2Packs WA3520 7.0Ah Li-ion Battery Replacement for Worx 20V Battery WXL1810 Compatible with WG151 WG151.5 WG155 WG155.5 WG251 WG251.5 WG255 WG540 WG540.5 WG890 WG891 Cordless Power Tools

What It Is

This is a 2-pack of 7.0Ah lithium-ion battery replacements designed for Worx 20V cordless tools, including lawn mowers (WG151, WG155, WG251, WG255 series), trimmers, blowers, and other power tools. Each battery provides extended runtime for medium-to-large yards.

Fitment & Compatibility

• Battery model: WA3520 (replaces Worx WXL1810).
• Works with: Worx 20V tools listed in the title (WG151, WG151.5, WG155, WG155.5, WG251, WG251.5, WG255, WG540, WG540.5, WG890, WG891). Not compatible with 40V or 24V systems.
• Check before buying: Verify your tool’s voltage (must be 20V) and battery slot shape. Aftermarket batteries may not fit all Worx chargers – confirm your charger accepts WA3520 style packs. Measure battery compartment depth if using in a mower (some aftermarket packs are slightly thicker).
• OEM vs aftermarket: This is a third-party replacement, not official Worx. Performance and lifespan may vary.

Key Things to Know

• Quality: 4.3 stars from 31 reviews – generally reliable, but some users report shorter lifespan than OEM (1–2 seasons vs 3–4).
• Installation: Drop-in fit for compatible tools; no modification needed. Charge fully before first use.
• Gotchas: May not charge in Worx 4A rapid chargers – use the standard 2A charger. Avoid deep discharges to prolong battery life.
• Performance: 7.0Ah offers ~40–50% more runtime than standard 4.0Ah Worx packs, good for larger lawns or heavy trimming.

Should You Buy It

If you have multiple compatible Worx 20V tools and want affordable extra runtime without buying OEM batteries, this 2-pack is a solid value. Not ideal if you need maximum durability or OEM reliability for daily commercial use.