The BLACK+DECKER LST136 40V trimmer runs on a 40V MAX Lithium Ion battery, giving it some good power for tackling heavy grass and weeds in your yard. A cool feature of this trimmer is the Automatic Feed Spool (AFS) system, which is supposed to keep the line feeding smoothly as you work — no need to stop and adjust manually or bump the head for more line.
That said, according to our research, the AFS system has received mixed reviews. Some folks say it works perfectly, making trimming a breeze without interruptions, adding a nice level of convenience. But others have run into issues with the autofeed not kicking in as expected, meaning they had to handle it manually to keep going smoothly.
The mixed experiences with the AFS could be due to how the trimmer is used, the environment, or just differences in manufacturing here and there. While the convenience of the system is great when it works, it's smart to be ready for some hands-on fixes if needed.
If the autofeed feature has you worried, you might want to check out some troubleshooting tips on manual line feeding. It's also wise to keep an extra spool of line around and think about getting a spare battery if you want to keep going without any interruptions.
Overall, the BLACK+DECKER LST136 40V trimmer is notable for its power and battery life. The 40V battery is generally strong enough for common gardening tasks and offers decent runtime. If you're often dealing with larger or tougher areas, having an extra battery, as some folks suggest, could keep you trimming longer without needing an outlet.
Despite some quirks, the LST136's power and ease of use make it a solid pick for a lot of homeowners looking to tidy up their lawns.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 18 retailers in ShopSavvy's price data, most recently seen Jun 24, 2026.
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
| $129.00 | Jun 24, 2026 may have changed | ||
| $129.00 | Oct 22, 2024 may have changed | ||
| $137.08 | Oct 22, 2024 may have changed | ||
| $146.90 | Oct 22, 2024 may have changed | ||
| $149.00 | Oct 22, 2024 may have changed |
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