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FSA 45

FSA 45
An affordable string trimmer including a built-in battery and adjustable shaft length.

Model Features

  • Reduced-Emission Engine Technology - Caring for Nature
    The STIHL Inc. “Caring for Nature” seal identifies its powered products that are more environmentally conscious, producing zero or low exhaust emissions. STIHL Inc. defines “low exhaust emissions” as being cleaner than EPA and/or CARB exhaust emission standards.

    More information

  • Loop Handle
    A thumb screw allows the ergonomic loop handle to be easily adjusted to the desired position without tools.
  • Adjustable front handle 
    The front handle is easily adjustable (360-degree rotation) for comfort.


23 cm (9")
RUN TIME (w/ Integrated Battery)
With STIHL PolyCut™: Up to 20 min.
With line: Up to 12 min.
WEIGHT (w/ Integrated Battery)
2.3 kg (5.1 lbs.)
Weight without cutting attachment or guard. Comes with integrated battery and charger.

Important Information

WARNING! Improper use of any trimmer/brushcutter can cause serious or fatal injury. Read, understand and follow all safety instructions in your instruction manual. To reduce the risk of injury from blade contact, circular saw blades may be used on FS brushcutters that have a limitstop, a bicycle handle and double shoulder harness and not on FS brushcutters with a "J" handle or loop handle. Other rigid blades may be used on FS brushcutters having a bicycle handle, a "J" handle or a loop handle equipped with a barrier bar. To reduce the risk of eye injury always wear proper eye protection. Always use the appropriate deflector for the type of cutting attachment, as explained in your instruction manual.

Note: STIHL engine products with the Caring for Nature logo are cleaner than EPA Standards for exhaust emissions.

WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.


FSA 45 is rated 2.7 out of 5 by 7.
Rated 1 out of 5 by from DO NO BUY! I have been buying Stihl gas products (trimmer, blower and hedge trimmer) for over 30 years. They are remarkable and require little maintenance. I gave that equipment to my son before moving to a community where lawn care was provided. I decided to invest in the battery powered trimmer after realizing the lawn crew was taking nicks out of the concrete around the edge of the house. Be warned, the plastic blades did far more damage in one day than the lawn crew did in a year! Since this model cannot be adapted to a string trimmer, I will look for a Stihl string trimmer. Dissaponted!
Date published: 2017-05-13
Rated 1 out of 5 by from Beware of blades The blades for this product last for one use, and are relatively expensive. The trimmer line option involves very thin line which only lasts about three or four linear feet of trimming. Upset that I wasted my money. Definitely need to consider models that have more traditional line and feed features in the trimmer head.
Date published: 2017-05-12
Rated 1 out of 5 by from Blades Dealer did not tell me not to use around fences and my concrete edging (flower garden) went through all blades .wasted my money
Date published: 2017-04-24
Rated 5 out of 5 by from Great little trimmer! I bought this trimmer to trim around my flower beds, while my husband uses the big gas trimmer elsewhere. My arm still lacks strength due to an extensive shoulder surgery, but this trimmer is very easy to handle and so adjustable that I have no problems with using it. My only recommendation is that the FSA 45 has a built-in battery, and I don't get everything done before the battery runs out (that is why is rated the POWER as GOOD and not excellent. (I do have several flower beds!) This is a perfect little trimmer for someone with a smaller area, but I wish I would have spent a few more bucks and got the next size up model, so I could have an extra battery ready to go when the first one tired out. OVERALL a great product!
Date published: 2017-04-18
Rated 5 out of 5 by from Good little unit I bought this for my 9 year old son to use when I work nights for a few weeks, so he can help me out. Super easy to change blades, lightweight and endlessly able to reconfigure the setup. Short, tall, head angle, foregrip handle......All adjustable. I own many Stihl products, and have yet to have any complaints. This is a great unit for youngsters, elderly, and the occasional person that may not be able to handle the weight of heavier gas trimmers. All that being said, this is NOT anything like my fs130r. If you're buying this thinking it's gonna have endless power and can stand up to a residential or commercial gas powered unit, it's not. Buy it for what it is, a small battery operated trimmer that is super easy to setup and use.
Date published: 2017-04-15
Rated 5 out of 5 by from This product is simple to use. I purchased this trimmer for use on my small yard in areas where grass grows between flowers, bushes, trees, etc. For an 18V trimmer, this one feels impressive and emits a kind of quiet power. I took it to a section under one of my trees that had roughly 8" of grass around it's base which I had left from mowing the day before. The trimmer trimmed around the tree while cutting the grass efficiently. I worked on several areas before it started to rain and it did a wonderful job. I used only 1/2 the battery life during the time I was trimming. This unit has two snap on cutters and spare cutters at the underside of the handle. The cutters held up well until I accidently hit a fence pole which damaged them slightly so when I trim again, I will replace them which by the way is a snap.At clean up, I noticed a couple of areas on the trimmer that hold grass and though these are easy to clean, I would recommend making sure they are cleaned after each use or the could become clogged the debris thusly making it really hard should someone need to professionally take the unit apart.All in all, I would say this is a great trimmer for anyone whom has a smaller yard or is simply looking for a cordless trimmer to do light gardening chores. To me, it's a winner!
Date published: 2017-04-13
Rated 1 out of 5 by from Don't buy this I bought this trimmer yesterday and I'm returning it tomorrow! The plastic blades are a joke. I used all 8 that came with it and only trimmed a fourth of my yard. Also it kept shutting off during use. I bought it because of the Stihl name. Big mistake
Date published: 2017-04-09
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You Will Also Need

For Your Safety


Product Instruction Manual (PDF)

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Download Instructions on How to Rewind Your Trimmer Head (PDF)

Product Safety Manual (PDF)

STIHL Limited Warranty

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