Greenworks 40V 20" Twin Blade Mower, 4.0Ah + 2.0Ah Battery

What It Is

This is a complete 40V cordless mower package from Greenworks, not a standalone blade. It includes the 20-inch twin-blade mower, one 4.0Ah battery, and one 2.0Ah battery. Designed for residential lawn care on small to medium yards (up to 1/3 acre).

Fitment & Compatibility

• Deck size: 20 inches – only fits mowers with a 20-inch cutting deck.
• Model: Greenworks 40V twin-blade mowers (e.g., MO40L210, MO40L410, MO40L416). Verify your model number on the mower’s sticker under the battery or on the frame.
• Batteries: Uses Greenworks 40V G-Max batteries. The 4.0Ah and 2.0Ah are included; any 40V Greenworks battery works as a replacement or spare.
• OEM vs aftermarket: This is OEM Greenworks. Aftermarket blades exist but check blade length (20") and center hole size (usually 1” or 7/8”) – measure your current blade.
• What to measure: Blade length (20"), center hole diameter, and thickness (typically 0.125”). Confirm bolt pattern matches your mower’s spindle.

Key Things to Know

• Battery run time: 4.0Ah lasts ~30-45 min on a typical lawn; 2.0Ah lasts ~15-20 min. Plan to swap batteries mid-mow for larger yards.
• Twin blades: Two overlapping blades create a mulching effect and better lift. Replacement blades must be bought as a set (both blades identical).
• Installation: Simple – remove the single bolt holding each blade, swap, and tighten to 30-40 ft-lbs. Use a block of wood to lock the blade.
• Common gotcha: The blade bolt is reverse-threaded on some models (lefty-tighty, righty-loosey). Check your manual before forcing.

Should You Buy It

Buy this if you have a Greenworks 40V 20-inch twin-blade mower and need a complete mower-plus-battery package for a new setup, or if your current batteries are worn. For blade-only replacements, buy the OEM twin-blade set separately (around $25-30). Not for other brands or deck sizes.