High Capacity 2-Pack 8.0Ah Lithium Ion Batteries Replacement for Worx Battery 20V Compatible with WA3578 WA3575 WA3520 WA3525 Cordless Tool Battery Packs

What It Is

This is a 2-pack of 8.0Ah 20V lithium-ion replacement batteries designed for Worx cordless lawn mowers, trimmers, blowers, and other 20V Power Share tools. They offer high capacity for longer run time on larger yards or heavy-duty trimming.

Fitment & Compatibility

These batteries are aftermarket replacements for Worx 20V Power Share platform. They are compatible with Worx models using WA3578, WA3575, WA3520, or WA3525 battery packs. Before buying, verify your tool’s battery compartment accepts the 20V slide-in design (not the 40V or 56V system). Check your mower’s model number—these fit most Worx cordless mowers (e.g., WG779, WG780, WG781) but not older 18V-only tools. Also confirm the physical dimensions: each battery is roughly 5.5 x 3.5 x 2.5 inches. If your tool requires a specific battery latch or contact pin layout, compare with your original battery.

Key Things to Know

• Capacity vs. OEM: 8.0Ah is higher than standard Worx 2.0Ah or 4.0Ah packs, meaning longer runtime but slightly heavier weight. Expect ~60-90 minutes of mowing on a 20V mower.
• Aftermarket quality: These are third-party, not Worx OEM. Some users report slightly shorter lifespan or slightly slower charging compared to genuine Worx batteries. Check return policy before purchase.
• Charger compatibility: Works with Worx 20V chargers (e.g., WA3742, WA3730). Do not use with 40V or 56V chargers.
• Installation: No tools needed—slide battery into tool until it clicks. Ensure latch engages firmly. If battery wobbles or doesn’t click, it may be incompatible with your specific tool model.

Should You Buy It

Buy this 2-pack if you own multiple Worx 20V tools and need extra runtime for larger lawns or heavy trimming, and you’re comfortable with aftermarket batteries to save money over OEM. Skip it if you require guaranteed OEM performance, long-term reliability, or if your tool uses a different voltage platform.