Best Bosch GRT18V-40N 18V Brushless 16-Inch Cordless

Q: Does the trimmer have reverse, and what warranty applies?

The Bosch page lists reverse as No. It also states that Bosch 18v cordless power tools are covered by a five-year limited warranty. The listing gives the same five-year term.

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Someone typing “best bosch grt18v-40n 18v brushless 16-inch cordless” wants to know whether this trimmer suits edging and trimming work, and what they must buy to run it. The Bosch GRT18V-40N is a brushless 18V string trimmer with a 16-inch cutting swath, sold as a bare tool. The listing says the battery and charger are sold separately. The Bosch page lists only the trimmer as included. The two sources disagree on weight, and the listing and the Bosch page both state a five-year limited warranty for Bosch 18V tools.

Quick answer

It is a bare tool. The listing says “The battery and charger are sold separately”, and the Bosch page lists only “(1) GRT18V-40 18V String Trimmer” as included.
Both sources describe a 16-inch cutting swath. The listing gives a brushless motor with a max speed of 5,300 RPMs, a claim the Bosch page repeats.
The sources disagree on weight: the listing says 12.7 pounds and the Bosch page says 9.9 pounds. Check the figure before you plan to carry the trimmer.
The trimmer has no reverse, according to the Bosch page, and it has a wire guard. The listing names neither feature.

The product at a glance

The table sets the stored listing record for ASIN B0GM2SJKRQ, dated 2026-10-23, beside the Bosch product page for model GRT18V-40N, opened 2026-10-28. Where a source is silent, the cell says “not stated”. Where the two sources differ, the row is marked.

Item	Stored listing (B0GM2SJKRQ)	Bosch page (GRT18V-40N)
Brand	Bosch	Bosch
Type	String trimmer and edger, bare tool	String trimmer
Included	Trimmer only; battery and charger sold separately	(1) GRT18V-40 18V String Trimmer; no battery or charger listed
Voltage and platform	18V Bosch platform	18V cordless power tools
Motor	Brushless; max speed 5,300 RPMs (listing claim)	Brushless motor, max speed 5,300 rpms
Cutting width	16 inches	16 in cutting swath
Speed control	Variable-speed trigger	Variable Speed: Yes
Item weight	12.7 pounds (conflicts with the Bosch page)	9.9 lb (conflicts with the listing)
Reverse	not stated	No
Wire guard	not stated	Yes (protects tree and shrubs)
Line	not stated	Compatible with 0.080 in and 0.095 in trimmer lines
Spool	Pro-Tap spool with EasyWind	Pro-tap spool and EasyWind spool named
Cutting head	Bosch-Exclusive Anti-Tangle System	Bosch-Exclusive Anti-Tangle System
Warranty	Five-year limited (for Bosch 18V cordless tools)	Five-year limited (for Bosch 18V cordless tools)

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Who it suits

The clearest buyer is someone who already owns Bosch 18V tools. The listing says the battery and charger are sold separately “allowing you to expand your existing Bosch 18V toolkit.” That wording assumes a battery and charger are already in hand, so the trimmer adds a head to a toolkit rather than starting one.

Plan the battery as a separate purchase. The listing does not name a battery model, a capacity or a charger, so those choices fall to you. Check that the battery and charger you pick are Bosch 18V products before you order. The listing describes the Bosch 18V batteries and chargers as compatible with Bosch 18V tools, which is the match this trimmer needs.

Owners who want one head for trimming and edging

The listing describes a “dual-function hand grip and toolless adjustable D-handle” that lets the user “switch from trimming to edging”. The Bosch page calls the trimmer “the ideal cordless solution for tackling tough weeds and precise edging applications.” Those are the maker’s descriptions. The USU extension page we opened is a general guide, and it says that “Although it is more work, finished, neat edges can make a landscape look polished and attractive.” That sets the job the trimmer is meant to do without saying how well it does it.

