5 Best Cordless Weed Eater Review of 2020

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A nicely done lawn is the pride of any homeowner or landscaper. It not only looks good but also augments the appearance and beauty of the entire home. Unfortunately, this cannot be achieved with a lawn mower alone. You need a more specialized tool known as the weed eater or a string trimmer. You can choose the electric weed wacker, gas-powered weed trimmer, or even better, one of these powerful cordless weed eater tools.

A cordless weed eater/edger/trimmer is powered by lithium-ion battery. Unlike an electric weed wacker or the gas-powered model, a battery powered weed eater is not limited by the length of a power cord and does not leave you smelling like gas or exhaust. It is an eco-friendly grass trimmer that gives you a lot of freedom to cut grass and weeds on the backyard and to trim the grass on fence lines and on the edges of patios and pavements. With it, you can trim grass for as long as the battery has charge.

Since there are many cordless weed eater tools out there on the market, it may be difficult to select the best one. For that reason, we have prepared a detailed review of the 5 best cordless weed eater units on which you can place a safe bet. Some of the factors we have considered in the review include battery capacity, tool durability, tool ergonomics, price, and buyers’ opinions based on experience.

Comparison Table of 5 Best Cordless weed eaters

EGO Power Plus 15-Inch 56-Volt Lithium-Ion Cordless Brushless String Trimmer - 2.0Ah Battery and Charger KitDEWALT DCST990H1 40V MAX 6.0 Ah Lithium Ion XR String TrimmerGreenworks 14-Inch 40V Cordless String Trimmer (Attachment Capable)RYOBI 40-Volt Lithium-Ion Cordless Attachment Capable String TrimmerBlack & Decker LST136W 40V Max Lithium String Trimmer and Replacement Spool 3-Pack Bundle
Users' Ratings
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  • Features a powerful high-efficiency brushless motor.
  • Has a 49 inch long aluminum shaft
  • The cutting swath is 15 inches wide
  • Features a bump feed head
  • Uses a 0.095 inch diameter trimmer line
  • Equipped with a powerful brushless motor
  • Adjustable well-padded handle
  • It is a split-shaft weed wacker
  • Cuts 15 inches wide
  • Uses 0.080 inches dual line trim string
  • Dispenses cutting string using the bump feed mechanism
  • Equipped with a powerful brushless motor
  • Operates at speeds of 0 - 6600 RPM
  • Controlled in 2 speed settings
  • Welll padded handle
  • Weed eater is well balanced
  • Features a variable trigger for precise power and speed control
  • It is a single shaft
  • Adjustable cutting width of 14-16 inches
  • Attachment capable
  • Driven by powerful brushless motor
  • It is a 2 piece shaft
  • Charger can charge bigger greeworks batteries
  • Has a high and low speed control setting
  • Has a cutting width of 13 - 15 inches
  • Incorporates the tap-to-feed mechanism on the head
  • Grip is rubberized
  • Accepts a 0.08 inch diameter line
  • Rotates counterclockwise
  • Controlled by a variable speed trigger
  • Fits most attachment capable systems
  • Runs on a brushless motor
  • 13 inch cutting swath
  • Straight adjustable shaft
  • Requires 0.08 inch thick twisted line
  • Has a variable speed trigger
  • Features an automatic feed system
  • Equipped with a brushless motor
  • Head rotates 180 degrees
  • Has a built-in metal guide bar for edging
  1. Double string head cuts more effectively
  2. Battery is interchangeable with those of other EGO tools
  3. The bump mechanism works great to release the line
  4. Stays strong until battery dies
  5. Thick string diameter makes the unit cut thicker weeds more effectively
  6. Easy to electrically load the spool
  1. Balances well and delivers superb power
  2. Charges fairly fast
  3. Has a fairly long runtime
  4. Sturdy and durable
  5. Easy to control power and runtime with the Hi/Lo speed switch
  6. Long enough to prevent you from bending
  1. Delivers amazing torque to wack the weeds
  2. Can transform to other tools
  3. Easy to adjust string size by just bumping the head on the ground
  4. The shoulder strap takes away most of the weight
  5. Fairly priced
  6. Less vibration
  7. Well balanced
  8. Quiet enough to have a conversation with someone without having to shout
  1. Double string head for increased cutting speed
  2. Long battery life
  3. Evenly distributed weight
  4. Fairly light on your hands
  5. You can add extra attachments such as the edger, hedge trimmer, and pole saw
  6. The tap to feed head lets you control the amount of string used.
  7. Can be broken into half fo easy transportation
  8. Variable speed gives you ultimate cutting control
  9. No tool required for assembly
  1. Lightweight
  2. Durable
  3. Well balanced
  4. Easily adjustable length of the shaft for an operator's height
  5. The brushless motor is effective, durable, and delivers more power
  6. Easily transforms to a trimmer
  1. Not compatible with aftermarket attachments like blower or edger
  2. A little heavy
  3. Head does not rotate to allow you to edge easily
  4. No wheels or metal guide to assist with edging
  1. No wheels or metal guide to assist with edging
  2. Trimmer line that is thicker than 0.08" may reduce runtime
  3. Can be a little heavy when used on longer yard works
  4. Cumbersome to transport and store
  1. Quite heavy
  2. Battery does not last very long
  3. No wheels or metal guide to assist with edging
  1. Rotates counterclockwise
  2. No shoulder strap
  3. Head does not rotate to allow you to edge more easily
  4. No wheels or metal guide to assist with edging
  1. Not attachment compatible
  2. Does not have the power to easily trim very thick brush
  3. Battery takes long ( about 1 hr) to fully charge
Parts Included
  1. EGO cordless string trimmer
  2. (1)2.0Ah, 56V Lithium Ion battery
  3. Assembly hex key
  1. Dewalt Max XR Cordless Weed Trimmer
  2. One 40V Lithium Ion battery
  3. One charger
  4. Metal plate for mounting charger
  1. Greenworks cordless weed wacker
  2. (1)40V 2.0Ah Battery
  3. A 14/16 inch string trimmer bump feed attachment
  1. 40V EXPAND-IT power head
  2. Straight shaft EXPAND-IT trimmer attachment
  3. High capacity battery
  4. (1)40V lithium ion charger
  5. 0.08 inch twisted replacement line
    1. Black&Decker Cordless String Trimmer
    2. (1) Lithium Ion battery
    3. Charger
    4. 3 pack-bundle replacement spool
    Weight 9 lbs 13.9 lbs 15 lbs 7.8 lbs
    Shaft 49 inches Straight Straight Straight 38.5 inches - 53 inches
    Line Size 0.095 inches 0.08 inches to 0.095 inches 0.080 inches 0.08 inches 0.080 inches
    Line Feed Bump to feed Bump to feed Bump to feed Bump to feed Automatic feed
    Battery System Li-Ion 56V/2000mAh Li-Ion 40V/6000Ah 12V 2000mAh Li-ion 40V/2600mAh 40V 2000mAh Li-ion
    Warranty 5 Years Limited Warranty and 3 years on Battery 3 Year Limited Warranty and 1 Year Free Service 10 Year Warranty on Brushless Motor, 4 Year Warranty on tool and 2 Years Warranty on Battery 5 Years Limited Warranty 3 Years Warranty
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    Detailed 56V Ego String Trimmer Review

