2 Packs 6.0Ah Replacement for Worx 20V Battery, Compatible with WORX 20 Volt Max Cordless Tools WA3575 WA3578 WA3520 WA3525 WA3742 WA3847 WA3881 WG151s WG155s WG251s WG255s WG540s WG545s WG890 WG891

What It Is

This is a 2-pack of 6.0Ah aftermarket batteries for Worx 20V cordless lawn mowers, trimmers, and other tools. Designed to replace OEM Worx batteries (like WA3575, WA3578), they offer higher capacity for longer runtime on mowers, blowers, and string trimmers.

Fitment & Compatibility

• Voltage & Chemistry: 20V Max (18V nominal) lithium-ion. Works with all Worx 20V tools, including WA3575, WA3578, WA3520, WA3525, WA3742, WA3847, WA3881, and WG-series models (WG151s, WG155s, WG251s, WG255s, WG540s, WG545s, WG890, WG891).
• Physical Fit: Same slide-on mount as OEM. No modifications needed. Check that your tool uses the standard Worx 20V battery platform (not the older 18V or 40V systems).
• Deck Size/Mower: Compatible with all Worx 20V mowers (e.g., WG779, WG780, WG782, WG784). No deck size restrictions—battery fits all.
• Aftermarket Note: Not made by Worx. Verify your tool’s model number against the list. If you have a 20V tool not listed, it likely still fits as long as it uses the standard Worx 20V slide-in battery.

Key Things to Know

• Capacity vs. OEM: 6.0Ah gives about 50% more runtime than the standard 4.0Ah Worx battery. Good for larger lawns or longer trimming sessions.
• Installation: Drops in and clicks—no tools needed. Charge with any Worx 20V charger (WA3742, WA3881, or compatible third-party).
• Quality & Safety: Aftermarket. Check for UL or CE certification. Some users report slightly shorter lifespan than OEM. Avoid extreme heat/cold during charging.
• Common Gotcha: May not fit Worx 40V tools or older 18V models. Also, the battery indicator (if present) may not match OEM accuracy.

Should You Buy It

Buy if you need extra runtime for a Worx 20V mower or trimmer and want to save money over OEM. Skip if you prioritize brand reliability, long-term durability, or have a 40V tool—stick with genuine Worx batteries.