Greenworks 80V 21" 4-in-1 Self-Propelled Mower (LM2108S) vs Ryobi 40V HP Brushless 21" Self-Propelled Mower Kit (RY40HPLM01K2)
Two of the cordless lawn mowers in our best cordless lawn mowers: greenworks & ryobi push and self-propelled comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: 8 Ah 80V battery rated for 3/4 acre
Check price at AmazonRyobi 40V HP Brushless 21" Self-Propelled Mower Kit (RY40HPLM01K2)
Best for: 80 min runtime on two 6 Ah batteries
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | Greenworks 80V 21" 4-in-1 Self-Propelled Mower (LM2108S) | Ryobi 40V HP Brushless 21" Self-Propelled Mower Kit (RY40HPLM01K2) | Weight |
|---|---|---|---|
| Deck widthThe cutting-deck width in the maker's name or spec table. A wider deck cuts more grass per pass. | 21 in | 21 in | 25% |
| Kit battery energyBattery energy in watt-hours, computed as volts x amp-hours of the battery or batteries the maker says come in the kit (for example 40 V x 6 Ah x 2 = 480 Wh). Bigger batteries generally mean more work per charge from the same tool. | 640 Wh | 480 Wh | 20% |
| RuntimeThe maker's runtime claim with the batteries in the kit. Thick or wet grass and self-propel use shorten it. | 80 min | 80 min | 15% |
| Rated lawn sizeThe lawn size the maker says one charge (or the kit's batteries) handles, such as "up to 3/4 acre". | 0.75 acres | 0.75 acres | 15% |
| Cutting-height rangeComputed as the maker's highest cutting height minus its lowest. | 2.62 in | 3 in | 10% |
| Self-propelledYes when the mower drives its own wheels. That helps on slopes and with heavy decks. | Yes | Yes | 10% |
| Listed weightThe weight the maker lists. Makers don't always say whether it includes the battery, so treat small gaps as noise. | 89.1 lb | 74.8 lb | 5% |
| Kit battery | 80 V 8 Ah = 640 Wh (computed) | (2) 40 V 6 Ah = 480 Wh (computed) | info |
| Cutting height | 1.38–4 in | 1–4 in | info |
| Cutting-height range | 2.62 in (computed: max minus min) | 3 in (computed: max minus min) | info |
| Rated lawn size | Up to 3/4 acre (0.75 acres, computed) | Up to 3/4 acre (0.75 acres, computed) | info |
| Drive | Not listed | Rear-wheel, variable speed | info |
| Torque | Not listed | 9.54 lb-ft | info |
| Bag capacity | Not listed | 2 bushels | info |
| YardPick score | 6.5/10 | 6.4/10 | 100% |
Where each one comes out ahead
Greenworks 80V 21" 4-in-1 Self-Propelled Mower (LM2108S)
Better published figure on: Kit battery energy.
What we like
Watch out for
Ryobi 40V HP Brushless 21" Self-Propelled Mower Kit (RY40HPLM01K2)
Better published figure on: Cutting-height range, Listed weight.
What we like
Watch out for
Verdict
Both are 21 in self-propelled mowers rated for 3/4 acre with 80 min runtime. Greenworks lists 640 Wh and a 1.38–4 in range; Ryobi lists 480 Wh (2 x 6 Ah), 1–4 in and 74.8 vs 89.1 lb.
- Greenworks 80V 21" 4-in-1 Self-Propelled Mower (LM2108S): Greenworks: 80V 21" 4-in-1 Self-Propelled Mower
- Ryobi 40V HP Brushless 21" Self-Propelled Mower Kit (RY40HPLM01K2): Ryobi: 40V HP 21" Self-Propelled Mower Kit