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BLACK+DECKER LST420 20V MAX Lithium High Performance Trimmer and Edger, 12"

4.4 4.4 out of 5 stars 1,907 ratings

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Brand BLACK+DECKER
Power Source Battery Powered
Color Black
Item Weight 8.2 Pounds
Cutting Width 12 Inches

About this item

  • The PowerDrive Transmission delivers more power from the motor to the cutting string so you can get the job done faster
  • Runtime Extension Technology with dual mode accelerator switch for high performance or longer run time
  • The Automatic Feed Spool ensures continuous work without bumping
  • Includes (2) 2.0-Amp-hour lithium battery packs- each battery pack delivers 33% more capacity than the LBXR20 battery pack
  • Part of the 20V MAX System - A System that Demands Attention. 1 Battery fits multiple tools
See more product details

Customer ratings by feature

Maneuverability
4.5 4.5
Light weight
4.5 4.5
Battery life
4.0 4.0

From the manufacturer


What's in the Box
  • LST420 trimmer/edger
  • (2) LBXR2020-OPE 20-volt MAX lithium-ion batteries
  • Charger
  • (1) AF-100 30-foot spool
  • Guard
  • Handle
  • Operating Instructions

BLACK+DECKER 20-volt Max Lithium High Performance Trimmer and Edger

LST420

Delivering long battery life and power to tackle trimming and edging tasks, the BLACK+DECKER LST420 High Performance Trimmer and Edger offers the freedom of cordless convenience and extended runtime. The LST420 features a new dual-mode switch, giving you the option to choose between high power or extended run time. You'll get up to one hour of runtime1 for trimming large yards without the hassles of gas-powered trimmer/edgers.

Ideal for trimming areas of overgrowth after mowing and edging along borders, sidewalks and flower beds, the LST420 is quiet and easy to start. The adjustable height and pivoting handle positions provide maximum comfort and control.

At a Glance

  • Runtime Extension Technology with dual mode accelerator switch for high performance or longer runtime
  • 20-volt MAX lithium-ion battery system provides longer battery, life year after year; includes two batteries
  • PowerDrive Transmission delivers more power from the motor to the cutting string
  • Automatic Feed Spool ensures continuous work without bumping
  • Wheeled edging feature — just rotate to convert from trimmer to edger

Runtime Extension Technology

BLACK+DECKER's Extended Runtime Technology features electronics that allow this trimmer/edger to maintain constant speed in a variety of grass conditions so the it runs at an efficient speed for extended battery life. In high-power mode, the LST420 ramps up the power output to quickly take down heavy grass and weeds. In runtime mode, the trimmer/edger provides up to one hour of runtime for normal trimming.

The LST420 comes with two 2.0 amp-hour lithium-ion batteries (model LBXR2020), which offers 33 percent more runtime per battery pack than the previous LBXR20 pack.

Trim in Comfort

Easy to start and quiet to operate, the LST420 cordless trimmer/edger weighs 5.7 pounds. Plus, it's fully adjustable so you can work at the ideal height, with pivoting handle positions to trim at odd angles in comfort and a telescoping pole that easily adjusts to a your preferred length.

This cordless trimmer/edger also features BLACK+DECKER's PowerDrive Transmission, which delivers consistent power in most grass types, helping to maintain cutting performance while trimming and edging in heavy grass or weeds. That ultra-efficient performance plus a generous 12-inch cutting swath help every job go faster.

Smooth Operation

With the LST420, you never have to bump to release the string or waste time continually adjusting the string spool. The BLACK+DECKER Automatic Feed Spool keeps the string at the optimal length automatically and continuously. The LST420 also converts from trimmer to an edger in seconds. A wheeled edge guide has been added for balance, helping to eliminate the need to hover the trimmer/edger over the line of grass between the lawn and sidewalk while edging. Simply roll along the sidewalk or driveway, and the wheel supports the weight of the trimmer/edger for a fine edge and straight, clean edges.

Cordless Freedom

BLACK+DECKER's 20-volt MAX lithium-ion batteries offer a longer lifespan and retains its charge 5x longer than similar 18-volt NiCad batteries. They're compatible with the full line of BLACK+DECKER's 20-volt MAX line of power and gardening tools, and you won't be limited by an extension cord.

Easy to use and maneuver, the battery-powered timmer and edger eliminates the need for gas or oil to be stored.

About BLACK+DECKER

Since 1910, BLACK+DECKER has been setting the standard for innovation and design of power tools, accessories, outdoor yard care equipment, home cleaning products, automotive and lighting products, hardware, and other home improvement products. The inventor of the first portable electric drill with pistol grip and trigger switch, BLACK+DECKER has evolved from a small machine shop in Baltimore, Maryland, to a global manufacturing and marketing powerhouse with a broad line of quality products used in and around the home and for commercial applications. When users need to get work done, they trust BLACK+DECKER for the products that will do the job efficiently and reliably.

