20V 2Packs Replacement Battery and Charger Starter Kit， Cell9102 WA3520 Lithium Battery and Charger WA3742 Compatible with Worx 20-Volt Cordless Power Tools

What It Is

This bundle includes two 20V 2.0Ah lithium batteries (Cell9102) and a rapid charger (WA3520), designed to replace or supplement the WA3520/WA3742 batteries and charger for Worx 20V cordless tools—including lawn mowers, trimmers, blowers, and chainsaws.

Fitment & Compatibility

• Check your tool’s voltage: Works only with Worx 20V (not 40V or 56V) tools.
• Battery model: Replaces WA3520, WA3742, WA3550, WA3551, and WA3579. Not compatible with older 18V Worx tools.
• Charger model: The included WA3520 charger is compatible with all Worx 20V batteries (2.0Ah, 4.0Ah, etc.).
• Physical fit: Batteries are slide-mount, same size as original. No deck-size or mower-width checks needed—just ensure your tool uses a slide-in 20V battery.
• OEM vs aftermarket: This is an aftermarket kit (not Worx OEM), but specifically claims compatibility with Worx 20V tools. Verify your tool’s battery slot shape (rectangular slide) matches.

Key Things to Know

• Capacity: 2.0Ah per battery – good for light mowing (small yards) or trimming, but may run out quickly on a full-size mower (expect ~20-30 minutes per battery).
• Installation: Drop-in replacement – no wiring or modifications. Unlock old battery, slide in new one.
• Charger speed: The WA3520 charger is a standard 1.5A charger (not rapid). A full 2.0Ah battery takes about 80 minutes to charge.
• Common gotcha: Some users report the battery indicator lights may not match OEM exactly, but function is the same. Avoid mixing with 40V tools – they won’t fit.

Should You Buy It

If you already own Worx 20V tools (especially a lawn mower or trimmer) and need extra runtime or a backup charger, this kit offers good value at $57.99. It’s ideal for small-to-medium yards where two 2.0Ah batteries will cover a full mow, but not for heavy-duty users who need larger 4.0Ah+ batteries.