20V 3.5Ah Replacement for Worx 20V Battery and Charger Kit Compatible with Worx 20 Volt Battery WA3520 WA3525 WA3575 WA3577 WA3669 and WA3875 Dual Port Charger

What It Is

This is a 20V 3.5Ah replacement battery and dual-port charger kit designed for Worx cordless lawn mowers, trimmers, blowers, and other 20V Power Share tools. It’s a higher-capacity aftermarket alternative to OEM Worx batteries, extending runtime for medium to large yards.

Fitment & Compatibility

Before buying, verify your tool uses the Worx 20V Power Share platform—this battery fits models that originally accept WA3520, WA3525, WA3575, WA3577, WA3669, or WA3875 batteries. Check the battery compartment shape: it must match the slide-mount design of Worx 20V tools. This kit includes a dual-port charger that works with both the replacement battery and original Worx 20V batteries. Measure the battery dimensions (approx. 5.5 x 3 x 2.5 inches) to ensure clearance in your mower’s battery bay. Not compatible with 40V or 56V Worx tools.

Key Things to Know

• Capacity vs. OEM: 3.5Ah provides ~40% more runtime than standard 2.0Ah Worx batteries, but slightly less than genuine 4.0Ah units. Expect 30-45 minutes of mowing on a 1/4 acre lawn.
• Charger note: The dual-port charger charges one battery at a time (not simultaneously). It’s a standard 1A charger—full charge takes about 3.5 hours for a depleted 3.5Ah pack.
• Build quality: Aftermarket cells may have slightly shorter lifespan than OEM (300-500 cycles vs. 500-800). The plastic housing is durable but not impact-proof—avoid dropping.
• Compatibility check: If your Worx mower has a battery lock or latch, ensure the replacement’s slide rails align exactly. Some aftermarket batteries have slightly looser fit; test before fully engaging.

Should You Buy It

Buy this if you need a budget-friendly spare battery for a Worx 20V mower or trimmer and want longer runtime than the standard 2.0Ah pack, without paying OEM prices. Skip it if you demand maximum cycle life or need a charger that charges both ports at once—genuine Worx dual-port chargers charge sequentially but have better quality control.