Updated on September 5, 2026
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The BLACK+DECKER CM2043C is a 20-inch cordless push mower packaged with two 40V Max 2.0Ah batteries and a charger. It can mulch, bag, or side discharge, adjusts from 1.5 to 4 inches, and uses EDGEMAX deck shaping to cut closer to borders.
The mower requires only one battery at a time. The second included pack extends the total session after a manual swap; it does not increase voltage or power. BLACK+DECKER recommends the CM2043C for lawns up to one-quarter acre, which is a more credible target than an unrelated marketing panel on the same page that mentions much larger lawns.
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BLACK+DECKER CM2043C specifications
- Deck: 20 inches
- Power: 40V Max lithium-ion; 36V nominal
- Included batteries: two LBX2040 2.0Ah packs
- Batteries required: one at a time
- Stored energy: 80 watt-hours per 2.0Ah pack; 160 watt-hours total across both packs
- Charger: wall-mountable charging base
- Listed charge time: approximately 90 minutes per battery
- Drive: manual push
- Cutting height: single lever, 1.5 to 4 inches
- Clipping modes: mulch, rear bag, or side discharge
- Weight: about 53.6 pounds
- Storage: tool-free folding handle
- Warranty: verify current coverage with the seller and product documentation
How the two-battery package works
The CM2043C has one active battery position. When the first 2.0Ah pack is depleted, remove it and install the second charged pack. This gives twice the total energy of a one-battery kit, but it requires a mid-job stop.
The supplied charger handles one battery at a time. If both packs are empty, total recovery time is longer than the 90-minute figure for a single pack. Owners who mow frequently may benefit from a second compatible charger, but its cost should be compared with a newer kit that includes higher-capacity batteries or faster charging.
Battery age matters on this older platform. When buying used or marketplace stock, check the date and condition of both LBX2040 packs. A mower price is less attractive if the batteries soon need replacement.
Best yard size and runtime
BLACK+DECKER’s detailed product description says the CM2043C is suited to lawns up to one-quarter acre. That is the figure we would use. A maintained, flat, open lawn gives the two small batteries the best chance of finishing. Thick grass, low cuts, damp conditions, bagging, and repeated starts reduce coverage.
The 20-inch deck covers ground much faster than a compact 14- or 16-inch mower. The tradeoff is a 53.6-pound machine that still has to be pushed. On hills, a self-propelled mower may be worth the extra cost.
Cutting height and EDGEMAX
A single lever changes cutting height anywhere from 1.5 to 4 inches. That broad range accommodates many warm-season and cool-season grasses. Start high when grass is overgrown and lower the deck in a later pass.
EDGEMAX reduces the gap between the blade path and one side of the deck, allowing a closer pass along fences and landscape borders. It can reduce string-trimmer cleanup but will not eliminate trimming around posts, curved beds, and walls.
Mulch, bag, or side discharge
The CM2043C supports all three common clipping methods. Mulching is efficient when grass is dry and mowed frequently. Rear bagging provides the cleanest finish but adds weight and emptying stops. Side discharge handles taller growth with less airflow restriction.
Confirm that a marketplace listing includes the grass bag, mulch hardware, side chute, both batteries, and charger. Photos and generic product titles are not a reliable substitute for an included-items list.
Our research method
Our reviews are research-based. We compare official specifications, manuals, warranty terms, owner feedback patterns, current availability, and competing products. Unless we specifically say otherwise, the product has not been personally tested by our editorial team.
Handling, storage, and maintenance
The mower’s push design avoids a traction system and its maintenance, but 53.6 pounds is not ultralight. The folding handle reduces storage space without tools. Remove the battery before cleaning or blade work, brush dry clippings from the deck, inspect the bag and blade, and keep the mower and batteries in a dry location.
BLACK+DECKER still maintains official product and support pages for the CM2043C. Replacement batteries, blades, and other parts should be matched using the complete mower model and type number.
CM2043C versus newer cordless mowers
The BLACK+DECKER has a full 20-inch deck, three clipping modes, and two batteries at a generally accessible price. Its two 2.0Ah packs provide modest total energy, and the single-battery design requires a manual swap. Newer dual-battery mowers often use both packs together for higher output or switch banks automatically.
The Greenworks LME474 includes two 4.0Ah 24V batteries and a 20-inch deck. The WORX WG751.3 uses two 20V 4.0Ah batteries simultaneously and adds a brushless motor and steel deck. For a lighter small-lawn choice, see the Greenworks 25322.
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Pros and cons
Pros
- Full 20-inch deck
- Two batteries and charger included
- Mulch, bag, and side-discharge modes
- Wide 1.5-to-4-inch height range
- EDGEMAX can reduce border trimming
- Folding handle for compact storage
Cons
- Small 2.0Ah batteries by current mower standards
- Manual battery swap and one-pack charger
- Not self-propelled
- Marketplace batteries may be older stock
- Official page contains conflicting yard-size marketing
Frequently asked questions
Does the CM2043C use both batteries at once?
No. It operates on one 40V Max battery at a time. Swap to the second pack when the first is depleted.
How large a lawn can it mow?
BLACK+DECKER’s detailed description recommends up to one-quarter acre. Actual coverage depends on grass, terrain, cutting mode, and battery condition.
Is it self-propelled?
No. It is a manual-push mower.
How long does charging take?
The official specification lists about 90 minutes, generally per 2.0Ah battery on the included single-pack charger.
Can it side discharge?
Yes. It supports mulching, bagging, and side discharge when the correct accessories are present.
Verdict
The BLACK+DECKER CM2043C remains a practical quarter-acre mower when sold as a complete two-battery kit at a fair price. Its full-width deck and three clipping modes are useful. Compare battery age, replacement cost, and charging arrangement with newer higher-capacity kits before buying marketplace inventory.
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