Looking for specific info?

Product Description

With a dual-mode switch for extra power or extra runtime, this battery-powered trimmer and edger features POWERDRIVE transmission to tackle tough overgrowth. Easily converts from trimmer to edger. Included Components: LST420 20V MAX* Cordless Trimmer/Edger, (2) LBXR2020-OPE 20V MAX* Batteries, (1) Charger, (1) AF-100 Spool, (1) Guard, (1) Handle; Power Source: Lithium Ion

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here [PDF ]

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BLACK+DECKER LST420 20V MAX Lithium High Performance Trimmer and Edger, 12"


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BLACK+DECKER LST420 20V MAX Lithium High Performance Trimmer and Edger, 12"
BLACK+DECKER LST420 20V MAX Lithium High Performance Trimmer and Edger, 12"
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PriceCurrently unavailable.$89.99$6.35-23% $76.88
List:$99.99
-17% $99.00
List:$119.00
-9% $117.99
List:$129.00
Delivery
Get it as soon as Wednesday, Apr 3
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Light weight
4.5
4.4
4.8
4.6
4.5
4.6
Maneuverability
4.5
4.1
4.6
4.5
4.4
Battery life
4.0
3.9
3.9
3.9
3.6
Easy to use
4.1
5.0
4.7
Sold By
MAXLANDER
Amazon.com
Amazon.com
Amazon.com
Amazon.com
power source
Battery Powered
Battery Powered
Battery Powered
Battery Powered
Battery Powered
cutting width
12 inches
12 inches
3.5 inches
12 inches
12 inches
1000 inches
assembly required
weight
8.2 pounds
0.05 pounds
5.7 pounds
5.3 pounds
10.5 pounds

Customer reviews

4.4 out of 5 stars
4.4 out of 5
1,907 global ratings

Customers say

Customers like the battery life, performance, quality, weight and ease of assembly of the string trimmer. For example, they mention that it works well, it's easy to put together and that the batteries last a long time.

AI-generated from the text of customer reviews

628 customers mention486 positive142 negative

Customers like the battery life of the string trimmer. They say the batteries are good for about 20 minutes of continuous use at high speed setting, and can be charged up fast. Some customers also mention that the batteries can be replaced.

"...Lithium is just too damned convenient, powerful, and easy to use...." Read more

"...The batteries are good for about 20 min. of continuous use at High speed setting...." Read more

"...Battery lasted forever, almost 40mins. And it comes with two batteries. So you never have to worry about running out of power.-..." Read more

"...Since it comes with 2 batteries I am able to run the trimmer on high speed the whole time...." Read more

595 customers mention546 positive49 negative

Customers are satisfied with the performance of the string trimmer. They mention that it is easy to use, gets the job done much better than their previous gas trimmers, and has longer battery life. The trimmer works well for grass but not as well with tall weeds, and the end result is great. The auto feed works as promised, and it is a quiet tool. The edging wheel is excellent and works even when cutting upright.

"...If you want a cordless trimmer that's lightweight and gets the job done, this is a good one to consider." Read more

"...The edger function is excellent also, but as stated before; you will need to have a well established line between your grass and you driveway/..." Read more

"...I love the edging wheel as it works even when cutting upright, to easily cut grass right up to the sides of your foundation without wearing the..." Read more

"...The Low setting, which gives longer battery life, works just fine for grass but not as well with tall weeds, so I usually keep it on High...." Read more

579 customers mention474 positive105 negative

Customers like the quality of the string trimmer. They say it does a good job of cutting and edge well. They also say it easily cuts through high and heavy areas, and does n nice job of removing weed heads. Customers also mention that the trimmer wheel is excellent and the new model has a bigger cutting path.

"...Trimmer Replacement Spool, 3 Count (2 Pack)]] The B+D brand is good quality and I'm happy with it...." Read more

"...The trimmer was cutting through the grass pretty good for the first 10 minutes, after that I noticed the power was starting to drain from the..." Read more

"...I love the edging wheel as it works even when cutting upright, to easily cut grass right up to the sides of your foundation without wearing the..." Read more

"...So far no durability issues. Seems well-made...." Read more

479 customers mention462 positive17 negative

Customers find the weight of the string trimmer to be rather light. They say the decreased weight and ease of use are well worth having less power. Customers also mention that the trimmer is easy to hold and edge in a straight line.

