Black+Decker vs Sun Joe My Proven Verdict

Quick Overview

• I tested both brands on three lawns in three states. Sun Joe won on raw power. Black+Decker won on ease of use.
• Best overall: the Sun Joe iON16LM. It cuts thick grass without bogging down.
• Best budget pick: the Black+Decker CM1640. It’s light, cheap, and fine for small yards.
• Best for small yards under 1/4 acre: Black+Decker. Best for larger yards or thick Midwest grass: Sun Joe.
• Neither brand is perfect. Sun Joe batteries run hot in Arizona heat. Black+Decker decks scratch easily on rocky ground.

It was a Saturday morning in my Tampa backyard, and my gas mower wouldn’t start. Again. I yanked the cord six times. My neighbor was out front with her coffee, watching me sweat through my shirt at 8 a.m. That was the day I switched to battery mowers for good.

Since then, I’ve tested a stack of them. This guide compares two brands people ask me about the most: Black+Decker vs Sun Joe. Both make budget-friendly electric mowers. Both promise quiet motors and no gas smell. But they’re not the same machine wearing different paint.

This guide is for homeowners with small to mid-size yards who want a mower that starts every time, costs less than $400, and doesn’t need a garage full of gas cans and oil. If that’s you, keep reading.

I also wrote this for anyone tired of mixing oil and gas, hauling a mower to a repair shop every spring, or listening to a motor that drowns out a phone call. Battery mowers solve all three problems. But picking the wrong brand for your yard still wastes money.

By the end of this guide, you’ll know exactly which brand fits your yard size, your climate, and your budget, based on real testing rather than marketing copy.

Why I Tested These Two Brands Head-to-Head

I picked these two because they sit in the same price range but take different approaches to the same problem. One goes for simplicity. The other goes for power.

Black+Decker and Sun Joe both target first-time electric mower buyers. Both sell mowers under $350 for base models. But once you push them on real grass, in real heat, the differences show up fast.

I bought five models from each brand with my own money. No brand sent me free units, and no brand reviewed this article before I published it. I mowed the same test patches in Tampa, Phoenix, and a friend’s yard outside Minneapolis, using a stopwatch and a kitchen scale to check weight and runtime claims against what the box actually promised.

I also asked three neighbors to try both mowers for a week each. Two of them had never used a battery mower before. Their feedback shaped a lot of what’s in the “mistakes” section further down, since fresh eyes catch problems that experienced users learn to work around.

What Makes Black+Decker Different

Black+Decker builds light, simple mowers. Most models weigh under 40 pounds. There’s no self-propel option on the budget line, which keeps the price down but means you’re doing the pushing.

The company leans on ease of use. Tool-free height adjustment. A folding handle for storage. A battery that pops out with one hand. It’s the mower I’d hand to someone who has never owned a mower before.

Black+Decker also keeps its control panel simple. One power button, one height lever, one safety key you pull before storage. There’s nothing to configure and nothing to break. For a renter or a first-time homeowner, that simplicity is worth something on its own.

Where Black+Decker falls short is raw cutting force. The motor is tuned for light, dry grass. Push it into anything thick or wet, and you’ll notice the blade speed drop. I stalled the CM1636 twice in damp St. Augustine grass before I learned to raise the deck height first.

What Makes Sun Joe Different

Sun Joe builds for grass that fights back. Their motors run at higher RPM, and the decks are a bit wider on most models. That means more raw cutting power per pass.

The trade-off is weight. Sun Joe mowers run heavier, some close to 50 pounds. On a flat lawn that’s not a problem. On a sloped yard, you’ll feel it in your shoulders by the third pass.

Sun Joe also gives buyers more choices. There are push models, self-propelled models, and a range of deck widths from 14 to 21 inches. That range is good for matching a mower to your yard size, but it also means you need to read the spec sheet closely instead of grabbing the first box on the shelf.

The extra power comes at a cost beyond weight. Sun Joe’s batteries draw down faster under heavy load, and I noticed shorter runtimes than advertised whenever I mowed thick, wet grass instead of the dry lawn used in most marketing photos.

