Greenworks 60V 21 in Self-Propelled
The most battery per dollar in this group: a self propelled steel deck mower that handles up to about 3/4 acre on one charge.
Amazon $449.98$449.98
The Greenworks 60V 21 in Self-Propelled is the better lawn mower overall, rated 4.0 to 3.4. The Greenworks 60V 21 in Self-Propelled leads on power and cutting modes. The PowerSmart B8721S1 Self-Propelled wins on value. The PowerSmart B8721S1 Self-Propelled costs $69.99 less ($379.99 vs $449.98).
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 October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Greenworks 60V 21 in Self-Propelled for power (480 Wh of battery included vs 140 cc engine) and cutting modes (3 ways to cut: bag, mulch, side discharge vs 2 ways to cut: bag, mulch).
- Choose the PowerSmart B8721S1 Self-Propelled for value ($18.09 per inch of deck ($379.99, 21 in deck) vs $21.43 per inch of deck ($449.98 with batteries and charger, 21 in deck)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-propelled lawn mower; a clear win is highlighted. How we rank explains each one.
| Factor weight | Greenworks 60V 21 in Self-Propelled | PowerSmart B8721S1 Self-Propelled |
|---|---|---|
| Overall rating | 4.0/5 | 3.4/5 |
| Value 30% | 78 $21.43 per inch of deck ($449.98 with batteries and charger, 21 in deck) | 99 $18.09 per inch of deck ($379.99, 21 in deck) |
| Deck 20% | 12 21 in deck | 12 21 in deck |
| Power 15% | 94 480 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 60V 21 in Self-Propelled | PowerSmart B8721S1 Self-Propelled | |
|---|---|---|
| Cutting | ||
| Deck width | 21 in | 21 in |
| Deck | Steel | Steel |
| Cutting height | 1.3 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 | 60 V, 8 Ah of battery | 140 cc (Briggs & Stratton E550) |
| Battery energy | 480 Wh | - |
| Battery included | Yes | - |
| Runtime | 60 min | - |
| Brushless motor | Yes | - |
| Electric start | - | No |
| Build | ||
| Drive | Rear-wheel drive | Rear-wheel drive |
| Folds upright | Yes | - |
| Weight | 65 lb | 70 lb |
| Warranty | 4 years | - |
| Battery warranty | 4 years | - |