Greenworks 80V 21" Cordless Push Lawn Mower – Brushless Motor, LED Lights, 4.0Ah Battery & Rapid Charger (75+ Compatible Tools)

What It Is

This is a complete battery-and-charger kit for the Greenworks 80V platform, including a 4.0Ah lithium-ion battery and rapid charger. It powers the 21" cordless push mower (and 75+ other 80V tools) and is designed for medium-to-large lawns up to about 0.5 acres.

Fitment & Compatibility

• Deck size: Works with Greenworks 21" mower (model MO80L210 or newer). Check your mower’s model number on the underside of the deck or owner’s manual.
• Battery platform: Only compatible with Greenworks 80V tools (G-MAX 80V). Will NOT work with 40V or 60V models.
• OEM vs aftermarket: This is OEM Greenworks. Aftermarket batteries may fit but can void warranty and often lack the same charging safety circuits.
• Physical check: Battery slides into the mower’s rear or side port. Measure your existing battery compartment—4.0Ah pack is slightly taller than the 2.0Ah; ensure clearance if storing under a seat.

Key Things to Know

• Quality: Brushless motor is reliable, but the plastic battery housing can crack if dropped on concrete. Handle with care.
• Installation: No tools needed—just slide battery into mower until it clicks. Charger plugs into standard 120V outlet; full charge takes ~60 minutes.
• Common gotcha: The 4.0Ah battery gives ~30-45 minutes of runtime on a full mow (thick grass will drain faster). If your lawn is over 0.5 acres, consider a second battery.
• LED lights: The mower’s LED headlights run off the same battery—no separate power needed, but they reduce total runtime by about 10%.

Should You Buy It

Buy this if you already own a Greenworks 80V mower and need a spare battery/charger for longer mowing sessions, or if you’re starting fresh with the 80V platform and want a reliable, fast-charging setup for a medium lawn. Skip it if you have a smaller 40V system or need a battery for heavy-duty commercial use.