Model#: BDKNLST522

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Black & Decker LST522 20V MAX 2.5 Ah Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger Kit

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  • Black & Decker LST522 20V MAX 2.5 Ah Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger Kit
New $79.98
Recon $69.99
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Get the power you need with this Black & Decker 20V MAX 2.5 Ah Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger Kit with extended battery capacity. Power through tough overgrowth, or reduce speed while you edge for extra runtime. Either way, there's no bumping required thanks to the Automatic Feed Spool.
  • Automatic Feed Spool (AFS) feeds trimmer line as needed without bumping
  • Extended battery runtime provides 66% more battery capacity
  • 2-speed control lets you boost power or extend runtime
  • PowerDrive Transmission increases torque for more cutting power at the string
  • Easily converts from trimmer to wheeled edger
  • Adjustable height and handle with premium soft grip improves comfort and control
  • 20V MAX Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger - LST522
  • 20V MAX 2.5 Ah Extended Runtime Lithium-Ion Battery - LBXR2520
  • 20V MAX Lithium-Ion Battery Charger
  • AFS Spool
  • Guard
Compliance and Restrictions
warning: --


Series: 20V MAX
Cordless: Yes
Batteries Included: 1
Battery Amp Hours: 2.5 Ah
Battery Type: Li-Ion
Cutting Width: 12 in
Drive Shaft Type: Straight
Line Diameter: 0.065 in
No-Load Speed (RPM): 5,500 / 7,200
Speed Settings: 2
Voltage: 20V



4.4 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (8)
Easy To Use (8)
Lightweight (6)
Battery Longevity (if applicable) (5)
Powerful (4)
Not Durable (1)
Best Uses
Frequent Use (4)
Large Projects (2)
Small Projects (2)
Home Repair (1)
Yes, I would recommend this to a friend
Easy To Use
Battery Longevity (if applicable)
Best Uses
Frequent Use
A real bargain. I have found running unit on #1 setting gives you far greater battery reserve without giving up power of unit while operating.
This is second type trimmer/ edger he I have purchased . This unit is much more powerful then the original model. The extra 2.5 ah battery & line spools were a real plus. Very satisfied with purchase & would recommend this product to others.
May 8, 2019
3 weeks ago
Describe Yourself:
Avid Do-it-Yourselfer
Very Good Edger
Light and easy to use... I've had it now for almost two years... Does a great job edging up my lawn and driveway.... My only gripe is that I wish the chord would last longer... Secondly, this isn't really a gripe but just advice to any new purchasers: Speed 2 is mostly useless in my opinion. I've never needed much more power beyond Speed 1 to trim even the toughest grass/weed. Speed 2 drains the battery and burns through the chord too quickly. I NEVER use it. You'd be wise not too as well...
July 28, 2018
Originally posted at
Very Happy With Trimmer
After charging the battery over night I used my trimmer this morning. I have a 10,000 sf yard and used the product on the entire outline of the front yard and the back yard. I used the low speed (1 and was able to complete the entire job. I switched to high speed to see how much more I had left and it only lasted another 5 minutes or so. Overall, I would estimate (I did not time) that the low speed setting will provide around 45 minutes of operation. Also, love the front wheel for guiding edge work...made the job go smoothly and quickly. The auto trimming for the cord worked perfectly...a nice feature. Finally, the unit it light weight and well balanced. For the price this is a hard to beat trimmer for individual home use.
July 22, 2018
Originally posted at
Great product
I must say I was skeptical at first about a battery powered weed eater. I have a small yard but this was the perfect fit. This was the first time I used but as long as string continues to feed correctly and battery hold up I would give 4 stars.
July 8, 2018
Originally posted at
Big improvement! Thank you!
Light weight, easy to use. Helping my husband with weed eating for the first time ever. Thank you Black +Decker!
June 26, 2018
Originally posted at
Poor Battery life
I bought this trimmer 2- week ago first use Charged for approximately 24 hours
Trim time less then 10 minutes placed back on charger for 6-days run time 10 minutes Find out the extended run battery is about $70.00 run time new battery
15 minutes Do not Buy This Item,,, The first 5 minutes it runs great after that just drag out the cord
May 7, 2018
Originally posted at
Good lightweight trimmer
I use many Milwaukee Commercial 18V tools and the only issue I have with this B & D home grade model is that the batteries don't have a larger capacity, or in other words, they are not built larger with more charge storage capacity. Other than that I do like this new model string trimmer
August 23, 2016
Originally posted at
Top Of the Line
I upgraded my B&D 18v trimmer after years of hard work when the battery wore out. Coming back to B&D for a new one was a no brainer. The features on the 20v Lithium are well thought up. 2-speeds to conserve battery runtime thru the easy stuff & high power for the thick tough stuff, an adjustable wand with a comfortable grip and an easy push button to flip the head. I've been using this over a year and theirs nothing more I would ask for to make this better. Even the price was less than others I tried to compare. If you're on the fence, I say buy it, around the house you don't need anything bigger.
June 1, 2016
Originally posted at
Good purchase
This is a relatively light weight trimmer, so it's easy to handle and maneuver. The battery is small, light, and simple to detact (unlike the monster I had been using previously - another brand). The wheel guide is a nice touch for the edging feature. It keeps the edges even, and reduces the stress on my arms. I had hoped that the telescoping bar would make it long enough for me to use without having to stoop too much but it doesn't (at 6ft, most handles are too short for me). But if you are average-to-shorter, I suppose the adjustability will be a nice feature for you. It trims well, edges the sidewalk easily, does what it's supposed to do. If you're looking for a new edger, lose the power cord and get this one.
May 27, 2016
Originally posted at

Questions & Answers

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Browse 3 questions Browse 3 questions and 3 answers
Is the lst522 compatible with the mod 100 mower deck?
marvin g on Sep 13, 2018
BEST ANSWER: Your question will be best answered by the manufacturer, who can provide you with the accurate information. The number to reach the technician directly is 1-800-544-6986 or online at

New Vs. Reconditioned

What's the difference between New and Factory-Reconditioned?

Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
  • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
  • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
  • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
Condition: New Factory Reconditioned
Features: Same Same
Specs: Same Same
Includes: 20V MAX Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger - LST522,
20V MAX 2.5 Ah Extended Runtime Lithium-Ion Battery - LBXR2520,
20V MAX Lithium-Ion Battery Charger,
AFS Spool,
20V MAX Cordless Lithium-Ion 12 in. 2-Speed String Trimmer/Edger - LST522R,
20V MAX 2.5 Ah Extended Runtime Lithium-Ion Battery - LBXR2520,
20V MAX Lithium-Ion Battery Charger,
AFS Spool,
Availability: In Stock In Stock
Warranty: 2 Year Limited Manufacturer's limited 2-year warranty.
Price: $79.98 $69.99
You Save: N/A $9.99 (12%)


Warranty Information

Black & Decker Tools and Home Products

Warranted for two (2) years from date of purchase. This warranty does not cover damage resulting from negligent handling, misuse or lack of reasonable maintenance and care. (Proof of purchase maybe required).