    Ego Battery Trimmer Build Profile

    The Ego battery weed eater is designed to punish even the most stubborn grass and weeds. It incorporates a high-efficiency brushless motor that is powered by a 56V Lithium-Ion battery to deliver the power of gas. Its head is sturdy with a spool that accepts a 0.095 inches dual twist line. The weed wacker is operated by a variable speed trigger that gives you total control. This allows you to apply torque as demanded by various types of vegetation subsequently extending battery life. The 49-inch long aluminum straight shaft makes the Ego cordless weed eater tough, far-reaching, yet less fatiguing. It also plays a big role in the overall balance of the weedeater. Lastly, there is a handle with foam covering that attaches to the shaft. This handle makes the Ego string mower comfortable to use and also dampens vibration from radiating right into your hand.

    Ego 56V String Trimmer Operation

    Operating the Ego 56V brushless string trimmer is very easy. You only need to press down the safety lever and pull up the variable trigger to start whipping weeds. However, you will notice a 1 second delay before the trimmer starts to run. Although it is good practice to put on safety gear when operating a weed eater, the ego line trimmer is designed with your safety in mind. It has a tough guard to protect you from flying debris. The head, on the other hand, spins clockwise to avoid slinging debris in an awkward direction. However, some people may like the direction of spin but it can be reversed by interchanging the wiring to the motor. The variable trigger also lets you apply a proportionate amount of torque when trimming.