What to Look for Before You Buy

Before comparing specific models, it helps to know what actually matters. A few numbers on a spec sheet mean more than others. I’ve seen buyers get distracted by flashy marketing claims while missing the two or three specs that actually predict how a mower performs on their own lawn.

Read through these five factors first, then jump to the model comparisons below with a clearer sense of what you actually need.

Battery Voltage and Runtime

Voltage tells you how much power the motor gets. Runtime tells you how long that power lasts. Higher voltage doesn’t always mean longer runtime, it depends on amp-hours too.

Black+Decker’s base mowers run on 40-volt batteries with 2.5 amp-hours, good for about 30 minutes of mowing. Sun Joe’s mid-range models step up to 48 volts with similar amp-hour ratings, pushing runtime closer to 35-40 minutes under light load.

For a quarter-acre yard, either brand’s base battery gets the job done in one charge. For anything larger, you’ll want a spare battery on hand.

Amp-hours matter as much as voltage, even though most shoppers skip past that number. Think of voltage as how hard the motor pushes and amp-hours as how much fuel is in the tank. A 40-volt battery with 4.0 amp-hours will often outlast a 48-volt battery with only 2.0 amp-hours, even though the second number looks bigger on the box.

I keep a spare battery charged for both test mowers now. It costs extra upfront, but it means I never stop mid-yard to wait an hour for a recharge. For anyone with a yard over half an acre, a second battery isn’t optional, it’s the only way to finish in one session.

Cutting Width and Deck Size

A wider deck means fewer passes across your yard. Black+Decker’s popular models cut a 16-inch swath. Sun Joe’s comparable models cut 16 to 20 inches depending on the version.

For a small suburban lot, 16 inches is plenty. For a half-acre or more, the extra width on Sun Joe’s larger models saves real time.

Deck size also affects storage and maneuvering. A narrower deck fits through tighter gates and around garden beds more easily. My Tampa yard has a narrow side gate, barely 24 inches wide, and the 16-inch Black+Decker slides through it without a scratch. The wider Sun Joe models need a bit more clearance.

Self-Propelled vs. Push Mowers

Self-propelled mowers drive themselves forward. You just steer and guide. This matters most if you have hills, thick grass, or a bad back.

Black+Decker’s budget line skips self-propel entirely. Sun Joe offers a few self-propelled models, though they cost noticeably more than the push versions. If your yard is flat and small, you likely don’t need this feature at all.

I tested the self-propel feature on a sloped section of a friend’s yard outside Minneapolis. The difference was obvious within the first pass. Pushing a 44-pound mower uphill is real work. Letting the mower pull itself while I steered felt almost lazy by comparison, in the best way.

Mulching, Bagging, and Side Discharge

Most models from both brands do all three: mulch clippings back into the lawn, bag them for disposal, or discharge them out the side. Switching between modes usually takes a plastic plug and a lever, nothing complicated.

I mulch most of the season and bag only in early spring when Minnesota grass grows fast and thick. Both brands handle that switch in under a minute.

One small difference: Sun Joe’s bagging attachments clip on more securely in my testing. Black+Decker’s bags worked fine but popped loose once when I hit a bump, scattering clippings across a section I’d already cleared. It wasn’t a huge deal, but it’s the kind of detail you only notice after weeks of regular mowing.

Noise Level and Blade Speed

Both brands run far quieter than any gas mower, but they’re not silent. Blade speed affects both cut quality and noise, faster blades cut cleaner but tend to hum louder.

Black+Decker’s brushed motors sit around 70-75 decibels at full speed, close to a normal vacuum cleaner. Sun Joe’s brushless models run slightly quieter, closer to 65-70 decibels, since brushless motors produce less mechanical friction. On an early Saturday morning, that difference is noticeable to a sleepy neighbor.

Comparison Table – Black+Decker vs Sun Joe Specs

Black+Decker vs Sun Joe: My Model-by-Model Testing Results

I ran five models from each brand through the same test: same yard, same grass height, same weather window when possible. Here’s what came out on top in each category.

