BLACK+DECKER LST140C 40V MAX Lithium String Trimmer Review

BLACK+DECKER LST140C 40V MAX is a cordless battery powered string trimmer. It’s successor to BLACK+DECKER LST136 string trimmer.

BLACK+DECKER LST140C has cutting swath of 13 inches, uses 0.065” line and does 6,500 RPM at no load. It’s pretty powerful for its price – not as powerful as gas powered string trimmers but it does cut most of the stuff.

It’s not made for heavy duty jobs but it’s powerful enough for low and medium duty ones.

BLACK+DECKER LST140C 40V MAX Lithium string trimmer has AFS® (Automatic Feed Spool) system that works great!


BLACK+DECKER LST140C can be turned into edger in seconds by flipping metal bracket guide – it’s not as comfortable to use as having support wheel like most other string trimmer that can be turned into edgers.

Overall it doesn’t work well as an edger so many will find this feature useless.


BLACK+DECKER LST140C 40V MAX Lithium string trimmer is well balanced and relatively light. Front handle is adjustable and so is the shaft, however even at its longest setting it’s still a bit short – too short if you are above average height.

If you are of average height or shorter you will probably with LST140C comfortable to use, but if you are above it then it’s not great in terms of comfort. It’s not super terrible (unless you are really tall) but there are weed wackers out there that tall people will find much more comfortable.

Black and Decker LST140C weighs 6.5 lbs and measures 9.625 inches deep, 40.75 inches high and 4.625 inches wide.


BLACK+DECKER LST140C string trimmer uses 40V 1.5Ah Lithium Ion battery. Battery life depends on how you use it but generally it’s around 25-40 minutes (most consumers report 30-35 minutes).

Fully depleted battery takes 2 hours to 2 hours 50 minutes to charge.


Although LST140C is a successor to LST136 in my opinion it’s worse.

LST140C doesn’t have wheel that supports edging that LST136 has, instead LST140C uses metal bracket guide which doesn’t work anywhere near as good.

New model also has pressure sensitive trigger for controlling power output – it’s not a very comfortable solution and has short travel so it’s hard to use it precisely. LST136 has power dial that’s a much better solution. LST140C also feels slightly less powerful than LST136 at their maximum power settings – it might not be the case in reality but that’s the way it feels. If it’s the case perhaps maybe it was done to improve battery life.

Overall length is shorter too – so if your are above average height you will find the new model less comfortable to use.

─── Related Article: Best Electric String Trimmers ───


BLACK+DECKER LST140C 40V MAX is a decent string trimmer for its price, however it does disappoint in some areas. It lacks features that many other Black and Decker cordless string trimmers have and is not as good as the model it replaces.


If you have come across this review you are probably looking for a good string trimmer to purchase. So to help you make the right decision here is a list of best string trimmers we have reviewed so far:

BLACK+DECKER LST140C 40V MAX String Trimmer / Edger Specs:

  • Type: Electric (battery powered)
  • Battery type: 40V 1.5Ah Lithium Ion
  • No load speed: 6,500 RPM
  • Cutting path: 13”
  • Line diameter: 0.065”
  • Approximate dimensions: 9.625″ x 40.75″ x 4.625″ (D x H x W)
  • Weight: 6.4 lbs
  • Package contents:
    • 1 x LST140 40V MAX* Lithium String Trimmer/Edger
    • 1 x LBX1540 40V 1.5Ah Lithium Ion Battery
    • 1 x 40V MAX* Charger
    • 1 x AF-100 Spool
    • 1 x Guard
    • 1 x Auxiliary Handle

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