Upgraded Replacement for Greenworks 40V 4.0Ah Battery, Compatible with Greenworks 40V Lithium-Ion Battery 29462 29472 & G-MAX Power Tools 25302 25322 1242 29252, Delivers Extended Long Runtime

What It Is

This is a 40V 4.0Ah lithium-ion battery replacement for Greenworks cordless lawn mowers, string trimmers, blowers, and other G-MAX 40V tools. It provides longer runtime than the standard 2.0Ah or 2.5Ah packs, ideal for medium to large yards or heavy-drain equipment.

Fitment & Compatibility

Check these before buying:

• Voltage and platform: Must be a Greenworks 40V G-MAX tool (not 60V, 80V, or 24V). Look for the G-MAX logo on your tool or battery port.
• Model numbers: Directly replaces OEM batteries 29462, 29472, 25302, 25322, 1242, 29252. Also fits any tool that originally used these packs (e.g., mowers 25312, 25302, trimmers 21352, blowers 24252).
• Physical fit: This battery is the same shape and slide-mount design as OEM 40V G-MAX packs. It will not fit older Greenworks 24V or non-G-MAX 40V tools (e.g., some early 40V mowers with a different latch system).
• Charging: Works with any Greenworks 40V G-MAX charger (model 29482, 29472, 29252, etc.). Do not use with non-40V chargers.

Measurements: Approximately 5.5" x 3.5" x 3.5". Weight ~1.5 lbs. Check your tool battery compartment depth if you have a tight fit (most mowers have ample space).

Key Things to Know

• Quality vs OEM: This is an aftermarket replacement. Cells may be lower-grade than genuine Greenworks, so expect slightly shorter lifespan (fewer charge cycles) and potential for slightly less peak power under heavy load.
• Installation: Drop-in fit—no tools or modifications needed. Slide onto tool until it clicks. If it doesn’t latch, check for debris or damage on the battery rails.
• Runtime: 4.0Ah capacity gives roughly double the runtime of a 2.0Ah pack. Expect 30–45 minutes of mowing on a 20" mower, depending on grass conditions.
• Charging note: The battery may take 2–3 hours to fully charge with a standard charger. It will not charge faster than OEM packs.

Should You Buy It

Buy this if you need a spare or replacement 40V G-MAX battery on a budget and don’t require OEM longevity. It’s a solid value for occasional mowing or light-duty tools, but if you mow multiple acres weekly or rely on the tool for commercial work, invest in the genuine Greenworks battery for better cycle life and reliability.