Buyers who want a line size they can check

The Bosch page states that the trimmer is “compatible with 0080 in and 0095 in trimmer lines.” Check the line on the spool before you buy replacement line, because the listing does not give a line size. Our DEWALT FlexVolt 60V Max string trimmer post covers a different cordless trimmer, which is useful if you are comparing platforms.

Readers weighing battery trimmers against corded ones

The Virginia Tech factsheet on powered hand tools says that “Electric trimmers are relatively light and easy to maneuver and operate.” It also says that “Battery-powered trimmers are also available.” It adds that electric trimmers “lack flexibility, and the length of the power cord limits the area that can be covered.” A battery trimmer removes the cord limit, but the battery then sets the working time, and the listing does not state a runtime for this trimmer. For a side-by-side look at two other cordless string trimmers, see our Greenworks and EGO Power+ string trimmer comparison.

Skip it if

You need a battery and charger in the box. The listing says they are sold separately, and the Bosch page lists only the trimmer. Plan on buying a compatible Bosch 18V battery and charger if you do not own them.
You need a confirmed weight. The two sources differ by 2.8 pounds, so until you settle that, do not plan carrying or overhead work around either figure.
You want reverse. The Bosch page’s specification table answers no to reverse, so a stopped blade cannot be backed out of a tight spot with this model.
You need a battery platform other than Bosch 18V. The listing describes multi-brand battery compatibility, but it does not name the other tools, so do not buy on the assumption that a different brand’s battery will fit.
You need a stated battery runtime. Neither source gives one for this trimmer, so runtime depends on the battery you choose.

What the listing does not say

A bare tool listing leaves out the parts that decide how long a session lasts. For this trimmer, the stored listing and the Bosch page both leave the following open:

Battery and charger. The listing says they are sold separately. The Bosch page we opened does not say whether they are included, so this post treats them as not included.
Battery capacity and runtime. Neither source gives an amp-hour rating or a run time. The listing’s “extended runtime” phrase is a claim with no stated condition.
Weight. The listing gives “Item Weight: 12.7 pounds”. The Bosch page gives “Weight 9.9 lb”. This post does not choose between them.
Battery compatibility. The listing says “The 18V batteries and chargers are compatible with Bosch 18V tools and products from other AMPShare brands.” It does not name those brands. That sentence describes the batteries and chargers, not this trimmer running on another brand’s battery, and this post does not read it that way.
Line size on the listing. The listing does not state it. The Bosch page does, which is why the line size in this post comes from the Bosch page.

The listing also makes performance claims, including that the brushless motor “delivers a max speed of 5,300 RPMs” and that the variable-speed trigger “gives you precise control.” These are the seller’s statements. The Bosch page repeats the speed figure. Neither source gives a cutting result in tall grass or in a particular weed type.

Care and safety the sources cover

The Ohioline factsheet on handheld trimmers and brush cutters advises that you “Inspect the area where the equipment will be used, and remove all visible stones, sticks, wires or other debris.” It also says to “Wear safety glasses with side shields or goggles to protect the face and eyes from flying debris when using the cutting attachments.” The Virginia Tech guide adds that “String trimmers are known to throw stones, sticks, and other objects at high speeds.” Clear the area before you start, and wear eye protection every time.

Edging with this trimmer

Edging is a separate task from trimming, and the USU guide frames it that way. It says “Design the landscaped area so it requires a minimal amount of edging or trimming.” Fewer bed edges means less edging work. The Bosch listing’s toolless D-handle is useful for switching between the two tasks, but the sources do not compare that handle with other edging methods.

Checklist before you buy

Confirm the weight first, since the two sources give 12.7 and 9.9 pounds.
Decide on the battery and charger as a separate purchase, and confirm both are Bosch 18V products.
Check the spool for the line size, since the Bosch page gives 0080 in and 0095 in lines and the listing gives none.
Compare the head with other cordless options before you commit. Our EGO Power+ and WORKPRO trimmers and accessories comparison is one place to start.

