Powilling 40V 3.5Ah WA3580 Lithium Battery for Worx 40V Battery and Charger WA3580 WG180 WG280 WG380 WG580(Not for 2 * 20v)

What It Is

This is a 40V, 3.5Ah lithium-ion replacement battery for Worx cordless lawn mowers, string trimmers, blowers, and other outdoor power tools that use the WA3580 battery platform. It’s designed for medium-to-light yard work—enough runtime for a typical 1/4-acre lawn on a single charge.

Fitment & Compatibility

Check these before buying:

• Model fit: Works with Worx models that accept the WA3580 battery (e.g., WG180, WG280, WG380, WG580). Does not work with 2×20V tools (those use two 20V batteries in series).
• Physical dimensions: Same size as OEM WA3580—fits all Worx 40V tool battery compartments without modification.
• OEM vs. aftermarket: This is a third-party replacement. It will charge on any Worx 40V charger, but may not communicate battery status (e.g., fuel gauge) with some newer tool firmware.
• Measurements: 5.5” L × 3.5” W × 2.5” H; weight ~1.4 lbs. Confirm your tool’s battery bay is clear of debris before inserting.

Key Things to Know

• Installation: Drops in like OEM—no tools, no adapters. Push until it clicks. To remove, press the release button and pull.
• Runtime: 3.5Ah provides ~30–45 minutes of mowing on a 16–18” deck, depending on grass thickness. Less runtime than an OEM 4.0Ah or 5.0Ah.
• Quality notes: Mixed reviews on long-term cell consistency. Some users report capacity drop after 6–12 months. Avoid leaving it on the charger after full charge to prolong life.
• Gotcha: The plastic casing can be slightly tight in some older Worx tools. If it doesn’t slide in easily, check for burrs on the battery rails.

Should You Buy It

Buy this if you need an affordable backup or replacement for light-duty 40V Worx tools and don’t mind slightly shorter lifespan than OEM. Skip it if you rely on your mower for large lawns or need maximum runtime—spend more on a genuine Worx 4.0Ah or 5.0Ah battery for better long-term reliability.