energup 2Pack 4.0Ah WA3525 Replace for Worx 20V Battery PowerShare for WA3520 WA3525 WA3575 WG890 WG891 for 20Volt Worx Batteries 20V

What It Is

This is a 2-pack of 4.0Ah lithium-ion replacement batteries for Worx 20V PowerShare tools. It powers any Worx 20V cordless mower, trimmer, blower, or chainsaw that uses the WA3520, WA3525, WA3575, or WA3576 battery platform.

Fitment & Compatibility

• Works with: All Worx 20V PowerShare tools (lawn mowers, string trimmers, leaf blowers, hedge trimmers, chainsaws, etc.) that accept WA3520, WA3525, WA3575, or WA3576 batteries.
• Does NOT fit: Worx 40V, 56V, or 60V tools, or older 18V Worx models. Also incompatible with non-Worx brands.
• Physical check: These are aftermarket replacements—dimensions match OEM Worx batteries exactly, so they slide into the same battery slot. No adapter needed.
• Charger compatibility: Works with any Worx 20V charger (WA3740, WA3741, WA3730, etc.). Do not use a 40V or 56V charger.
• Before buying: Verify your tool’s battery model number (printed on the original battery) matches WA3520/WA3525/WA3575. If your tool uses a different battery shape (e.g., older 18V slide-pack), these won’t work.

Key Things to Know

• Aftermarket quality: These are not OEM Worx batteries. Users report slightly shorter runtime (10-15% less) than genuine WA3525, but still solid for the price. Some units have inconsistent cell quality—test immediately.
• No smart features: Lacks Worx’s proprietary battery management system (BMS) that prevents over-discharge in some tools. Stop using when power drops noticeably to avoid damaging the cells.
• Installation: Dead simple—slide in until it clicks. No tools required. Charge fully (3-4 hours) before first use.
• Common gotcha: The 4.0Ah rating is accurate for new cells, but after ~100 charge cycles, runtime drops faster than OEM. Expect 1.5-2 years of moderate use before noticeable degradation.

Should You Buy It

Buy this if you need affordable spare batteries for multiple Worx 20V tools and don’t mind slightly shorter runtime and shorter overall lifespan vs. genuine Worx. It’s a good budget option for light-to-medium yard work (mowing a small lawn, trimming edges). Skip it if you rely on your tools for heavy commercial use or need maximum runtime—spring for OEM or a higher-capacity aftermarket pack.