    The telescoping handle on the trimmer helps you get a good balance, therefore indirectly making up for the lack of a neck strap. To match the efficiency and the power of its brushless motor, the Ego cordless weed whipper offers a 15-inch cutting width so that you complete the yard work in minutes. The bump feed mechanism on the head, on the other hand, lets you advance more string easily without stopping. At the same time, the string cutter blade on the guard keeps the string at a standard length while you cut. This helps to keep the trimmer in optimal operation at all times.

    Ego Weed Trimmer Battery

    The 56V lithium battery on the ego electric weed eater provides enough power to keep the unit in operation for up to to 40 minutes non-stop. All this time, the battery gives constant power to maintain optimal performance. As far as charging is concerned, the tool ships with a quick charger. This Ego charger is able to charge the 56V battery from completely dead to full charge in just 25 minutes. This incredibly short charging time keeps the downtime between recharging battery very short. The quick charge is uniquely designed with a fan that prevents it from overheating. Furthermore, you do not have to struggle with removing and installing the ego battery on the tool or charger. You just slide it in and out very easily and intuitively. To top it off, both the charger and battery are covered by a 5 and 3 year warranty respectively.

    Verdict: The Ego PowerPlus Cordless Weed Eater offers great power, the bump feed system works great, its battery integrates well with other EGO tools, and the warranty coverage is unmatched. It is a So, if you are a gardener, landscaper, or homeowner looking to untether yourself in the yard or to save the environment from exhaust gases while you trim, this Ego Power Plus cordless weed wacker is a great replacement. It is also a great addition to your EGO tool lineup. However, this heavy duty battery powered weed eater two major downsides; 1) you need a hex key allen wrench to split the shaft for easy storage and transportation, and 2) the ego has a non-attachment-capable design. It also does not perform as perfect when used as an edger.

    EGO 56v Trimmer Review Video

    DCST990 DeWalt Cordless Weed Eater

    The DCST990H1 Max XR Dewalt cordless weed eater is one of the landscaping tools produced by Dewalt. It is a fairly powerful string trimmer that delivers the power of an average gas trimmer thereby saving you from cords and and toxic exhaust gases. It is powered by a 40V lithium-ion battery that has an unmatched ampere rating of 6Ah so that you can mow and edge more before the next recharge. Like the other weed wackers reviewed thus far, the DeWalt Max XR too is equipped with an efficient and powerful brushless motor. The motor delivers a maximum speed of 6600RPMs and a lot of torque with high battery efficiency especially when operated at low speed.

    Advancing the string on this unit is pretty easy because the head utilizes the bump feed mechanism. So, you only need to bump the head on the ground while mowing grass to dispense more string. Its large cutting swath of about 15 inches together with the thick string size allows you to easily trim heavy thick brush. In addition, the two speed settings (high and low) combined with the variable speed trigger give you more control over the power of the tool. This lets you take down weeds with more precision.

    The Dewalt battery weed eater has a couple of features that make it comfortable for use. First, it has a rubberized handle that gives you a comfortable grip. Second, the handle can move along the straight shaft so that you can get a good balance when working. Third, the shaft is long enough to allow you to whack the weeds without bending. Lastly, the unit is well balanced with most of the weight at the back. Together, these features make Dewalt weed wacker a backyard ninja. The downside as far as ergonomics is concerned is that the tool lacks a neck strap to help distribute weight so that you can work longer without feeling fatigued. Nonetheless, the tool is generally well designed for commercial-grade performance

    Verdict: Although a little pricey, the Dewalt40V trimmer is a big toy for adults that can be used to knock down both lush grass and serious overgrown weeds in the yard. It is also a good maintenance-free landscaping machine that delivers the power of an average gas trimmer without waking your neighbors or polluting the environment. Moreover, it is a great addition to your DeWalt tool lineup especially if you already have a DeWalt chainsaw, blower, or backpack blower which share the DeWalt 40v battery. Unfortunately, this Dewalt weed eater is not attachment capable and the shaft cannot be bent.

