Greenworks LM1604 16-inch 40V push mower kit review

A compact kit that you push yourself

The Greenworks LM1604 is the maker’s model name for the 16-inch 40V mower sold as SKU 25322. The exact U.S. product page and its linked manual carry that same 25322 identity, so this assessment is for the 16-inch push kit with one 4.0Ah battery and charger—not a neighboring Greenworks 14-inch mower or the brushless 16-inch LM1624. The package page lists a grass bag; the matching manual also lists a safety key and mulch plug. The battery is included, but an extra pack is not.

Make the operating routine part of the decision

“Push” is the important qualifier. There is no powered drive to pull the mower up a grade or carry it along a long straight run. The operator supplies all forward movement, so choose this arrangement only if pushing a mower fits your strength and terrain. Its 16-inch figure is the cutting path, not the full assembled width needed to pass a gate or turn beside a fence. Measure the narrowest access point with the handle and wheels in their actual travel position before treating the smaller deck as a guaranteed fit.

The manual supports two clipping routines. For mulching, the plug closes the rear opening; for collection, remove that plug and install the catcher. The product page calls the mower a 2-in-1 mulch-and-bag model, and the manual explains the conversion. Side discharge is not documented for this exact configuration, so a yard that depends on a side chute needs a different, verified model. If the carton must contain the mulch plug, check the delivered contents: the page’s itemized package list names the catcher but omits the plug, while the exact manual packing list includes it.

One 4Ah pack and an uncertain lawn-size claim

Greenworks claims up to 40 minutes of runtime for the included 4.0Ah pack and two hours to recharge it. Those are manufacturer figures, not a field measurement or a promise that every lawn can be finished before the battery is empty. Bagging, dense growth, turning, slope and mowing height can change the workload. The listed five cutting positions span 1¼ to 3⅜ inches. The manual advises against removing more than one-third of the grass height in one pass and recommends adjusting the pace or width in heavy growth; taking a little more time may be preferable to forcing a fixed area-per-charge assumption.

Here that caution matters because the same exact product page gives incompatible coverage claims: its specification block says one-quarter acre, while the longer package copy says up to one-third acre. I leave maximum area unconfirmed rather than selecting the larger number. If a minimum acreage is essential, this configuration should not pass that hard requirement on the available evidence. The page also says an 8Ah 40V battery will not let the cover close. Do not infer fit for other 40V packs from voltage alone; the reviewed kit is the exact one-pack 4Ah setup.

Weight, deck wording and care

The page and manual both state 37.8 pounds, but neither clarifies whether that figure includes the battery. It is useful to know the published number, not enough to promise a ready-to-mow kit weight or bare-tool lifting weight. Similarly, the specification table calls the deck “Hardened Plastic.” I do not translate that phrase into a more specific material category without a definition from Greenworks. The handle folds for storage, but confirm the folded footprint and cable routing in your own shed rather than relying on an advertised percentage reduction.

The 25322 manual is specific about routine boundaries: mow dry grass, do not use the mower on slopes over 15 degrees, and travel across a manageable slope rather than straight up or down. Stop the blade and remove both key and battery before service or cleaning. Use the manual’s dry-cloth and deck-scraper guidance; it says not to hose-wash the mower. These limits are more useful than guessing from the mower’s compact size or battery label.

There is an open-box version, but verify its terms

Greenworks also lists Open Box SKU 25322-OB as model 25322 / LM1604 with the same 16-inch mower and 4Ah kit. The page describes a new, unused product moved to alternate packaging after damage to the original box, then inspected and tested. Its warranty language conflicts: package details say 90 days for tool and battery and all sales final, while the specification table says three years for each. Ask the seller to confirm the governing coverage in writing before comparing this version with the standard kit. The standard page’s three-year limited warranty should not be carried over to the open-box listing by assumption.

Who should shortlist it?

Consider the LM1604 when you want a narrow-cut, operator-pushed 40V mower, prefer a simple one-battery kit, and value a documented choice between mulching and rear collection. Its 16-inch pass may make sense for a divided lawn or tight mowing pattern, but the exact source does not settle acreage, operating weight or side-discharge capability. A person who needs self-propulsion, a confidently documented quarter-acre-or-larger rating, or a particular 40V pack fit should keep looking. For alternatives, compare the 14-inch LM1404 if a smaller cutting path is the priority and the brushless 16-inch LM1624 if you want to see a distinct 40V kit and its own manual caveats. Those models have separate SKU and evidence records; their specifications should not be transferred to the LM1604.

Manufacturer sources: Greenworks LM1604 / SKU 25322 product page, the exact 25322 operator manual, Open Box SKU 25322-OB listing, and the Greenworks recall register checked for exact-code context.