Kobalt Gen4 40-volt, (1) 6 Ah 20-in Push Lawn Mower Battery Walk Mower,

Name: Kobalt Gen4 40-volt, (1) 6 Ah 20-in Push Lawn Mower Battery Walk Mower,
Brand: Kobalt
SKU: 5002905567
Rating: 4.2 (1681 reviews)

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4.2

1681

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The Kobalt 40-Volt Max Brushless Motor Lawn Mower provides superior performance without the noise, mess, and fumes of gas. The 40V mower offers versatility with 3-1 cutting modes along convenient push button start. Offering up to 60-minutes of cut time, the 40V mower has you covered. The included 6.0Ah battery and charger are compatible with all Kobalt 40-volt max tools and are backed by a 5-year limited warranty on the tool and a 3-year limited warranty on the battery and charger. (Additional 6.0Ah battery - item #3809905)

Brushless motor offers increased power, longer run time and prolonged motor life
20-in steel deck offers long lasting durability
3-in-1 mulching/bagging/side discharge offers versatility for any mowing style
Telescopic folding handle allows for convenient vertical storage
Single-lever 6-position deck height adjustment to quickly adjust for your preferred grass height
Push button start for easy operation
5 Year limited tool warranty and 3 year limited battery warranty
Compatible with the Kobalt 40V Family of 45+ Outdoor Tools

General
Battery Voltage	40-volt	Start Type	Push button start
Series Name	Gen4	Deck Material	Steel
Type	Push lawn mower	Adjustment Type	Single-lever
Power Source	Battery	Blade Speed (RPM)	2850
Battery Type	Lithium ion

Dimensions
Cut Height Adjustment	6-position	Mower Deck Width (Inches)	20
Cut Width (Inches)	19.5	Package Weight (lbs.)	67.79
Front Wheel Size	7-in	Rear Wheel Size	9-in
Maximum Cutting Height (Inches)	4	Weight (lbs.)	54.4
Minimum Cutting Height (Inches)	1.25

Features
Bagger Included	Yes	Lowe's Exclusive	Yes
Battery Included	Yes	Mulching Capable	Yes (included)
Battery Run Time (Minutes)	0.45	Number of Batteries Included	1
Blade Stop System	No	Removable Battery	Yes
Brushless	Yes	Self-Propelled	No
Charge Time (Hours)	3.6	Vertical Storage	Yes
Charger Included	Yes	Battery 1 Amp-Hours	6
Collapsible	Yes	Battery 2 Amp-Hours	6
Discharge Location	Rear	Engine Torque (Foot/lbs.)	1
Handle Adjustments	3

Warranty
Warranty	5-year limited

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -	Safety Listing	cUL safety listing

Compatibility
Recommended Yard Size	1/4 to 1/2 acre	Replacement Belt OEM Part Number	0
Recommended Terrain Type	Flat with obstacles	Replacement Blade OEM Part Number	KMBA 1040-03

Miscellaneous
UNSPSC	27112000

Check out the Best Selling Cordless Electric Push Lawn Mowers on Lowes.com

Review

4.2 out of 5

1681 Reviews

75% Recommend this product

Ratings may include incentivized customer reviews.

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+ 50

What Customers Are Saying

The mower provides a good cutting performance for small to medium-sized yards, with convenient features like adjustable height settings and a folding handle. The battery life is generally sufficient, though some users report needing to recharge for larger properties. While it struggles with very thick or tall grass, it excels at providing an even, clean cut on regular lawns. Overall, it is a solid choice for homeowners seeking a low-maintenance, eco-friendly alternative to gas-powered mowers, especially for smaller yards.

Customer review summary generated by AI, including incentivized reviews.

1681 Customer Reviews

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Poor reliability

Would Not Recommend

Worked on and off for a year until mower would not start. Battery would show full and mower would not start rotating blade as normal. Spend the extra cash for a reliable mower.