    Greenworks Cordless String Trimmer

    The cordless Greenworks string trimmer is another powerful battery weed wacker. It delivers the power of a gas trimmer without the hassle of having to worry about maintenance or mixing oil and gas. It is similar to the Ryobi Expand-It model and in fact, accepts the Ryobi gas attachments. The Greenworks weed eater is equipped with a brushless motor that delivers a large amount of torque and quieter operations. The motor is also efficient on the battery to allow you to get more yard work done before depletion. In addition, the size of the cutting swath is reasonably wide to allow you to clear a larger area at one go.

    As far as design is concerned, the Greenworks cordless weed eater is ergonomically designed for easy work working and transportation. It is also versatile and can transform into various other tools such as a blower, hedger, edger, or pole saw. The spool is also easy to load in order to ensure that you spend more time working.

    Verdict: Generally, the Greenworks string trimmer is a powerful versatile cordless weed eater that is compatible with other attachments. If you are landscaping professional looking for a replacement for your commercial gas or electric trimmer, this unit might not quite level up particularly because of the life of its battery. It is good for residential use.

    RYOBI Attachment-Capable Cordless Weed Eater

    The Ryobi battery powered weed eater powered by a 40V Lithium Ion Battery and runs off of an efficient brushless motor. However, unlike the Ego whose motor is located on the head, the motor on the Ryobi weed whipper is located next to the battery. This gives the tool a better balance. The head features a bump feed system that allows you to increase the length of the 0.08-inch dual twisted line by simply bumping it slightly on the ground. The weed wacker also features a rubber handle that can be adjusted for good working ergonomics.

    Although the guard seems a bit smaller, it keeps grass and debris from flying to you quite effectively. The only awkward thing is that the Ryobi cordless weed eater rotates counterclockwise unlike other trimmers, thus throwing the clippings to the pavement. Therefore, when weed eating with this trimmer, you need to walk a reverse path so that debris can be thrown back to the yard. Otherwise, you can use a leaf blower to clean up the pavement afterward. The adjustable cutting swath (at 12 – 15 inches) on the Ryobi allows you to adjust the cutting width so that you can trim faster.

    Verdict: Bottom line, if you are looking for a cordless string trimmer that can transform to an edger, leaf blower, hedger, or pole saw, the RYOBI 40-Volt X Expand-it Cordless Attachment Capable weed eater a perfect tool. It delivers enough torque to cut weeds and trim grass in a typical suburban yard. Unfortunately, its power is not good enough to replace the gas-powered string trimmer especially if your yard is too large and covered with thick brush. Nevertheless, albeit the tool does not provide as much power, it is undeniably a very versatile cordless weed wacker for light and mid-duty applications.

    Black and Decker Cordless Weed Eater (LST136W 40V max)

    The LST136W 40V Max Black & Decker cordless weed eater is one of the lightest yet powerful landscaping tools a landscaper, homeowner, or gardener can own. It weighs less than 8 pounds and delivers power that is comparable to that of a gas trimmer. The cordless trimmer is equipped with a brushless motor that delivers an amazing amount of torque at a maximum speed of 7200 RPM. Although it only has one speed setting, it features a variable speed trigger that gives you more control over power.

    In addition to its lightweight construction, the 40V cordless black and decker weed eater has extra features that make it flexible, versatile, comfortable, and easy to use. These features include the adjustable pole height, adjustable auxiliary handle, automatic feed system, a metal guide bar for edging, and a head that can be rotated 180 degrees. The adjustable shaft (between 38 inches – 53 inches) accommodates your height while the telescoping handle allows you to move it to the most comfortable position. On the other hand, the metal guide together with the rotatable head allows you to easily convert the trimmer to a cordless edger. The automatic feed mechanism, that takes in 0.08″ string, lets the weedeater maintain a cutting swath of 13″ without your intervention. Together, these features make the black and decker cordless string trimmer arguably the most versatile landscaping tool.

    Verdict: Although the black and decker cordless weed eater does not have enough power to eliminate heavy thick brush, it does work well on lawn grass and moderate weeds. It easily converts from trimmer to edger and its metal guide lets you edge around patios and pavements in a straight line. The only drawback is that you might use more spools of string because of a lack of direct control on how the string is advanced during operation.

    Kobalt 80-Volt Max Cordless String Trimmer (Bonus tool)

    The Kobalt Cordless Weed Eater Max is a bonus tool in this review. It piqued our interest because of the sheer amount of power it delivers and its versatility. Kobalt 80v weed eater is powered by an 80V 2Ah Lithium-Ion battery that only takes 20-30 minutes to charge from dead to full charge. The trimmer is driven by an efficient brushless motor that is located next to the battery. This gives it a very nice balance despite being quite heavy. Similar to the Ego and Ryobi, the Kobalt 80V Max also uses a dual twisted line that provides at least a 15 inches cutting swath. However, the size of the string the Kobalt accepts is 0.015 inches less than that of the EGO string trimmer.

