2 Packs 40V 3.0Ah WA3580 Lithium Battery Replacement for Worx 40V Battery, Compatible with Worx 40V Cordless Power Tools WG180 WG280 WG380 WG580 WG776 & Chargers WA3747 WA3877 (Not Fit for 2x20V Tool)

What It Is

This is a two-pack of 40V 3.0Ah lithium-ion replacement batteries for Worx 40V cordless tools. Designed for lawn mowers, string trimmers, blowers, and chainsaws that use the WA3580 platform.

Fitment & Compatibility

• Compatible Worx models: WG180, WG280, WG380, WG580, WG776, and most other 40V Worx tools that accept the WA3580 battery. Also works with WA3747 and WA3877 chargers.
• Not compatible with: 2x20V tools (those that require two 20V batteries). Check your tool’s battery compartment—if it takes a single 40V pack, this fits.
• OEM vs aftermarket: This is a third-party replacement, not a genuine Worx part. Performance and lifespan may differ from OEM.
• Measurement check: Physical dimensions match standard Worx 40V packs. Ensure your tool’s battery bay isn’t unusually narrow or obstructed (rare, but verify if your model is older or a niche variant).

Key Things to Know

• Quality: 3.0Ah capacity is mid-range—enough for most mowing jobs on a standard lawn (up to 1/4 acre per pack with a single battery). Expect slightly shorter runtime than OEM 4.0Ah or 5.0Ah packs.
• Installation: No tools needed. Slide battery into tool until it clicks. Remove by pressing the release button and pulling out. Takes 10 seconds.
• Gotcha: Some users report these aftermarket packs don’t charge on all Worx chargers—check your charger model (WA3747 or WA3877) before buying. If you have an older or third-party charger, test compatibility.
• Safety: Use only with 40V tools. Do not attempt to use in 2x20V tools or force into incompatible chargers (fire risk).

Should You Buy It

Buy this if you already own a Worx 40V tool and need affordable backup batteries for light-to-medium yard work. It’s a solid budget option for extending runtime, but if you rely on heavy-duty mowing or need maximum longevity, stick with genuine Worx batteries.