Mistakes to avoid

Buying the trimmer and assuming a battery is included. The listing states that they are sold separately.
Treating one weight figure as settled. The two sources give different weights, so neither should be used for planning without a check.
Buying line without checking the spool. The Bosch page gives the compatible sizes, and the listing gives none.
Expecting reverse. The Bosch page says the trimmer has no reverse.

How we chose

This post covers one product: the Bosch GRT18V-40N 18V brushless 16-inch cordless string trimmer, ASIN B0GM2SJKRQ, listed as a bare tool. It is here because the keyword names the model, the battery platform and the cutting width, and those three details decide whether the trimmer fits a buyer’s existing battery and lawn.

The listing data comes from a stored scan record checked on 2026-10-23, and the text used here is the saved copy of that record. The Bosch product page for GRT18V-40N was opened on 2026-10-28. Our search also turned up a kit version of the trimmer with a battery and charger. We did not open that kit listing, and this post does not cover it.

No ranking is claimed. This post does not compare the GRT18V-40N with other trimmers or with other Bosch models.

What we could not verify

Several points stay open. The sources we opened do not settle them:

The correct weight. The listing says 12.7 pounds and the Bosch page says 9.9 pounds.
Battery capacity, battery runtime and the charger model that works with this trimmer.
How the trimmer performs on dense grass, thick weeds or edges against hard surfaces. The sources give no performance results.
Whether the 16-inch cutting swath clears more ground per pass than other trimmers. The listing says it does, but the sources give no comparison.
Whether the listing record still matches the seller’s current page, which was stored on 2026-10-23.

FAQ

Does the Bosch GRT18V-40N come with a battery and charger?

No, according to the sources we opened. The listing says the battery and charger are sold separately, and the Bosch page lists only the trimmer as included. Buy a compatible Bosch 18V battery and charger if you do not already own them.

What cutting width does the trimmer have?

Both sources give a 16-inch cutting swath. The listing gives “Cutting Width: 16 inches”, and the Bosch page gives “16 in cutting swath”.

Is the motor brushless?

The listing title and bullets describe a brushless motor. The Bosch page says “Brushless motor – delivers a max speed of 5,300 rpms.” Both sources describe the motor as brushless.

How much does it weigh?

The sources disagree. The listing gives 12.7 pounds and the Bosch page gives 9.9 pounds. Confirm the figure before you plan to carry the trimmer for long periods.

What line size does it take?

The Bosch page says the trimmer is compatible with 0080 in and 0095 in trimmer lines. The listing does not state a line size, so check the spool or the manual before you buy replacement line.

Does the trimmer have reverse, and what warranty applies?

The Bosch page lists reverse as “No”. It also states that “Bosch 18v cordless power tools are covered by a five-year limited warranty.” The listing gives the same five-year term.

Bottom line

Buy this trimmer only if you already own a compatible Bosch 18V battery and charger, or you are ready to buy them, and confirm the weight with the seller before you plan any carrying. If you need a battery and charger in the box or a confirmed weight, choose a listing that states both.

Sources

Bosch GRT18V-40N 18V Brushless 16-Inch Cordless String Trimmer, stored listing (opened 2026-10-23) https://www.amazon.com/dp/B0GM2SJKRQ
GRT18V-40N 18V String Trimmers, Bosch Power Tools (opened 2026-10-28) https://www.boschtools.com/us/en/products/grt18v-40n-06008D0110
Handheld Trimmers and Brush Cutters, Ohioline (opened 2026-10-22) https://ohioline.osu.edu/factsheet/aex-79037
Powered Hand Tools Safety: Lawn Care Training Guide, Virginia Tech (opened 2026-10-22) https://pubs.ext.vt.edu/BSE/BSE-50/BSE-50.html
Tips for Edging Your Lawn, Utah State University Extension (opened 2026-10-22) https://extension.usu.edu/archive/tips-for-edging-your-lawn