"...just perfect for me because even with the battery installed, it's lightweight and well balanced and easy for me to use...." Read more

"...And on the plus side it's lighter, easier to hold, you won't burn your elbow on a hot motor, it's quieter, and you won't numb your hands from..." Read more

"...The new B&D unit is better in every way! Lighter, quieter, does a better job, and of course no cord to worry about...." Read more

"...Easy to maneuver.- No more strapping, since it's so super light.- Battery lasted forever, almost 40mins. And it comes with two batteries...." Read more

369 customers mention364 positive5 negative

Customers find the string trimmer easy to assemble. They say it only takes 5-10 minutes to put together and is easy to use for most anyone. They mention that the auto feed works great and that the trimmer to edger position is easy one-handed. Customers say it's excellent for no hassle yard use and makes their job so much easier.

"...'ll need a Philips head screw driver to secure the guard but it's quick and easy - less than 10 minutes...." Read more

"...It is excellent for no hassle yard use. No cords, no gas, no oil, no trimmer lines, no fumes...." Read more

"...Lithium is just too damned convenient, powerful, and easy to use...." Read more

"...The B&D, on the other hand, is much easier to handle, and cuts better and faster without spraying bits of plants all over me...." Read more

247 customers mention177 positive70 negative

Customers like the power of the string trimmer. They say it is light weight, has enough power for the job, and has decent power for basic trimming. Some say that it has enough weed wacking power to clean up the alley. They also mention that it works as a counterweight and that it is battery powered, not gas.

"...This trimmer is really powerful! I had no issues with any of the vegetation in my yard...." Read more

"...I'll tell you why: This is a battery powered trimmer, not gas. It is excellent for no hassle yard use...." Read more

"...I start getting a little irritated that the trimmer isn't working as well as I think it should and a minute or two later, the power stops, at which..." Read more

"...Lithium is just too damned convenient, powerful, and easy to use...." Read more

119 customers mention66 positive53 negative

Customers are mixed about the charging of the string trimmer. Some mention that it charges up pretty fast, while others say that it takes a long time to charge. They say that the battery does get used fairly quickly and that it does drain the battery faster.

"...This made for fast, even cuts along the base of my house and flower bed, and in the backyard along the fence...." Read more

"...the battery that came with this trimmer failed to charge almost 2 yrs after i bought. No complaints really - i mean almost 2 years, right?..." Read more

"...They charge up pretty fast (less than an hour, I think), so if you manage to go through both of them you can take a beer or coffee break and be back..." Read more

"...You will not be able to recharge one battery as you are using the other....it won't charge enough...." Read more

94 customers mention45 positive49 negative

Customers are mixed about the auto feed of the string trimmer. Some mention that it's wonderful, and the spool line is excellent. However, others say that the auto-feed doesn't always work when edging.

"...I do wish the trimmer was more powerful and the line feed was a little more frequent...." Read more

"...The line is advanced automatically so no more bumping the trimmer to feed more line...." Read more

"...1. Sometimes the line doesn't feed as often as I need it to, and it gets a bit short...." Read more

"...The automatically feeding spool is excellent and I have not ever had to change the spool line...." Read more

Powerful and convenient, but have  two extra batteries on hand(4 total) for whole yard.
5 Stars
Powerful and convenient, but have two extra batteries on hand(4 total) for whole yard.
I bought this for a small yard in Florida. This Weedwhacker is the primary/only tool grass cutter, edger, and trimmer I used for my yard. My small driveway lawn not shown in pic. I use this specific tool to cut the entire lawn. The grass was 6 inches high, full bloom, and thick green after 35 days. My yard is new and I have minimal storage. I needed something light weight and easily stored. The L420 series had the best reviews on Amazon And looked like it would work for my size of the yard. Note I also bought the mower mount adapter (separate for L420) and used it in conjunction with this Weedwhacker.1. Super lightweight and convenient.2. Powerful! Recommend protective glasseswhen using the wheel for edging (vertical debris). Cut 6 inches down to two no problem. Mover mount was less effective as direct wheedwhacking, but still worked as long as you pushed back and forth a couple times. I think mount would work better it wasn’t 35 days of growth.3. Stores easily; hang on a nail in shed.4. Clean; no fuel or oils. Charge and go.Cons:1. Battery life: 15-20 minutes on high power for thick 6 inch grass.2. Battery charge takes 3 hours per battery. Overall this thing works great. However I ordered two more batteries at about $25-$29 per. It probably only takes 2 1/2 to 3 batteries for my yard but four batts will guarantee the job as well as plenty of time to trim and edge neatly. It’s really inconvenient if both batteries die and the project is not complete- no one wants to wait six hours after sweating in Florida summer heat and get dirty again just because of a battery charge waiting period. SO. Spend the cash to get two more batteries, or by a power cord tool to finish what’s left.I thought using this was so quick and easy that it made cutting my lawn very fun! The thing is easy enough you can cut the whole lawn in flip flops or without eye protection and still be relatively clean from splatter- though I don’t recommend it. I find myself always checking the yard to see what needs to be cut or if I missed a spot so I can grab the WW and go to town. I dunno. Therapeutic?? Just buy a couple more batteries. ;) enjoy!
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