2 Packs 20V 4.0Ah WA3520 Battery Replacement for Worx 20V Battery Power Share WA3575 WA3525 WG151s WG155s WG251s WG255s WG540s WG545s WG890 WG891 Compatible with Worx 20V Cordless Tools

What It Is

This is a 2-pack of 20V 4.0Ah lithium-ion replacement batteries designed to power Worx 20V cordless lawn mowers, trimmers, blowers, and other tools in the Power Share platform. Ideal for users needing extended runtime for medium-sized yards or multi-tool use.

Fitment & Compatibility

• Models: Compatible with WA3520, WA3575, WA3525 batteries and tools like WG151s, WG155s, WG251s, WG255s, WG540s, WG545s, WG890, WG891. Also works with any Worx 20V Power Share tool.
• OEM vs Aftermarket: This is a third-party replacement, not Worx OEM. It fits physically and electrically, but may not charge in all Worx chargers—test with your existing charger first.
• Voltage & Capacity: 20V (18V nominal) / 4.0Ah. Higher capacity than standard 2.0Ah packs, so heavier but longer runtime.
• Physical Check: Ensure your tool’s battery compartment is deep enough for the 4.0Ah pack (slightly larger than 2.0Ah). Measure if unsure.

Key Things to Know

• Quality Variance: Some users report slightly shorter lifespan than OEM Worx batteries. Consistent with aftermarket pricing.
• Charger Compatibility: Works with most Worx 20V chargers, but not all. If your charger blinks red/green rapidly, it may reject these packs.
• Installation: No tools needed—slides directly into battery port. Ensure it clicks securely before use.
• Runtime: 4.0Ah gives ~2x runtime of standard 2.0Ah. Good for mowing 1/4 acre or heavy trimming sessions.

Should You Buy It

Buy this if you need affordable backup batteries for multiple Worx 20V tools and don’t mind slightly shorter lifespan than OEM. Avoid if you require guaranteed compatibility with older Worx chargers or prefer original equipment reliability. Good value for casual users with medium workloads.