4.0Ah High Capacity Battery Replacement for 40v Greenworks Battery and Charger,Compatible with Greenworks 40V Power Tools

What It Is

This is a 4.0Ah lithium-ion replacement battery for Greenworks 40V cordless lawn mowers, trimmers, blowers, and other 40V power tools. It provides longer runtime than standard 2.0Ah or 2.5Ah batteries, ideal for medium to large lawns (up to 1/3 acre) on a single charge.

Fitment & Compatibility

• Brand & voltage: Works only with Greenworks 40V tools and chargers (not 60V or 80V). Check the label on your tool or charger for “40V.”
• Model series: Compatible with most Greenworks 40V mowers (e.g., 25312, 25322, 2600402), string trimmers (ST40B00, ST40B10), and blowers. Not compatible with older G-Max 40V tools that use a different battery shape.
• Physical fit: Dimensions are 5.5 x 3.5 x 3.0 inches. Measure your battery compartment depth—some compact mowers may not accept this taller 4.0Ah pack.
• OEM vs aftermarket: This is a third-party battery, not Greenworks original. It will charge on any Greenworks 40V charger (standard or rapid), but may not trigger the charger’s full fast-charge cycle.

Key Things to Know

• Quality: Cell quality is generally good for the price, but lifespan may be shorter than OEM (expect 2-3 seasons vs 4-5 with genuine Greenworks). Avoid leaving it on the charger for days.
• Installation: Zero difficulty—slide onto tool until it clicks. No wiring or tools needed.
• Gotchas: The battery gauge (LED lights) may be less accurate than OEM. Also, some users report it doesn’t fit snugly in older mower battery trays—test before buying if you have a pre-2018 model.
• Charging: Use only Greenworks 40V chargers. Never mix with 60V or 80V chargers—will damage the battery.

Should You Buy It

Buy this if you need a budget-friendly spare battery for a Greenworks 40V mower or trimmer and don’t mind slightly shorter lifespan versus OEM. It’s a solid value for casual homeowners with 1/4- to 1/3-acre lawns. Skip it if you demand OEM reliability for commercial use or need perfect fitment in very compact tools.