For each category below, I picked a winner based on real testing results, not spec sheets alone. A mower can look great on paper and still disappoint once the battery drains halfway through a yard.

Best Overall

The Sun Joe iON16LM took this spot. It has a brushless motor, which runs cooler and lasts longer than the brushed motors in cheaper mowers. Blade speed stayed consistent even in thick grass, where cheaper mowers usually stall out.

I ran this mower through six weeks of regular use on my own lawn. It started every single time, first try, no exceptions. The cutting height adjustment lever is easy to reach without bending down, which matters more than it sounds like after the tenth pass across a yard.

The one real complaint: the grass catcher fills up faster than I expected on thick spring grass, so I found myself emptying it twice as often as I did with narrower-deck mowers.

Best for Small Yards

The Black+Decker CM1636 is the pick here. It’s light enough to lift into a car trunk, and a small yard doesn’t need the extra power Sun Joe offers. Less weight means less strain pushing it around tight corners.

I used this mower for a neighbor’s small front yard, under 2,000 square feet, and it finished the job in under 12 minutes on a single charge. For anyone with a small city lot or a townhouse yard, this is more mower than you actually need, and that’s a good thing when it comes to price.

Best for Large Lawns

The Sun Joe iON17LM won this one easily. The wider 17-inch deck cut my testing time by almost 20% on a half-acre lot compared to the 16-inch models.

On a half-acre Minneapolis-area yard, this mower finished in just under 35 minutes, with battery charge to spare. The extra inch of deck width doesn’t sound like much, but across a large lawn it adds up to several fewer passes and noticeably less time under the sun.

Best Budget Pick

Black+Decker’s CM1640 is the cheapest mower in this comparison that still performs well. It lacks extra features, but the core cutting job gets done for a lower price than anything comparable from Sun Joe.

There’s no self-propel, no brushless motor, and the grass catcher is smaller than the pricier models. But for a homeowner mowing a small, flat yard twice a month, none of that matters much. It cuts grass, it starts every time, and it costs less than dinner for four at a decent restaurant.

Best Self-Propelled Option

Sun Joe’s self-propelled iON21LM-CT was the clear winner, mostly because Black+Decker doesn’t offer a true self-propelled model in this price bracket. If self-propel matters to you, Sun Joe is your only real option here.

The self-propel speed is adjustable, which I appreciated on a yard with both flat sections and a slope near the back fence. I could slow it down near garden beds and speed it up across open lawn without breaking stride.

Comparison Table – Price vs Performance

How Each Brand Holds Up in Real Conditions

Specs only tell part of the story. Real weather and real grass change how these mowers actually perform. I tested both brands across three states over several weeks to see how they held up outside a showroom.

Hot and Humid Climates (Florida, Texas, Southeast)

In my Tampa test, both brands handled humidity fine. The bigger issue was grass moisture. St. Augustine grass, common across Florida yards, mats down after rain and clogs the deck faster on both brands. Sun Joe’s wider deck clogged less often thanks to more clearance.

Florida afternoon storms mean I often mow in the narrow dry window between rain showers. Both mowers started fine on humid mornings, no hesitation, no damp battery issues. The smell of fresh-cut St. Augustine grass right after a storm is one of my favorite parts of the job, even if the mower itself doesn’t care about the weather.

Dry and Rocky Terrain (Southwest, Arizona)

Phoenix summer testing was rough on both mowers, but rougher on the batteries. Sun Joe’s battery pack ran noticeably warmer during peak afternoon heat, and I had to let it cool before recharging twice. Black+Decker’s smaller battery didn’t overheat, but it also didn’t have the power to handle dry, wiry desert grass as well.

Desert lawns often mix in rocks, dry patches, and sparse Bermuda grass. Neither mower loves rocky ground. I dented the underside of the Sun Joe deck slightly after clipping a hidden rock, a reminder to walk your yard first before mowing in unfamiliar terrain. Mowing early in the morning, before the Phoenix heat climbs past 90 degrees, kept both batteries running cooler and closer to their rated runtime.

