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Greenworks 40V 17" String Trimmer, 8.0 Ah Kit

Ranked #1 of 14 in Best Cordless String Trimmers: Greenworks & Ryobi Compared (2026). Here is every spec we scored, where it came from, and how it compares.

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#1 · Top pick

Greenworks 40V 17" String Trimmer, 8.0 Ah Kit

Best for: Longest runtime here: 80 min on an 8 Ah battery

8.3/10

What we like

  • Top runtime in this comparison (80 min)
  • Top kit battery energy in this comparison (320 Wh)

Watch out for

    Score breakdown

    Cutting swath 25%
    Runtime 25%
    Kit battery energy 20%
    Listed weight 20%
    Brushless motor 10%
    Cutting swath17 in
    Runtime80 min
    Kit battery energy320 Wh
    Listed weight7.1 lb
    Brushless motorNo
    Kit battery40 V 8 Ah = 320 Wh (computed)
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    Specs source:

    Greenworks 40V 17" String Trimmer, 8.0 Ah Kit head-to-head

    Head-to-headGreenworks 40V 17" String Trimmer, 8.0 Ah Kit vs Ryobi 40V HP Brushless 17" String Trimmer KitHead-to-headGreenworks 40V 17" String Trimmer, 8.0 Ah Kit vs Greenworks 80V 16" Brushless String Trimmer Featured inBest Lightweight Cordless String Trimmers (2026)

    How it compares

    Open the full comparison table

    Ryobi 40V HP Brushless 17" String Trimmer Kit
    6.9/10
    #2 · Adjustable 15–17 in swath and a 6 Ah battery
    Greenworks 80V 16" Brushless String Trimmer
    6.8/10
    #3 · 65 min runtime from a 2 Ah 80V battery
    Greenworks 80V 16" Brushless Carbon Fiber String Trimmer
    6.7/10
    #4 · Carbon fiber shaft at 7.7 lb
    Greenworks 60V 17" Brushless String Trimmer
    6.6/10
    #5 · 17 in brushless at 7.3 lb
    Greenworks 24V 15" Brushless String Trimmer, 6.0 Ah Kit
    6.4/10
    #6 · Light 15 in brushless at 6.06 lb with 60 min runtime
    Greenworks 80V 17" Brushless String Trimmer
    5.8/10
    #7 · 17 in 80V brushless trimmer
    Greenworks 60V 16" Gen 2 Brushless String Trimmer
    5.1/10
    #8 · 60V brushless with 53 min runtime
    Greenworks 24V 13" Brushless String Trimmer/Edger
    4.8/10
    #9 · 13 in trimmer/edger at 5.51 lb
    Ryobi 18V ONE+ HP Brushless 15" String Trimmer Kit
    3.7/10
    #10 · 18V ONE+ brushless with a 13–15 in swath
    Ryobi 18V ONE+ 13" String Trimmer/Edger Kit
    3.5/10
    #11 · Budget 18V trimmer/edger, 55 min runtime
    Greenworks 40V 15" Gen 2 String Trimmer
    3.4/10
    #12 · 13/15 in swath on the 40V platform
    Greenworks 40V 12" String Trimmer
    2.0/10
    #13 · 12 in 40V trimmer with 33 min runtime
    Greenworks 24V 12" String Trimmer/Edger
    1.7/10
    #14 · Lightest-duty option for small yards