Like the battery hedge trimmer, the gas chainsaw, or the power pruner, the string trimmer ranks among the most used garden tools. Also called a edger or weed whacker, this tool is used to cut and trim grass along edges.
Compared to the electric string trimmer and gas models, the battery-powered string trimmer can be very practical. Thanks to its cordless operation, you won’t be hindered by an electric cable during all your movements.
Due to its many advantages, this equipment enjoys great success in the market. Between the Stihl FSA battery string trimmer, Black Decker GLC battery string trimmer, Bosch Universal battery string trimmer, an endless variety of products is available to you. To help you make a choice, this article lists the best battery-powered string trimmers on the market. Also, discover the essentials to know about this garden tool.
Overview of my feelings: For me, the arrival of cordless technology in edge maintenance has been a small comfort revolution. I believe that the quiet operation and absence of gasoline smell turn a noisy chore into an almost relaxing moment in the garden. My point of view is that these tools should no longer be seen as gadgets: current technology offers autonomy more than sufficient for the majority of residential gardens. It is, in my opinion, the choice of freedom because you no longer spend time untangling an extension cord or preparing a fuel mixture.
What is a battery-powered string trimmer?
The battery string trimmer or battery-powered weed whacker is an essential complement to the cordless lawn mower. It allows you to even out weeds or grass that the mowing robot does not cut. Its main advantage lies in its ability to cut vegetation in hard-to-reach places.
It is equipped with a spool of usually nylon line that can spin at full speed. For good handling, many models come with a rotating handle and telescopic tube. This battery-powered electric garden tool is specially reserved for finishing work. Despite its performance, it does not damage plants.
Whether you choose the Black Decker battery string trimmer for edges or the Stihl FSA battery string trimmer, the device is not suitable for cutting tall grass and brush. It finishes mowing the lawn in places inaccessible to the lawn mower such as sloping terrain.
More and more people confuse it with the brush cutter. While the battery-powered string trimmer is used to refine and optimize lawn trimming, the other is used to remove bushes, very tall grass, dense brush, and brambles. As its name indicates, the battery string trimmer operates using a battery. It is very practical. Maneuverable and lightweight, it offers comfort and ease of use.
I remember my beginnings with a temperamental gas model that I spent more time trying to start than using. One day, while struggling with the starter in the scorching heat, my neighbor came out with his battery-powered device, started it with a simple click, and finished his edges before I could even do a single meter. This realization was immediate: performance is useless without ease of use. I sold my gas equipment the following week. Since then, I enjoy the pleasure of being able to work on a whim in the garden, without tedious preparation and without disturbing the whole neighborhood.
Comparison of the Best Battery-Powered String Trimmers: Our Top 5
| Product Name | Weight | Dimensions | Cutting Width | Price |
| Einhell Cordless Battery-Powered String Trimmer | 1.8 kg | 96 x 19 x 12.7 cm | 240 mm | 52.95 euros |
| BLACK+DECKER STC1820PCB-XJ | 2.33 kg | 23.2 x 14 x 104.6 cm | 28 cm | 72.89 euros |
| RYOBI OLT1832 | 2.3 kg | 103.1 x 250 x 119 cm | 30 cm | 89 euros |
| BLACK+DECKER BCST918D1-QW | 2.53 kg | 105 x 23.5 cm | 28 cm | 124.99 euros |
| WORX WG163E.2 | 2.4 kg | 113.2 x 88.8 x 31.1 cm | 30.00 cm | 139.99 euros |
Einhell Cordless Battery-Powered String Trimmer
Thanks to the telescopic guide rail with integrated adjustable handle, the battery string trimmer provides optimal flexibility in every corner of the garden. Equipped with soft grip technology, the handle offers a better grip.
The device is equipped with a motor block that can tilt into 5 different positions. Thanks to these, you can easily cut weeds even under bushes and hedges.
In the additional handle, there is a practical storage compartment with 20 plastic blades. They help you trim plants in areas inaccessible to the lawn mower.
No products found.
Advantages
+ Excellent ergonomics
+ 5 possible inclinations
+20 blades included
Disadvantages
– Lack of power
BLACK+DECKER STC1820PCB-XJ
This Black Decker battery-powered string trimmer stands out with its 180° rotating head and telescopic tube with edging mode. This allows it to efficiently edge along fences and walls for a flawless result.
With the eco turbo mode, you can choose between 2 different speeds. The turbo mode is perfect for removing dense grass, while the eco mode is for fine grass.
