6.5Ah Lithium-Ion Battery Replacement for Greenworks 40V Battery 29462 29472 Compatible with Greenworks 40V G-MAX for Power Tools Lawn Mower 29252 20202 22262 25312 25322, with USB Port

What It Is

This is a 6.5Ah lithium-ion battery replacement for Greenworks 40V G-MAX power tools and lawn mowers. It provides longer runtime than standard 2.0Ah or 4.0Ah packs, suitable for medium-to-large yards (up to ½ acre) and high-draw tools like string trimmers, leaf blowers, and chainsaws.

Fitment & Compatibility

• OEM compatibility: Works with Greenworks 40V G-MAX batteries (models 29462, 29472) and tools listed: 29252, 20202, 22262, 25312, 25322. Not compatible with Greenworks 60V or 80V systems.
• Physical check: Measure your existing battery compartment – this pack is 6.3″ x 4.1″ x 3.5″. Confirm it slides in without forcing, especially on older mower decks (pre-2018).
• USB port: Integrated USB output (5V/2.1A) works for charging phones/devices, but drains the battery faster. Verify your tool’s battery bay has clearance for the USB cover.
• Aftermarket note: This is a third-party replacement, not OEM. It may lack the “fuel gauge” LEDs or have slightly different latch feel. Check that your charger (Greenworks 40V) accepts third-party packs – some newer chargers have chip detection.

Key Things to Know

• Runtime: 6.5Ah gives roughly 60–75 minutes on a 21″ mower (self-propelled) or 90+ minutes on a trimmer. Expect 50% more runtime than a 4.0Ah pack.
• Installation: No tools – just slide onto the battery base until it clicks. The USB port is a bonus, but avoid using it while mowing (vibration may loosen connection).
• Charging: Use only Greenworks 40V chargers (or compatible third-party units). Full charge from empty takes 2–3 hours. Do not charge in freezing or direct sun.
• Common gotcha: Aftermarket batteries may not trigger the low-battery warning on some tools – stop mowing when power drops noticeably to avoid deep discharge damage.

Should You Buy It

Buy this if you need a budget-friendly spare for a Greenworks 40V G-MAX mower or trimmer and want longer runtime than the stock 2.0Ah/4.0Ah packs. Skip it if you require OEM reliability, use a 60V/80V system, or need guaranteed fuel gauge compatibility – in those cases, stick with the genuine Greenworks 29472.