2-Pack 6.5Ah Battery Replacement for Worx 20V Battery Power ShareWA3575 WA3525 WA3578 WA3520 WA3742 WA3669 WG155s WG251s WG890 WG890 WG891 Compatible with Worx 20 Volt Max Cordless Tools

What It Is

This is a 2-pack of 6.5Ah lithium-ion batteries designed to replace Worx’s 20V Power Share batteries. They’re for cordless lawn mowers (like the WG155s, WG251s), trimmers, blowers, and other Worx 20V Max tools that use the slide-on battery interface. The higher 6.5Ah capacity extends runtime compared to standard 2.0Ah or 4.0Ah batteries.

Fitment & Compatibility

• Models: Works with Worx 20V Power Share batteries WA3575, WA3525, WA3578, WA3520, WA3742, WA3669, and tools WG155s, WG251s, WG890, WG891. Also compatible with any Worx 20V Max cordless tool using the same slide-on mount.
• Check before buying: Ensure your tool uses the rectangular slide-on battery port (not the older round or post-style). Measure battery compartment depth—these are slightly taller than 2.0Ah packs. Verify your charger supports 6.5Ah capacity (most Worx chargers do, but older units may take longer). Not compatible with 40V or 80V Worx systems.
• Aftermarket note: This is a third-party replacement, not OEM Worx. It may have slightly looser fit or different plastic texture, but the slide mechanism and contacts are designed to match.

Key Things to Know

• Quality & safety: Aftermarket batteries may use lower-grade cells. Some users report shorter lifespan or faster capacity fade than genuine Worx packs. Look for built-in overcharge/short-circuit protection in the listing.
• Installation: No tools needed—slide onto tool until it clicks. Ensure the release latch engages fully. If it feels loose, check for debris on contacts or the slide rails.
• Common gotcha: These may not charge on Worx’s “rapid” chargers (e.g., WA3880) if the charger detects non-OEM cells. Use the standard Worx charger (WA3742 or similar) for best results.
• Storage: Keep at 40-80% charge if storing unused for months. Avoid extreme heat or cold.

Should You Buy It

Buy this if you have multiple Worx 20V tools and need extra runtime for larger lawns or heavy use, and you’re comfortable with aftermarket batteries at a lower price than OEM. Skip it if you prioritize long-term reliability and safety certifications—stick with genuine Worx batteries for critical tools or if your charger is finicky with third-party packs.