This Black Decker battery string trimmer runs on an 18V lithium-ion battery. It is compatible with all 18V batteries from the Black Decker brand.
No products found.
Advantages
+ Turbo eco mode
+ Edger mode
+ Powerful battery
Disadvantages
– Trigger hard to hold
RYOBI OLT1832
Like the Black Decker battery-powered string trimmer, this Ryobi model offers you an edger mode for flawless finishing. You can tilt the cutting head in 3 positions to help you access difficult areas.
With a press on the trigger, its line can advance automatically for simplified use. This battery-powered string trimmer also stands out for its comfort of use. By using the adjustable handle telescopic tube, it can be adapted to your posture and height.
No products found.
Advantages
+ Tiltable cutting head
+ Assured working comfort
+ Edger mode included
Disadvantages
– Questionable durability
BLACK+DECKER BCST918D1-QW
The BLACK+DECKER 18 V BCST918D1-QW string trimmer is designed for edge maintenance, lawn finishing, and hard-to-reach areas. Its 28 cm cutting diameter allows for quick work, while the 18 V 2Ah battery offers good cordless freedom of movement. Lightweight and manageable, it easily adapts to small and medium gardens with a comfortable grip.
Technically, this 18 V cordless string trimmer features an automatic line feed system, a pivoting head for edging, a 28 cm cutting width, and a 2Ah battery with charger included. Its compact design facilitates storage, while ensuring practical use for regular lawn maintenance.
No products found.
Advantages
+ Good cutting width
+ Convenient battery included
+ Swiveling head edges
Disadvantages
– Limited power for thick weeds
WORX WG163E.2
If this battery-powered string trimmer is expensive, it is because it boasts multiple strengths. Its first asset relates to its versatility. It offers you the opportunity to change the cutting system. Thanks to this, the string trimmer can become a wheeled edger for a clean cut.
The model features an adjustable handle allowing you to handle all types of environments. With a battery voltage of 20 V, it demonstrates remarkable performance. Additionally, its cutting diameter reaches 30 cm, helping you maintain larger gardens.
No products found.
Advantages
+ Versatile battery string trimmer
+ Efficient garden tool
+ Ergonomic handle
Disadvantages
– Cutting line a bit thin
How does a battery string trimmer work?
Although the battery string trimmer is a relatively simple tool, it is important to understand how it works. This allows you to use it better and know its various components. Almost all battery string trimmers available on Amazon have a longitudinal shape. On their upper part, you find a handle. As for the lower half, there is a motor, a spool, a blade, a rotating shaft, and a protective cover.
A battery string trimmer is powered by a rechargeable battery. Many major brands such as Bosch, Black & Decker, and Ryobi prefer to use a lithium-ion battery because of its power and autonomy. To cut weeds, the battery string trimmer is equipped with a motor that drives a cutting system. This consists of a spool of nylon or plastic line. It cuts plants by rotation.
Depending on the models, the cutting width can be more or less significant. As for the cutting head, it is hidden behind the protective cover. This not only serves to protect the cutting head but also to avoid cutting shrubs and flowers while limiting projections. Some models feature a swiveling head with a telescopic tube that greatly simplifies the most complex finishing tasks.
What are the advantages of using a battery string trimmer rather than an electric corded one?
It is not surprising that more and more renowned manufacturers such as Ryobi, Bosch, Einhell or Black Decker offer several models of battery-powered string trimmers on the market. This equipment is highly sought after due to its multiple advantages.
Compared to the electric string trimmer, the battery-powered string trimmer is very popular for its optimal ease of use. Unlike the petrol model, it makes no noise throughout its operation. Even better, the battery-powered string trimmer offers greater maneuverability. Its weight sometimes does not exceed 3 or 4 kg. The market currently offers many models that weigh only 1 kg.
Unlike an electric corded string trimmer, the battery-powered string trimmer guarantees your freedom of movement. Cordless, it allows you to move easily to all corners of the garden. There is no cable to get in your way. Besides that, this cordless garden tool stands out for its autonomy. It can generally operate continuously for one hour. This may be enough to go around flower beds or garden paths.
Its power can also seem satisfactory. Whether it is a Stihl FSA battery string trimmer or the Black Decker GLC, the model offers great efficiency if we refer to the work expected from a string trimmer.
