40V 3.5Ah Battery Replacement for Worx 40V Battery WA3580 Compatible with Worx 40 Volt Cordless Poewer Tools WG180 WG280 WG380 WG580 (Don't USE in Nitro Series WG185 & 2 * 20V Tools)

What It Is

This is a 40V 3.5Ah lithium-ion battery replacement for Worx 40V cordless lawn mowers, trimmers, blowers, and other outdoor power tools. It’s designed for use in models like WG180, WG280, WG380, and WG580, providing the power to run your equipment without being tethered to a wall outlet.

Fitment & Compatibility

Before buying, confirm your tool’s model number. This battery fits Worx 40V tools except the Nitro Series (WG185) and any 2×20V tools (which require two 20V batteries). It is an aftermarket replacement for the OEM Worx WA3580. Check the battery compartment dimensions: this unit measures approximately 5.1 x 3.5 x 2.6 inches. If your original battery slides in and locks with the same shape and latch, it will likely work. Do not assume all 40V Worx batteries are interchangeable—always verify your tool’s specific model number.

Key Things to Know

• Quality variance: Aftermarket batteries often have lower cell quality than OEM. Expect shorter runtime and faster degradation over time compared to a genuine Worx WA3580.
• No installation required: Simply slide the battery into the tool until it clicks. No tools or wiring needed.
• Charger compatibility: This battery works with any Worx 40V charger (standard or rapid). It does not include a charger.
• Common gotcha: Some users report slight fitment tightness on certain tools. If it doesn’t slide in easily, do not force it—check for debris or damage.

Should You Buy It

Buy this if you need a budget-friendly backup or replacement for a worn-out Worx 40V battery and don’t mind slightly shorter runtime and a non-OEM build. It’s a decent value for light-duty use like trimming or edging, but for heavy mowing or frequent use, invest in the genuine Worx WA3580 for better longevity and reliability.