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Gen4 40-volt 15-in Straight Shaft Battery String Trimmer

Ratings & Reviews for Kobalt Gen4 40-volt 15-in Straight Shaft Battery String Trimmer

4.1
1264
Review
 4.1 out of 5
1270 Reviews


71% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The battery-powered trimmer provides good performance for most residential yard work, with a long-lasting battery, two speed settings, and a relatively lightweight and easy-to-use design. It cuts through grass and weeds effectively, though may struggle with thicker vegetation. The main drawbacks are the difficulty in restringing the trimmer head and the lack of availability for replacement parts. Overall, it is a solid choice for homeowners with small to medium-sized yards who want the convenience of a cordless trimmer.

Customer review summary generated by AI, including incentivized reviews.
1270 Customer Reviews

Great Battery life

Would Recommend

battery life is good

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Love it

Would Recommend

Easy quick assembly, not too heavy

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Can’t mess up!

Would Recommend

Lightweight and easy to handle. Has a safety to avoid getting hurt. Works great.

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Reliable with lots of power

Would Recommend

My second trimmer I purchased

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Very convenient and easy to use

Would Recommend

Easy charge easy to use very convenient

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LITTLE ON THE HEAVY SIDE IF YOUR SHORT

Works great

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Not impressed

Would Not Recommend

The unit bogs down in even the lightest use. The head does not feed well at all and battery life is subpar compared to other offerings on the market. I got so aggravated with the feed head that I threw the unit 20 feet and the frame snapped. I'll never purchase another Kobalt power tool.

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Response from Kobalt Team

Hi there, Micah! Thank you for your review of our 15'' Straight Shaft String Trimmer. We are very sorry to hear that this has been your exper...

Kobalt TeamMarch 30, 2026

Chervon-Kobalt

Kobalt Electric Weed Easily

Would Recommend

This Kibalt Electric trimmer exceeded my expectations. After trimming my whole yard the battery was almost fully charged still. Great price Great product!

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Works great

Would Recommend

I have a lot of weedeating to do and this weedeater is up for the task. I was concerned at first that the battery would not last to get it all done but it does. Great weedeater.

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Manufacturing error

Would Not Recommend

I am Lowe's Pro member and have purchased many Cobalt products. This is the first time that I have experienced a poor Cobalt tool that shouldn't be on the shelf. I purchased a KST 1040A-03 trimmer, bneought it home and tried to assemble it. The sting guard does not line up with the screw holes at the end of the shaft. I called Cobalt customer service and was told it is a product problem and to take it back to the store to see if they could assemble it. I called N. Myrtle Beach Lowe;s 3 times to ...

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Response from Kobalt Team

Hi there! We sincerely appreciate your review of our Straight Shaft String Trimmer and are very sorry to hear that this was your experience assemblin...

Kobalt TeamMarch 25, 2026

Chervon-Kobalt

Lite and clean.

Love it works fine ,lite easy to use and handling it for a period of time.

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Avoid

Would Not Recommend

Long time Kobalt faithful customer. This season I had to buy another weed eater(had an older model 40V Kobalt) and this thing is weak and worse than the older version. I am not sure anyone likes weed eating, but I hate my life now when I have to. This model lacks power and speed and it takes easily twice as long to do my yard now. It pains me to talk bad about Kobalt, but this might be the sign I was concerned about and it is time to find a new brand and company that doesn’t regress.

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Response from Kobalt Team

Hello James, we thank you for reviewing the Kobalt 40v String Trimmer. We are sorry to hear that the string trimmer fell below your standards regardi...

Kobalt TeamMarch 20, 2026

Chervon-Kobalt

Lightweight weedeater

Would Recommend

Light weight, has 2 speeds, good battery life for homeowner

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Would Not Recommend

String does not release, difficult to change as well

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Response from Kobalt Team

Hello there! We appreciate you reviewing the Kobalt 15" String Trimmer. We are sorry to hear that the experience with the string trimmer fell bel...

Kobalt TeamMarch 13, 2026

Chervon-Kobalt

Very durable comes ready out the box

Would Recommend

Great product 2nd time buying

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