turning at the ends also add time that this math leaves out.
If a yard already takes more than about an hour with a gas mower of similar width, plan on a second battery or on gas. The same formula works for any lot. Divide the mowed area in square feet by the deck width in feet and by the walking speed in feet a minute. Then add the overlap allowance. Take the house, driveway and beds out of the area first, because they aren’t mowed.
Battery vs Gas, Point by Point
| Battery (EGO, Ryobi) | Gas (Toro) | |
|---|---|---|
| Starting | Push button | Pull cord |
| Run limit | Battery capacity; swap packs to extend | Refuel and keep going |
| Upkeep | Charge and store batteries per the manual | Oil, fuel and spark plug per the manual |
| Stated yard size | Ryobi: up to 3/4 acre | Toro: up to 1/2 acre |
| Deck | 21″ | 21–22″ |
The batteries are the costly part of a battery mower, and they wear out. Check whether they work with other tools from the same brand. Both EGO (56V) and Ryobi (40V) sell other tools on the same battery systems. Confirm the fit on the maker’s site.
What Should You Check on the Spec Sheet?
- Battery included? Ryobi’s kit includes two 6Ah batteries and a charger. EGO’s LM2156SP kit includes one 10Ah battery. The LM2150SP is the bare tool. A “tool only” listing needs batteries bought separately.
- Runtime basis. Note which battery a runtime claim assumes. Ryobi’s 80 minutes uses both packs, and EGO’s 75 minutes uses the 10Ah pack.
- Deck width. The Toro 21462 cuts 22 inches against 21 for the others. That’s a small difference in passes over half an acre.
- Availability. EGO’s page lists the kit as “Coming Soon”, and Toro’s mowers don’t ship to California. Confirm stock before planning around a model.
Which Suits a Half-Acre Yard?
- Battery suits a yard you mow in under an hour, and owners who value quiet starts and low upkeep or already own batteries from the brand. Ryobi’s two-battery kit has the largest published yard rating for this lot size.
- Gas suits long sessions, grass that is often tall or wet, and owners who’d rather refuel than manage charging. Toro’s yard rating of “up to 1/2 acre” puts this lot at the top of their stated range.
- For more than an acre, or slopes, a rider may fit better. Check its manual’s slope limit using the slope guide.
Sources
All of these pages were read on November 7, 2026.
- Ryobi, 40V HP Brushless 21″ Self-Propelled Mower Kit (RY40HPLM01K2) product page
- EGO, POWER+ 21″ Select Cut XP Self-Propelled Mower (LM2156SP) product page and 2026 product catalog
- Toro, 22 in. Recycler w/Personal Pace (21462) product page
- Toro, 21 in. Super Recycler w/Personal Pace (21565) product page
