Greenworks Pro 80V GLM801602 21-Inch Push Lawn Mower Review

The GLM801602 is a 21-inch, 80V battery-powered walk-behind mower with a brushless motor and a 3-in-1 cutting system: mulch, bag or side discharge. It runs on Greenworks Pro 80V batteries and is intended for yards up to 1 acre.

This mower is sold under several closely related model numbers, and the number on the box decides what comes with it, above all how many batteries and of what capacity. The GLM801602 as sold here includes two 80V 2.0Ah batteries and a 30-minute rapid charger. Check the included list before you assume a runtime, because two small packs hold roughly the same total energy as one larger pack, but you have to stop and swap them mid-job. That difference in packaging is also why runtime reports for this mower vary so widely.

The notes say what each figure changes when you are standing behind the mower.

Cutting power is the headline. The brushless motor and SmartCut load sensing read the load and raise blade speed in thick grass, and buyers on Amazon most often praise exactly this: the mower gets through thick and wet grass without bogging down and delivers the power of a traditional gas mower. Performance is the most-mentioned topic in their feedback, and it is overwhelmingly positive.

Starting and running it

Push-button start means no pull cord, and there is no oil, no gas and no fumes to deal with. Ease of use is the second most-praised quality among buyers on Amazon, and it is the reason many of them switched from gas in the first place.

Build and adjustment

The steel deck is a long-life choice next to the plastic decks found on lighter cordless mowers. A single lever raises or lowers all four wheels together, so changing height between passes takes a moment, and the 10-inch rear wheels help the mower roll over uneven ground.

Neighborhood manners and coverage

It runs quietly and gives off no exhaust, so the mower suits quiet neighborhoods and early starts. The 4-year warranty on the tool signals an expected life well beyond a season, and buyers rate value for money positively, with two batteries and a rapid charger in the box.

The mower has no drive wheels. At its size and weight, pushing is real work on slopes and in heat, and it is the most common source of disappointment among buyers who ordered it expecting self-propel.

Battery life is the weak spot

Battery life is the one topic where Amazon buyers are divided, and it draws a large share of comments. Some find the packs fine; others report runs as short as 15 to 20 minutes. The stated up to 60 minutes is a best case, and the two 2.0Ah packs mean swapping mid-job on a larger lawn.

Runtime drops when the work gets hard

Thick, wet or tall grass drains the packs faster, which is exactly when you need the power. Treat the 1-acre figure as a ceiling rather than a target for a push mower with two small packs.

Slopes and finish

Without drive wheels there is no slope confidence: a sloped yard turns every pass into a push, and the practical limit is set by your own stamina rather than by the mower. Mulching and bagging are not flawless either. Mulching tall or wet grass can leave clumps, some clippings escape when bagging, and the side-discharge chute fits loosely.

One battery platform

The 80V packs work only with Greenworks Pro 80V tools. They are not interchangeable with other voltage lines, so the batteries are an investment in this platform alone.

Two 80V 2.0Ah packs and a 30-minute rapid charger come in the box. The up-to-60-minute figure and the 15-to-20-minute complaints can both be true because runtime depends on grass height, moisture, the deck height you set and how often SmartCut ramps the blade up. Expect a practical range well under the rated runtime in heavy spring growth, and closer to it in light, dry, regular cuts.

Running one pack while the other charges

The two-pack setup lets you run one battery while the other charges, which stretches a session, but you still have to stop and swap. There is no automatic switchover between packs.

Mowing advice that protects runtime

Battery warranty

The 4-year warranty covers the tool, and the battery carries the same 4-year coverage.

This is a substantial mower, fine to push on flat ground and tiring on slopes. Buyers on Amazon rate its weight positively overall, but the push-only design is the catch that comes with it.

Storage and fit

The handle folds and the mower stands upright for tight garages, and the handle height adjusts for different users. Its footprint is 34 inches deep, 24 inches wide and 43.3 inches high.

Maintenance

The mower is quiet enough for residential use and gives off no exhaust fumes.

Buyers on Amazon praise performance, ease of use, weight, value for money and power, all in mostly positive terms. Performance draws by far the most comments, and battery life is the one subject where opinion splits, with a meaningful minority reporting short runs.

The ratings lean heavily to four and five stars, with a small tail of one-star reviews. That pattern fits a mower most people like and a minority who hit the runtime wall or the push-effort wall. The side-discharge chute also fits loosely, and mulching tall grass can leave some clumps.