Greenworks 80V 21 in Push Mower
#3 in PushFull review
A sturdy steel deck push mower with a long warranty, for flat lawns up to about half an acre and owners of Greenworks 80V tools.
Amazon $399$399
The Greenworks 80V 21 in Push Mower rates 3.8 among push lawn mowers; the PowerSmart B8721S1 Self-Propelled rates 3.4 among self-propelled ones. The PowerSmart B8721S1 Self-Propelled costs $19.01 less ($379.99 vs $399).
PowerSmart B8721S1 Self-Propelled
#14 in Self-propelledFull review
A low cost rear wheel drive mower with a name brand engine, for sloped lawns up to a third of an acre that you bag or mulch.
Amazon $389.99 PowerSmart $379.99$379.99
Prices were last checked November 1, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different drive classes (push and self-propelled), and each is scored against the reference points for its own class, so a rating says how well each does among its own drive peers. How we rank explains each factor.
| Factor weight | Greenworks 80V 21 in Push Mower | PowerSmart B8721S1 Self-Propelled |
|---|---|---|
| Overall rating | 3.8/5 | 3.4/5 |
| Value 30% | 30 $19 per inch of deck ($399 with batteries and charger, 21 in deck) | 99 $18.09 per inch of deck ($379.99, 21 in deck) |
| Deck 20% | 100 21 in deck | 12 21 in deck |
| Power 15% | 49 320 Wh of battery included | 25 140 cc engine |
| Cutting modes 15% | 100 3 ways to cut: bag, mulch, side discharge | 50 2 ways to cut: bag, mulch |
| Warranty 20% | 75 4-year warranty | 50 warranty not published (neutral score used) |
Specifications
| Greenworks 80V 21 in Push Mower | PowerSmart B8721S1 Self-Propelled | |
|---|---|---|
| Cutting | ||
| Deck width | 21 in | 21 in |
| Deck | Steel | Steel |
| Cutting height | 1.4 to 4 in, 7 positions | 1.5 to 3.9 in, 6 positions |
| Bag | Yes | Yes |
| Bag capacity | - | 1.7 bushels |
| Mulch | Yes | Yes |
| Side discharge | Yes | No |
| Power | ||
| Power | Battery | Gas |
| Engine or battery | 80 V, 4 Ah of battery | 140 cc (Briggs & Stratton E550) |
| Battery energy | 320 Wh | - |
| Battery included | Yes | - |
| Runtime | 38 min | - |
| Brushless motor | Yes | - |
| Electric start | - | No |
| Build | ||
| Drive | Push | Rear-wheel drive |
| Folds upright | Yes | - |
| Weight | 62.8 lb | 70 lb |
| Warranty | 4 years | - |
| Battery warranty | 4 years | - |
| Released | 2024-01-16 | - |