40V 3.5Ah WA3580 Replacement Lithium Battery for Worx 40V Battery,Compatible with 40 V Tools WG180 WG280 WG380 WG580（Not for 2x20V Tools）

What It Is

This is a 40V 3.5Ah lithium-ion replacement battery for Worx 40V cordless lawn mowers, trimmers, and blowers. It powers tools like the WG180, WG280, WG380, and WG580—but not 2x20V models.

Fitment & Compatibility

• Model check: Works with Worx 40V tools WG180, WG280, WG380, WG580. Does NOT fit 2x20V (dual-battery) tools.
• OEM vs. aftermarket: This is a WORX-branded battery, not a third-party knockoff. It’s a direct OEM replacement for the original WA3580.
• Physical fit: Same dimensions and slide-mount as the original. No adapter needed.
• Voltage & Ah: 40V, 3.5Ah—identical to the stock battery. Higher Ah (e.g., 5.0Ah) will run longer but may be physically larger; this one matches original size.
• What to measure: If unsure, compare your old battery’s label (model number WA3580) and check the tool’s manual for 40V compatibility.

Key Things to Know

• Installation: Slide on, click in—takes 5 seconds. No tools or wiring.
• Charger: Works with any Worx 40V charger (sold separately if you don’t have one).
• Run time: 3.5Ah gives ~30–45 minutes of mowing on a small lawn (under 1/4 acre). Less with heavy grass or full throttle.
• Gotcha: If your tool is 2x20V (two battery slots), this single 40V battery won’t work. Double-check your tool’s model number.

Should You Buy It

Yes, if you need a direct drop-in replacement for a dead WA3580 in a Worx 40V mower, trimmer, or blower. It’s a genuine OEM part at a fair price. Skip it if you own a 2x20V tool or want longer run time—look for a 5.0Ah battery instead.