HART 40V Self-Propelled Lawn Mower Review

Hart 40V self-propelled lawn mower review

Get Performance and Runtime with the HART 21-inch Self-Propelled Lawn Mower

Hart Tools may have started with very entry-level products, but the 21-inch HART 40V self-propelled lawn mower shows promise. Fortunately, the mowing season in Florida extends beyond much of the rest of the country. That gave us a chance to put this tool to the test to see what it could accomplish.


  • Folding handle, vertical storage
  • Bag, mulch, or side discharge
  • Single-point deck height adjustment
  • Power boost mode gives you a brief jump in power for cutting thick grass
  • Above-average cut quality


  • The presence bar creates a somewhat awkward grip
  • Can easily bump the drive speed slider while mowing

HART 40V Self-Propelled Lawn Mower Design Notes

  • Lightweight, corrosion-resistant 21-inch composite deck
  • Fast-Fold handles lets you easily store the mower upright and save space in your garage or shed
  • Quickly adjust the deck height between 1 inch and 4 inches with a single-point adjustment
  • Front LEDs let you mow longer into the evening
  • A sliding thumb switch lets you easily adjust the drive speed to match your preferred walking pace
mowing with the hart lawnmower

Using the HART 40V Self-Propelled Lawn Mower

Cutting Power

The brushless motor on the Hart 21-inch lawnmower spins the blade while maintaining power. We felt it cut through both Bahai grass and thicker patches of St. Augustine without too much difficulty. The 40V mower definitely cut with more confidence than some of the HART lawn mowers we’ve previously reviewed.

With a mower like this, having a temporary power boost feature came in handy. The HART 40V self-propelled lawn mower does a good job of adjusting power automatically. However, the power boost feature lets you press the mower start button to proactively increase blade speed and torque when approaching a tough area of grass. The increased speed mode activates for around 6 seconds before it drops back into its normal operating mode.

Hart 40V self-propelled lawn mower

While the top-performing battery-powered mowers we’ve tested outshine this tool, they also cost hundreds of dollars more. For homeowners looking to ditch gas, the Hart Tools 40V self-propelled lawn mower compares to a 140cc product.

Cut Quality

The HART 40V self-propelled lawn mower lets you mulch, bag, or side discharge grass. It also includes everything you need to work on either of these modes. We also liked that it used a true side discharge as opposed to a rear attachment. Each method has advantages, but for consumers, a true side-discharge makes a lot of sense. We also noted that this mode let us distribute grass clippings several feet outside our mowing path.

If you prefer mulching, you install the plug by lifting the rear hatch and seating the plug. This closes off the bagger chute and gives you better lift inside the deck. We thought the Hart 40V lawnmower did a much better job at mulching than past models. It performed similarly to other mowers positioned as mid to high-level solutions.

Hart 21-inch lawnmower mowing

Cut Evenness

Examining our cut path, we were definitely pleased with the evenness of the cut. Save for a few stray blades, we saw big improvements to how uniformly it cut the blades.


While the 21-inch HART 40V self-propelled lawn mower has two active battery bays—they don’t actively switch over. That means that you have to flip the red key underneath the lid to go to the other battery when one runs out. Obviously, this also requires a restart. Those with smaller lawns under 1/4 acre can likely run this mower on a single 40V battery.

manual 40V dual-battery system

Given optimal conditions, HART estimates you can cut up to a 3/4-acre lot with a pair of 6Ah 40V batteries. We tested runtime with a medium maintenance cut (2-inches) on a dry day with temps hovering right around 90° F (runtime tends to drop slightly at higher temps). With the two 6.0Ah batteries included in the kit, we cut for almost 51 minutes. Hart’s estimation may seem a little ambitious, but they likely tested with a 1-inch cut. We estimate you can plan to cut a 1/2-acre without having to change out the packs to finish.

HART 21-inch Self-Propelled Lawn Mower Price

Grab this HART mower at Walmart for $498. It comes with two 6.0Ah batteries and a rapid charger that’ll charge each battery in one hour. It has a 5-year limited tool warranty as well as a 3-year limited battery warranty.

The Bottom Line

After using the 21-inch HART 40V self-propelled lawn mower we’re impressed with the improvements in performance, cutting performance, and design compared to last year’s models. The design team over at HART set their sights high and stepped up to compete well against other mowers in the $500 range.

To check out the full HART 40V lineup, click here .

HART 21-inch 40V Self-Propelled Lawn Mower Specifications

  • Model: HART HLPM061US
  • Power Source: HART 40V battery
  • Cutting Swath: 21-inch
  • Accessories: mulch plug, side discharge chute, collection bag
  • Motor: Brushless
  • Self-propelled
  • Cutting Height: 1-4 in.
  • Deck Height Adjustment: 7-positon single-point
  • Warranty: 5-year tool, 3-year battery
  • Price: $498 (kit)

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