AustinSeptember 19, 2026

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Response from Kobalt Team

Hi Austin! Thank you for reviewing your Kobalt KPM 1040A-03 push mower kit. We're sorry to hear that it is not starting. Please make sure the sid... Read More

Kobalt TeamSeptember 21, 2026

Chervon-Kobalt

Battery powered lawnmower

Would Not Recommend

Even with a fully charged battery this does not always start and after verifying everything is in place. Not Reliable when needed.

JanGSeptember 5, 2026
Verified Purchaser

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Response from Kobalt Team

Hi there, JanG! We are sorry to hear that your mower is causing you some trouble during startup. We would love to help! Please give us a call at 1-88... Read More

Kobalt TeamSeptember 8, 2026

Chervon-Kobalt

No good

Would Not Recommend

Only lasted a year and a couple of days

TeeAugust 23, 2026

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Response from Kobalt Team

Hi Tee! Thank you for reviewing your Kobalt KPM 1040A-03 push mower kit. We're sorry to hear that mower stopped working after about a year. We’d ... Read More

Kobalt TeamAugust 25, 2026

Chervon-Kobalt

Would Recommend

Mower was good lasted me a year it runs with out the Handel being down stuck on 2 bars on a full battery now mower dosnt start or anything on a full battery

AlanAugust 13, 2026

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Response from Kobalt Team

Hi there, Alan! We're sorry to hear you're having trouble with your mower after only a year of use. We would like to take a closer look at th... Read More

Kobalt TeamAugust 13, 2026

Chervon-Kobalt

Battery issues

Would Not Recommend

Started out great when I purchased in October 2026. Didn’t get to use but once because of fall months and winter weather. When spring came around we cranked up. I learned to navigate certain issues that would stop the mower but now the battery has become the main issue. The indicator light would go from full to 1st bar in 10 minutes but would still run for a while. Now it will stop within 15 minutes of use. I have to cut my grass in increments and it can take me days to complete because it takes...

VickieAugust 1, 2026

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Response from Kobalt Team

Hi Vickie! Thank you for reviewing your Kobalt KPM 1040A-03 push mower kit. We're glad the mower works well but sorry that you are having trouble... Read More

Kobalt TeamAugust 3, 2026

Chervon-Kobalt

Worked for

Would Not Recommend

No safety switch included. Kobalt nor Lowe’s would help. Worked fine for four cutting then would not crank. Full batter. Fully extended handles. Nothing we tried worked.

BobbiJuly 28, 2026

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Response from Kobalt Team

Hi there, Bobbi! We appreciate your review. We would love to grab some more information from your regarding your experience and determine how we can ... Read More

Kobalt TeamJuly 28, 2026

Chervon-Kobalt

Thank God I got the three year warranty...

I've had this mower for two years (the last one got me 7+ years), plugged in the battery to get it started, light shows charged, then! Nothing. Now I get to see how well they uphold their warranty.

MichaelJuly 5, 2026

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Response from Kobalt Team

Hi there, Michael! We're sorry to hear you're having trouble with your mower. We understand how frustrating it can be when a unit that has se... Read More

Kobalt TeamJuly 7, 2026

Chervon-Kobalt

Mower died

Would Not Recommend

bought this July 12 2025, just died and won't run anymore. read some reviews about the same problem but if this is how kobalt now makes products than need to look at another brand. good battery and no reason to just stop working.

RoyJune 17, 2026

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Response from Kobalt Team

Hello Roy, and thank you for reviewing the Kobalt Mower. We would be happy to take a look into the mower to see how we can further assist you here if... Read More

Kobalt TeamJune 18, 2026

Chervon-Kobalt

Perfect for small or medium-sized lawns

Would Recommend

I have fairly dense fescue-bluegrass lawn blend and thick, lush coverage. It is no problem for this mower. After 30 mins, the battery still has at least 1/3 of its power left to go. It's not a beast; it is sufficient. If you want a beast to knock down overgrowth over 1/2 acre, up your voltage, but 40v is fine for my 1/4 acre of plush lawn.

PhilsterJune 12, 2026
Verified Purchaser

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		Ratings	1681
		Type	Push lawn mower
		Battery Voltage	40-volt
		Power Source	Battery
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