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Gen4 40-volt 15-in Straight Shaft Battery String Trimmer 4.0 Ah (Battery Included) (Charger Included)

Ratings & Reviews for Kobalt Gen4 40-volt 15-in Straight Shaft Battery String Trimmer 4.0 Ah (Battery Included) (Charger Included)

4.1
1192
Review
 4.1 out of 5
1192 Reviews


71% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

Customers overwhelmingly praise this cordless trimmer for its lightweight design, powerful cutting ability, and exceptional battery life that rivals gas models. Many highlight how easy it is to handle for extended periods without fatigue, with excellent balance and ergonomics. Reviewers consistently report trimming entire yards on a single charge while noting the convenience of no fuel, oil, or maintenance required. The intuitive assembly and quiet operation appeal to most users. However, some customers report issues with the string feed mechanism and difficulty restringing the bump head, while a few express frustration over replacement parts availability. Despite these drawbacks, most consider it an excellent choice for small to medium yards.

Customer review summary generated by AI, including incentivized reviews.
1192 Customer Reviews

Quality and affordable

Would Recommend

I have 2 batteries and this product is interchangeable with it and other lawn products I own. Love that !!

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Great battery trimmer

Would Recommend

works great. i had an electric trimmer previously and hated the cord.

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Great product

Would Not Recommend

Great performance and easy to use

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Solid string trimmer

Would Recommend

We had about knee high weeds around our garden beds, and this guy did the trick. I'm sure we'll use it lots in the future!

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OUTSTANDING OPERATION AND BATTERY LIFE

Would Recommend

The Kobalt 40V weedeater has lived up to my expectations and beyond. It works extremely well with a wide reach and incredible battery life.

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Goodbye weeds

Would Recommend

Easy to use

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Does what it supposed to do

Would Recommend

Quick

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Buy extra cord, doesn't come with extra

Would Recommend

User friendly

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Useful

Would Recommend

Useful

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Not good even for temporary use

Would Not Recommend

Extremely POOR!! Does not run full power with load. Only when "cutting" air. Short 20-30 max run time. Unable to load string when reloading. Spring too hard & won't snap back together. Must be a "one spool" use & then exchange for replacement unit. STAY AWAY or find out for yourself.

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Response from Kobalt Team

Hi John! Thank you for reviewing your Kobalt KST 1040A-03 15" straight shaft string trimmer. We're sorry it was not powerful enough and that ...

Kobalt TeamMay 11, 2026

Chervon-Kobalt

No need for gas

Would Recommend

Just as good as gas but safer on the ears.

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The battery charge quickly and last a long time

Would Recommend

It is very light to handle and very practical, I can't find anything negative about it highly recommended

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fairly light

Would Recommend

Like the fact that battery last a long time

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