2 Pack 3.5Ah Replacement for Worx 20V Battery PowerShare Compatible with All Worx Batteries 20V WA3520 WA3525 WA3575 WG251s WG255s WG540s WG890 WG891

What It Is

This is a 2-pack of 3.5Ah lithium-ion replacement batteries for the Worx 20V PowerShare platform. They power any Worx 20V tool—lawn mowers, trimmers, blowers, chainsaws, and more—that uses the slide-on battery interface.

Fitment & Compatibility

• Works with all Worx 20V PowerShare tools (e.g., WG251s, WG255s, WG540s, WG890, WG891) and replaces OEM models WA3520, WA3525, WA3575.
• Check battery compartment shape: These use the standard slide-on mount—not the older clip-on or pod-style batteries. If your tool has a rectangular slide-in slot on the handle or base, it fits.
• Not compatible with 40V or 80V Worx tools or any non-Worx brand.
• Physical size: Roughly 5.5 x 3 x 2.5 inches. Measure your existing battery compartment to ensure clearance, especially on compact mowers like the WG251s.

Key Things to Know

• 3.5Ah capacity is middle-of-the-road—good for 20–30 minutes of mowing on a small lawn, but less runtime than 5.0Ah or larger packs.
• Aftermarket quality: Some users report slightly shorter lifespan than genuine Worx batteries, but most find them reliable for light-to-moderate use. Not recommended for heavy daily commercial work.
• Installation: No tools required—slide on until it clicks, press release tab to remove. Works with existing Worx charger.
• Common gotcha: The charge indicator lights on these may not match OEM specs. If one light stays dim, it’s often a cosmetic issue, not a failure.

Should You Buy It

Buy this 2-pack if you own multiple Worx 20V tools and need affordable backup batteries for light yard work—mowing a small lawn, trimming edges, or blowing leaves. Skip it if you need maximum runtime for large properties or plan to use the battery daily in commercial conditions; genuine Worx or higher-capacity packs will last longer.