Greenworks 40V 4.0Ah USB Lithium-Ion Battery (Genuine Greenworks Battery / 75+ Compatible Tools)

What It Is

This is a genuine Greenworks 40V 4.0Ah lithium-ion battery with a built-in USB port for charging phones or small devices. It powers any Greenworks 40V tool (mowers, trimmers, blowers, chainsaws) and works as a portable power bank.

Fitment & Compatibility

• Tool compatibility: Fits all Greenworks 40V cordless tools (75+ models). Check your tool’s model number; if it’s 40V and Greenworks, this battery works.
• Battery type: Genuine OEM – not aftermarket. Avoid third-party “compatible” batteries; they often lack proper voltage regulation and may damage your tool.
• Physical check: Measure battery slot dimensions (approx. 5.5" x 3.5" x 2.5"). Ensure your tool’s battery bay has clearance for the USB port cover on top.
• Charger: Uses Greenworks 40V charger (sold separately if you don’t have one). Not compatible with 80V or 24V chargers.

Key Things to Know

• Installation: Dead simple – slide into tool’s battery slot until it clicks. No tools required.
• USB output: The built-in USB-A port delivers 5V/2.1A – good for phones, not tablets or high-drain devices. Port is only active when battery is not in a tool.
• Run time: 4.0Ah gives about 45–60 minutes on a 20-inch mower (self-propelled), or 30–40 minutes on a high-drain trimmer. Real-world runtime varies with load.
• Weight: ~2.5 lbs – heavier than 2.0Ah packs, but lighter than 5.0Ah. Fine for handheld tools, but noticeable on a string trimmer.
• Gotcha: The USB port cover is plastic and can snap off if forced. Keep it closed when not in use to prevent debris ingress.

Should You Buy It

Buy this if you already own Greenworks 40V tools and need a mid-capacity spare battery with charging convenience for your phone on the go. Skip it if you only need maximum runtime (get the 5.0Ah) or if you’re on a tight budget (aftermarket batteries are cheaper but riskier). It’s a solid, reliable OEM choice for most homeowners.