    The head of kobalt weed eater max has the tap-to-feed mechanism. This mechanism makes it very easy to advance the string while the trimmer runs. Its high and low-speed button located next to the handle lets you choose how fast the head spins while the variable trigger helps to regulate the amount of power to the head. Furthermore, the tool has an attachment-capable design that lets you transform it to different tools just like the Ryobi Expand-it model.

    The Kobalt battery powered weed eater max is ergonomically designed. Its brushless motor located on the tail helps get a good balance to avoid overstraining and fatiguing your arm. The handle is also adjustable so that you can move it a few inches on the shaft to your most comfortable position. In addition, the weed whipper also incorporates an intuitively designed variable trigger that gives you easier control over the power of the unit. The Kobalt cordless weed wacker is also designed with safety in mind. It has a large and fairly rugged shield to protect you from flying objects. However, this canopying guard is not a substitute for donning the protective gear.

    Verdict: If you are looking for a more powerful version of the Kobalt cordless weed wacker that accepts the universal gas attachments, the Kobalt 80 Volt Max 16-in Straight Cordless String Trimmer is a great choice. It can transform into a variety of different tools and delivers an amazing amount of power. Its high capacity battery also takes less time to charge fully and lasts long enough before the next recharge. This ensures that you are getting more work done in the least time possible. Unfortunately, this grass trimmer is fairly heavy and may fatigue your arm if used for long periods. The advantage is that the tool has an attachment hook to which you can attach an add-on neck strap. A neck strap allows you to hang the tool on your neck so that you can distribute its weight on your body.

    How to use a Cordless Weed Wacker

    Keeping the grass on your lawn short and neat depends as much on the quality of your string trimmer as on your skill to operate the tool. To help you use your weed wacker effectively to achieve the best results, follow these guidelines:

    1. Wear protective gear

      Safety comes first when operating tools. To keep yourself safe when operating a weed eater, wear at least these four protective equipment.
      Eye Protection
      Eye protection equipment such as a pair of protective goggles shields your eyes from flying debris.
      Ear protection
      Hearing protection equipment protect your eardrums from being damaged by the sound the string trimmer produces during operation.
      Closed-toe shoes
      Shoes that completely cover your toes protect you from stones and material being pelted around while the head spins.
      A good pair of safety gloves
      Safety gloves protect your hands from developing blisters and from being hurt in case of an accident.

    2. Insert Battery

      Grab the battery off the charger and click it into place. Ensure that the battery is fully charged to get a decent amount of runtime before the next recharge.

    3. Check the size of the string

      If the string is too short, advance it to the right length using the string dispense mechanism of your weed eater model. If your tool does not have enough cutting string, feed a new spool. Consult your tool’s manual on how to do it or skate right on to these three easy ways to replace a weed eater trimmer line.

    4. Start trimming

      Press the start button to turn on the weed eater.

    5. Set speed

      If the weed wacker has more than one speed setting, select the appropriate speed. Normally, the type of weed or grass you are cutting determines the speed to set on your tool. If you are dealing with overgrown grass and hardy weeds, the highest speed setting is appropriate. Otherwise, an average speed setting will suffice.

    6. Start trimming

      Pull the trigger to increase torque and release it to stop the motor from running. Be sure to move the weed wacker in a side to side motion for best results.

    7. Bump the head

      If the line stops cutting, bump the head slightly onto the ground to dispense more string. However, this only applies to string timmers with the bump to feed mechanism. If the string is depleted, restring the spool.

    8. Clean the trimmer

      Once done trimming, remove the battery and wash the head of the string trimmer with water and then blow the motor with a blower to remove debris. For weedeaters with the motor in the head, be careful not to soak in water.

    9. Store

      Store the unit safely in the tool storage room or workshop.


    Julius is an electrical engineer working as an O&M supervisor at a solar microgrid company. He heads a team tasked with maintaining operations of microgrid power plants. In his career, Julius has learned that getting the right tools for the trade is key to getting the job done right. That is why he likes to talk about tools.