ANTRobut 2Pack 8.0Ah Replacement for Worx 20V Battery WA3575 WA3525 Compatible with Worx Battery 20V and 2X20V Cordless Tools, with Fast Charger WA3881 WA3742 (NOT for Nitro)

What It Is

This is a two-pack of 8.0Ah aftermarket batteries and a fast charger, designed to power any Worx 20V or 2x20V cordless lawn mower, trimmer, blower, or other tool in that platform. It replaces original Worx WA3575 and WA3525 batteries, and works with WA3881 and WA3742 chargers.

Fitment & Compatibility

• Works with: Any Worx 20V or 2x20V tool (e.g., WG779, WG780, WG785 mowers; WG163, WG184 trimmers; WG520 blower) that uses the slide-in WA3575 or WA3525 battery.
• Does NOT work with: Worx Nitro series (40V or 60V) tools—these use a different battery platform.
• Physical fit: Batteries are standard slide-mount; measure 5.5” x 3.1” x 2.4” each. Check that your tool’s battery compartment has enough clearance if you’re using two at once on a 2x20V mower.
• OEM vs aftermarket: These are third-party replacements. They will charge on original Worx WA3881 or WA3742 chargers, but not on older WA3739 or WA3760 chargers. Verify your charger model before buying.

Key Things to Know

• Capacity: 8.0Ah per battery—significantly more runtime than the original 2.0Ah, 4.0Ah, or sometimes 5.0Ah packs. Expect 60-90 minutes of mowing on a single battery (depending on grass conditions and mower size).
• Installation: No tools needed. Slide battery onto tool until it clicks. For 2x20V mowers, insert both batteries and ensure the release tabs engage fully.
• Charger note: The included fast charger is rated at 4A output—charges an 8.0Ah battery in about 2 hours. It’s compatible with all Worx 20V slide-in batteries, but not with other brands.
• Common gotcha: These batteries are slightly taller than some original Worx packs. On certain 2x20V mowers (e.g., older WG780 models), the battery cover may not close fully. Test fit before use.

Should You Buy It

If you own several Worx 20V or 2x20V tools and want extended runtime without buying multiple smaller OEM packs, this is a solid value. The 8.0Ah capacity is ideal for larger mowers or long trimming sessions. However, if you have a Nitro-series tool or a very tight battery compartment, look for a slimmer aftermarket option or stick with OEM.