4.0Ah 40V Battery Replacement for GreenWorks 40V Battery 29472 29462 29252 2901319 20202 20642 21242 22262 22272 25312 25322 27062 G-Max Cordless Power Tools with 5V USB

What It Is

This is a 4.0Ah 40V lithium-ion battery replacement for GreenWorks G-Max cordless lawn mowers, string trimmers, blowers, and other 40V tools. It also includes a 5V USB port for charging phones or small devices.

Fitment & Compatibility

• Direct OEM replacements: Models 29472, 29462, 29252, 2901319, 20202, 20642, 21242, 22262, 22272, 25312, 25322, 27062.
• Not cross-compatible with GreenWorks 60V, 80V, or 24V systems.
• Check your tool’s voltage: This is a 40V battery only. Look for “40V” or “G-Max” on your tool or existing battery.
• Physical fit: Measures approximately 6.5 x 3.5 x 4 inches. Verify your battery compartment is deep enough—some older G-Max tools have slightly different latch designs.
• Aftermarket note: This is an OEM GreenWorks battery, not a third-party clone. No adapters needed.

Key Things to Know

• USB port: The 5V USB output (1A) is convenient for charging phones but drains the battery noticeably—expect ~2-3 full phone charges from a full battery.
• Installation difficulty: None. Slide the battery into the tool until it clicks. Remove by pressing the release button and pulling.
• Common gotcha: If your tool doesn’t power on after inserting, check that the battery is fully seated and the terminals are clean. Some users report the battery feels slightly tight in older G-Max tools—sand the rails lightly if needed.
• Charge time: Expect 1–2 hours on a standard GreenWorks 40V charger. The battery has no built-in charge indicator, so use a charger with a status light.

Should You Buy It

Buy this if you need a direct, OEM replacement for a worn-out GreenWorks 40V G-Max battery and want the added USB convenience. It’s a solid choice for occasional to moderate use—but if you need longer runtime for heavy mowing, consider a higher-capacity (5.0Ah) option.