Comparison of motors for string trimmers
| Criterion | Battery model | Petrol model | Electric (corded) model |
| Tool weight | Light to medium | Heavy | Very light |
| Autonomy | Limited (depending on Ah) | Excellent | Unlimited |
| Noise pollution | Very low | Very high | Low |
| Freedom of movement | Total | Total | Restricted by cable |
| Engine maintenance | None | Significant (spark plug, filter) | None |
How long does a string trimmer battery usually last?
Whether you equip yourself with a Black Decker battery string trimmer, high-performance Bosch battery string trimmer or Stihl FSA battery string trimmer, the usage duration of a battery varies according to its nominal power and autonomy. For less powerful models of 2.4 Ah, they can operate for a maximum of 30 minutes. On the other hand, high-quality ones of 4 Ah have the capacity to perform their roles for at least 45 minutes.
Other battery-powered string trimmers on Amazon can run for up to an hour continuously. This is the case with Bosch products. It should be noted that their price is often high. If you want to optimize the usage duration of your battery-powered edger, it is better to deploy multiple batteries with a large capacity.
To enjoy it for a long time, make sure to charge the unit properly. Generally, you need to be patient for 1 to 4 hours for a full charge. Once done, the battery-powered string trimmer gives you the opportunity to use it for 30 to 60 minutes.
What is the standard voltage of a battery-powered string trimmer?
Just like the battery autonomy, the voltage varies according to the product range. The voltage of a Ryobi battery string trimmer is not necessarily the same as the battery-powered electric string trimmer from Bosch. In most cases, the battery voltage of the most common models ranges between 18 V to 36 V. For high-end models like those from Black Decker string trimmers, they are equipped with a 54 V battery.
With an 18 V battery string trimmer, you can work non-stop on a garden of up to 400 m2. If the area is far beyond this limit, it is important to use a model equipped with a 36 V battery. You can expect 45 minutes to 3 hours of full charging with these two battery products. If the battery is plugged in and becomes hot, this estimate may be extended.
How to replace a defective battery in a string trimmer?
When choosing a battery string trimmer, it is crucial to carefully examine the quality of the battery. This component guarantees the performance and durability of the tool. If it is among the cheap versions, it is possible that your string trimmer will not be able to operate for very long. It may break down overnight.
To avoid this, it is better to invest in a string trimmer equipped with a high-quality battery. Experts suggest favoring a lithium-ion battery. It is praised for its long autonomy and better longevity. When you notice that the device is not working properly, check the components. Take a look at the power supply and the switch. If everything seems normal, the battery might be defective.
It is imperative to replace it with a compatible part. Before removing it from the string trimmer, make sure the device is turned off. Then, you can press the battery release button. Now take the new battery and insert it into the string trimmer. When you hear a click, it means it is in place. Make sure it is properly locked.
Are there accessories compatible with the battery string trimmer to improve its use?
Many famous brands like Black Decker or Bosch accompany their products with practical accessories to use. They allow you to fully enjoy the battery string trimmer with every application.
Among the most functional devices, the telescopic handle with adjustable grip greatly improves the use of the tool. Other models on Amazon also come with thick gardening gloves that facilitate handling.
What criteria should be considered to choose a good battery string trimmer?
Between Stihl FSA battery string trimmer, Ryobi battery string trimmer, Black Decker battery string trimmer, many products are available on the market. To find the best model, some elements must be considered:
The battery is one of the first points to examine before purchasing a cordless string trimmer. If your garden is under 400 m2, an 18 V model will suit you very well. For an area larger than 400 m2, you need a string trimmer equipped with a 36 V battery.
Also consider the power of the device. If you want to do a perfect job, opt for a string trimmer with 500 W.
For the cutting width, it can range between 20 to 45 cm. Some string trimmers have additional blades or small knives that can replace the nylon line.
Battery string trimmer: answers to your questions for a perfect garden
The string trimmer is designed for soft grass and finishing touches along walls or flowerbeds. Then: the brush cutter has a more powerful motor and can often be fitted with a metal blade to cut brambles or tall, dense grass.
It all depends on the ampere-hour (Ah) rating of your battery: a 2.5 Ah battery generally provides 20 to 30 minutes of continuous work. Then: if you have a large area, it is highly recommended to invest in a second battery to rotate and never be interrupted.
It is preferable to use a small diameter line, generally between 1.4 mm and 1.6 mm, to avoid overloading the motor and preserve the battery. Then: favor star-shaped or twisted profile lines which offer better air penetration and thus slightly increase the autonomy of your machine.
