Black & Decker LCC420 Review

product image of Black & Decker LCC420 String Trimmer and Sweeper Lithium Ion Combo Kit

Our rating: 4.5 stars Very good  

Customer rating: 700+ reviews

Price: $176.95*        Buy from

* including battery and charger

The LCC420 is a combo kit which features the Black & Decker LST400 string trimmer and also the LSW20 blower. Lightweight, easy to handle and with solid battery time, it is a great choice for any small or medium lawn that doesn’t require heavier trimming.

  • Lightweight, easy to use
  • Solid battery run time
  • Two speeds
  • Not for heavier trimming
Key specifications:
  • Edger: yes
  • Weight: 6.3 lbs
  • Battery time (according to users): 35-40 minutes
  • (more specifications)

Black & Decker 20V MAX Li-ion Straight Shaft String Trimmer & Edger – LST400


trimming grass near fence using the LST400The LST400 shares all the advantages of cordless weed whackers – complete freedom of movement, no dragging power cord around (and winding it up after trimming) or switching outlets. Also no maintenance, fuel mixing or vibrations typical for gas trimmers.

It is lightweight and easy to use, women will love it as well! Also very easy to assemble – afterwards it starts just with a push of the button and operates without any noise.

Power and line feeding

This unit is designed for trimming light to moderate grass and weeds in hard-to-reach places, around fence lines or trees – and it has plenty of power for that. But don’t expect to be able to clear some tall heavy weeds and blackberry bushes easily.

A nice feature is the dual mode switch – you can choose from two different speeds depending on how much power you need, which is quite useful for preserving the battery life. It uses autofeed to advance the line, so no bumping is required – and most users report the mechanism works fine.

Power switch


The supplied 4.0ah 20V battery offers very nice run time of 35-40 minutes which should be pretty enough for a regular garden. Only the recharge takes quite a lot of time, users report between 6-8 hours – so if you have a larger yard, it is advisable to buy a spare battery or the faster charger.

The Black & Decker LCC420 combo is also part of their 20V lineup – so if you have some tools from this collection, you probably already have a spare battery. This lineup is also quite extensive and includes many useful tools like drills, pole saw, hedge trimmer or others.

Edger function

Edger and adjustments

Like most cordless weed whackers, this one can be also converted to an edger simply by pushing a button and rotating the head. Users report they are really satisfied with this function, the edge is pretty straight and clean.

Also a little guide wheel is present – although it’s not much better than the classical metal wire guide, it certainly helps when trimming near fence/flowers or edging. Plus you can also adjust the shaft length to better match your height.


The included Black & Decker LSW20 sweeper is a nice bonus – lightweight, comfortable and ideal for clearing debris from decks, sidewalks, garages or other hard surfaces. Again, don’t expect some great power, it has problems with blowing leaves from grass or with any wet stuff – but for cleaning your walkways after edging or similar jobs it’s perfect.

Conclusion:  If you want quality and lightweight string trimmer mainly for light and medium duties, Black & Decker LCC420 is the right choice for you. Very easy to use, with good battery time and you’ll also get a sweeper as a bonus.

Or if you need a bit more power, check out also the 40V LST136W.

>> Read more or buy the Black & Decker LCC420 here

changing the battery      blowing debris out of your garage using the LSW20 sweeper


  • Battery time (according to users): 35-40 minutes
  • Battery power indicator: no
  • Weight: 6.3 lbs
  • Cutting swath: 12″
  • Line: 0.065 single string
  • Feeding: autofeed
  • Warranty: 2-year limited
  • Includes: LST400 String Trimmer, LSW20 Sweeper, 1 4.0ah battery, charger, 1 spool

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Frequently asked questions:

How to assemble it?
   Show Video
How to change the line spool?
   Show Video
How should I treat the battery to ensure maximum lifetime?

Always store the batteries inside your house in reasonable temperatures – never leave them on direct sun or outdoors during winter! Also recharge the battery as soon as it is out of power.

What is included in the package?

The LST400 weed eater itself, the LSW20 Sweeper, one 4.0ah battery, charger and 1 spool.

Are there any accessories I should buy?

We recommend getting the 3 spool replacement package and if you have a larger yard, consider buying a spare battery (or the fast charger).

Is there any maintenance needed?

No, the motor is an enclosed unit so no maintenance is required. Just ensure a proper care to the battery (see above) and clean the machine from dead grass occasionally.


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