Replacement for Worx Battery 20V and Charger for 20V Lithium Battery WA3520 WA3525 WA3575 WG151s WG155s WG251s WG255s

What It Is

This is a 20V lithium-ion battery replacement (and optional charger) for Worx cordless lawn mowers, string trimmers, leaf blowers, and other Power Share tools. It’s designed to power small-to-medium yard equipment where the original Worx battery has worn out or is missing.

Fitment & Compatibility

Check your tool’s voltage and platform: This battery works only with Worx 20V Power Share tools. It is not compatible with 40V or 56V Worx systems.
Model numbers confirmed: Fits WA3520, WA3525, WA3575, and tools WG151s, WG155s, WG251s, WG255s.
Physical size: The battery measures roughly 4.5 x 3 x 2.5 inches. Measure your existing battery compartment to ensure a snug fit—some Worx mowers have tight cavities.
OEM vs aftermarket: This is a third-party replacement, not an official Worx part. It may lack the exact charge indicator or latch feel of the original.
Charger compatibility: If buying the bundle, confirm your tool uses a standard Worx 20V charger port (barrel-style DC jack). The included charger is a basic wall plug, not a rapid charger.

Key Things to Know

• Installation: Drop-in replacement. No tools or wiring needed—just slide the battery into the tool until it clicks.
• Quality & lifespan: Expect 80–90% of original run time. Cells are typically Chinese-made; some users report shorter lifespan (1–2 seasons vs. 2–3 for OEM).
• Charge indicator: The built-in LED charge gauge may be less accurate than the original Worx battery—test it after a full charge.
• Common gotcha: The battery may be slightly thicker than OEM, causing a tight fit in some Worx mower models (e.g., WG155s). If it doesn’t slide in easily, do not force it—return and try a different aftermarket brand.

Should You Buy It

Buy this if you need a low-cost backup or replacement for a dead Worx 20V battery and don’t mind slightly shorter run time and a snug fit. It’s a good budget option for occasional use on small lawns or light trimming. Skip it if you need maximum runtime, rapid charging, or a perfect OEM fit—stick with an official Worx battery for those needs.