20Volt Replace for Worx 20V Battery and Charger Kit, Compatible with Works 20Volt WA3520 WA3525 WA3575 WG151s WG251s WG540s WG545s WG890 WG891, with Worx 20V Battery Charger

What It Is

This is a third-party 20V battery and charger kit designed to replace the Worx WA3520, WA3525, and WA3575 batteries, plus the WA3770 charger. It powers any Worx 20V tool—lawn mowers, trimmers, blowers, chainsaws, and more—that uses the standard WA-series slide-on battery platform.

Fitment & Compatibility

• Check model numbers: Works with Worx tools ending in “s” or “l” that accept 20V WA-series batteries—e.g., WG151s, WG251s, WG540s, WG545s, WG890, WG891. Also fits older models like WG150, WG250, WG543, WG550.
• Not for 40V or 56V tools: This is strictly 20V. Do not use on any Worx 40V (WA-series with “4” prefix) or 56V (Power Share Pro) equipment.
• Physical fit: The battery slides onto the same rail as OEM Worx 20V packs. No adapter needed. The charger plugs into a standard 120V AC outlet.
• OEM vs aftermarket: This is not a genuine Worx product. It is a compatible replacement. The plastic mold and internal cells differ from OEM, but the slide mechanism and voltage are identical.

Key Things to Know

• Capacity: Typical aftermarket 20V packs are 2.0Ah to 4.0Ah. Check the listing for exact amp-hour rating—lower Ah means less run time but lighter weight.
• Installation: No tools required. Slide battery onto tool until it clicks. Plug charger into wall, insert battery, and the LED indicates charging status.
• Charger quality: The included charger may charge slower than the original Worx WA3770 (often ~1.5–2A vs 2.5A). Expect 2–4 hours for a full charge on a 2.0Ah pack.
• Battery life: Aftermarket cells can degrade faster than OEM. You may see reduced run time after 6–12 months of heavy use. Keep the battery stored at room temperature and avoid full discharges to extend life.

Should You Buy It

If you already own a Worx 20V tool and need a spare battery or a replacement for a worn-out OEM pack—and you’re on a budget—this kit is a solid value. It’s less reliable for daily professional use but perfectly fine for occasional lawn and garden tasks. Skip it if you want OEM longevity or need the fastest possible charging.