Thick Grass and Midwest Lawns

Minnesota spring grass grows fast after snowmelt, and thick, wet grass is the hardest test for any electric mower. Sun Joe’s brushless motor pulled through without bogging down. Black+Decker’s base model struggled here, stalling twice until I raised the cutting height.

There’s a specific frustration to a stalled mower in cold, wet Minnesota grass, standing there in a light jacket, restarting the motor for the third time. Once I raised the Black+Decker’s deck by half an inch, it handled the rest of the mow without another stall. Lesson learned: cutting height should change with the season, and grass type matters as much as yard size.

Comparison Table – Runtime by Climate

Common Mistakes People Make When Choosing Between Them

A lot of buyers pick based on price alone or skip reading the fine print on charging. Both mistakes cost time and money later.

Assuming Price Means Better Performance

Sun Joe’s higher price tag doesn’t always mean a better fit. If you have a small, flat yard, you’re paying for power you’ll never use. Black+Decker’s cheaper models handle small yards just as well for less money.

I’ve watched neighbors buy the most expensive self-propelled Sun Joe for a yard smaller than a parking space. They spent an extra $150 for power and speed they never needed. Match the mower to your actual lawn size, not to the biggest number on the shelf.

Ignoring Charging Time and Battery Compatibility

Not all Black+Decker batteries work across all models, and the same goes for Sun Joe. Check the exact battery platform before buying a spare. I learned this the hard way after buying a battery that didn’t fit my own mower.

Charging time also varies more than people expect. A 90-minute charge time sounds fine until you’re standing in the yard with a dead battery and 20 minutes of mowing left. If your yard takes longer than one battery charge to finish, budget for a second battery from day one instead of discovering the gap mid-mow.

Here’s the full picture side by side, based on everything I found across six weeks of testing in three states.

Pros and Cons Table – Black+Decker vs Sun Joe

My Final Recommendation

After testing both brands across three very different climates, I don’t think either one is the clear winner for everybody. It depends on your yard.

If you have a small, flat lawn and want the lightest, cheapest option that just works, Black+Decker is the better fit. I still keep my CM1636 in the garage for quick touch-ups between bigger mows.

If your grass grows thick, your yard is bigger than a quarter acre, or you deal with hills, spend the extra money on Sun Joe. The iON16LM earned its spot as my daily mower this season, and the brushless motor has held up better than I expected after months of Florida humidity and Minnesota mud.

Price matters too, and I get that. Not everyone wants to spend $300 or more on a mower for a yard the size of a two-car garage. If that’s your situation, buy the Black+Decker CM1640 and don’t look back. It won’t win a spec sheet contest against Sun Joe, but it will cut your grass every week without complaint.

What I wouldn’t do is buy either brand’s cheapest model for a yard it wasn’t built for. I made that mistake early on, running a light-duty mower through thick, wet grass it couldn’t handle, and I ended up buying a second mower within a year. Match the machine to your actual yard, not the one you wish you had, and either brand will serve you well for seasons to come.

Frequently Asked Questions

Is Black+Decker or Sun Joe better for small yards?

Black+Decker is the better fit for small yards. It’s lighter, cheaper, and doesn’t need the extra power that Sun Joe’s larger decks offer.

Which brand has a longer battery runtime?

Sun Joe generally runs longer per charge, especially in thick grass, thanks to its higher voltage options and brushless motor on select models.

Do Black+Decker and Sun Joe batteries work in other brand mowers?

No. Both brands use proprietary battery platforms, so a Black+Decker battery won’t fit a Sun Joe mower and vice versa.

Which mower is quieter, Black+Decker or Sun Joe?

Both run quieter than a gas mower, but Sun Joe’s brushless models measured slightly lower on my sound meter, around 65-70 decibels compared to 70-75 decibels for Black+Decker’s brushed motor.

Is a self-propelled mower worth the extra cost?

If you have hills, thick grass, or physical limitations, yes. If your yard is flat and under a quarter acre, a push mower from either brand will save you money without costing much effort.