Updated on September 5, 2026
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The CAT DG671 is a 60V Max self-propelled mower with a 21-inch steel deck, a 20-inch cutting swath, rear-wheel drive, and three clipping modes. The standard U.S. kit includes one 5.0Ah battery and charger. TorqLogic increases motor output when the mower encounters denser grass, while variable-speed propulsion reduces pushing effort.
The design is capable and unusually heavy-duty for a residential cordless mower, but buyers should examine runtime and local support. One 5.0Ah battery gives less energy reserve than many premium dual-battery kits, and CAT’s outdoor-power dealer network is smaller than those of EGO, Greenworks, or major power-tool brands.
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CAT DG671 specifications
- Voltage: 60V Max; 54V nominal
- Included battery: one DG6B5 5.0Ah lithium-ion pack
- Included charger: DG6C5 5-amp charger in the standard DG671 kit
- Motor: outer-rotor brushless with TorqLogic load response
- Drive: variable-speed rear-wheel self-propelled, up to about 3.2 mph
- Deck width: 21 inches
- Actual cutting width: 20 inches according to the CAT manual
- Blade speed: 2,800 rpm no load
- Cutting height: seven positions from 1.5 to 4 inches
- Clipping modes: mulch, rear bag, or side discharge
- Bag capacity: 2 bushels
- Weight: 66.8 pounds bare; about 73 pounds with the standard battery
- Wheels: 8-inch front and 10-inch rear
21-inch deck versus 20-inch cut
Retailers commonly describe the DG671 as a 21-inch mower. CAT’s operator manual distinguishes between the 21-inch deck and the 20-inch cutting width. Use the 20-inch figure when comparing passes with another mower.
CAT’s outdoor-power catalog describes a steel deck with a deep shape intended to improve airflow for bag filling and fine mulching. The deck is more substantial than a small composite shell but contributes to the mower’s weight. Clean out dry clippings and store it indoors to limit corrosion.
Self-propelled drive and TorqLogic
The rear-wheel drive has adjustable forward speed up to roughly 3.2 mph. Rear drive usually keeps better traction as a grass bag fills, and it helps on moderate slopes. The drive does not remove the need to guide and turn a roughly 73-pound mower, so test handle height and control reach if possible.
TorqLogic is CAT’s automatic load-response system. It raises power in thick grass and reduces output in easier conditions to preserve energy. That helps prevent bogging, but it cannot make a 5.0Ah battery deliver unlimited runtime. Tall, wet growth and aggressive self-propel speed still use more energy.
Battery runtime and the second bay
Retail listings quote roughly 35 to 45 minutes from the included 5.0Ah battery. Those figures vary because conditions and testing differ. Treat them as best-case guidance, and focus on whether one pack can finish your normal lawn with reserve.
The mower has a second battery position for expanded capacity. CAT documentation describes the dual-port design as useful for an additional battery. Confirm the exact changeover procedure in the manual for your production version. Either way, a second DG6B5 pack can prevent a mid-job charging stop.
The 5-amp charger takes approximately 60 minutes to charge a 5.0Ah pack according to CAT’s manual. CAT also lists other package suffixes with different batteries and chargers, so verify the full model and included components before ordering.
Best yard size
The DG671 is best for a small-to-medium lawn where rear-wheel drive and a full-width deck save effort. One-quarter acre is a comfortable target for the standard one-battery kit in ordinary conditions. Some maintained lawns approaching one-half acre may be possible, but a second battery is prudent.
It is a better fit for slopes than a lightweight push mower, though no walk-behind mower should be used beyond the manual’s safe-slope guidance. Wet grass reduces traction and runtime and increases clumping.
Mulch, bag, or side discharge
The three cutting modes cover normal seasonal needs. A lever allows quick switching between mulch and bag settings without inserting a separate rear mulch plug. The side-discharge chute is included for tall or heavy grass. The 2-bushel bag is larger than the bags on many compact cordless mowers.
Mulching saves disposal time and returns fine clippings to the lawn when grass is dry and cut frequently. Bagging produces a clean finish but adds weight and energy use. Side discharge is the least restrictive choice when the lawn has grown too long for efficient mulching.
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.
DG671 versus DG670
The DG671 adds variable-speed rear-wheel drive. The CAT DG670 uses the same general 60V cutting platform in a manual-push design. The DG670 is lighter and simpler; the DG671 is easier on hills and long passes.
Because propulsion draws from the same battery, flat-lawn owners who do not need assistance may get more value from the push model. Buyers comparing platforms should also read our Greenworks 60V mower review and EGO LM2150SP review.
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Parts, warranty, and service
Published retailer coverage commonly lists five years for the mower and three years for the battery and charger, but warranty handling depends on country and seller. Confirm that an Amazon marketplace seller is authorized and that your purchase qualifies before relying on the warranty.
Check local availability of the DG6B5 battery, compatible blade, bag, charger, and service before buying. A strong mower becomes poor value if a damaged accessory takes months to replace.
Pros and cons
Pros
- Variable-speed rear-wheel propulsion
- Brushless motor with automatic load response
- Steel deck and full 20-inch cutting swath
- Seven height settings from 1.5 to 4 inches
- Mulch, bag, and side-discharge modes
- Large 2-bushel grass bag
- Second battery position for expanded capacity
Cons
- Only one 5.0Ah battery in the standard kit
- Heavy at about 73 pounds ready to mow
- Smaller battery and service ecosystem than leading brands
- Runtime claims vary by retailer
- Package suffixes can include different batteries and chargers
Frequently asked questions
Is the CAT DG671 self-propelled?
Yes. It uses variable-speed rear-wheel drive with a top forward speed around 3.2 mph.
Is the cutting width 20 or 21 inches?
The deck is 21 inches wide. CAT’s manual lists the actual cutting width as 20 inches.
How many batteries are included?
The standard DG671 kit includes one 5.0Ah battery and a 5-amp charger. Other suffixes and seller bundles may differ.
How long does charging take?
CAT’s manual lists about 60 minutes for a 5.0Ah pack on the standard 5-amp charger.
Can it side discharge?
Yes. The standard kit includes a side-discharge chute, along with the bag.
Verdict
The CAT DG671 offers strong residential hardware: rear-wheel drive, a steel deck, a brushless load-sensing motor, and three clipping modes. Its main weakness is the one-battery package and a smaller support ecosystem. It is a good buy when local parts and service are available and the price leaves room for a second battery.
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