WORX Battery 20V 4.0Ah Power Share PRO, WA3674

What It Is

The WORX WA3674 is a 20V 4.0Ah lithium-ion battery from the Power Share PRO line, designed to power compatible WORX cordless lawn mowers, string trimmers, blowers, and other yard tools. It offers higher capacity than standard 2.0Ah packs, extending runtime for larger lawns or heavier tasks.

Fitment & Compatibility

• Brand & Series: Works exclusively with WORX Power Share and Power Share PRO 20V tools and chargers. Not compatible with other brands (e.g., DeWalt, Ryobi, Black+Decker) or older WORX 18V systems.
• Model Check: Fits most WORX cordless mowers (e.g., WG779, WG780, WG790, WG791), trimmers, blowers, and chainsaws. Verify your tool’s manual or battery port shape—the WA3674 uses the standard Power Share slide-in interface.
• Charger: Compatible with all WORX 20V chargers (e.g., WA3742, WA3880). Do not use with 12V or 40V chargers.
• Physical Size: Measures approximately 5.5 x 3.1 x 2.5 inches. Ensure your tool’s battery bay has clearance (some older mowers may have tight fits with 4.0Ah packs due to slightly taller height vs. 2.0Ah).

Key Things to Know

• Quality & Runtime: 4.0Ah provides roughly double the runtime of a 2.0Ah battery—expect 30–45 minutes of mowing on a 16-inch mower, depending on grass conditions. The PRO line uses higher-grade cells for better heat dissipation and longer cycle life.
• Installation: Tool-free slide-on/off; no special tools or wiring required. Latch clicks firmly when seated.
• Common Gotchas:
  • The battery is heavier (about 1.2 lbs) than a 2.0Ah pack—noticeable on handheld trimmers but fine for mowers.
  • If stored cold (below 32°F), runtime drops significantly; let it warm to room temp before heavy use.
  • Not backward-compatible with WORX 20V tools made before 2015—check the battery port shape (rounded vs. square).
• Warranty: WORX covers this battery for 2 years (1 year for commercial use). Register online to activate.

Should You Buy It

Buy if you have a WORX cordless mower or trimmer and need longer runtime than the standard 2.0Ah pack offers—especially for lawns over 1/4 acre or when using high-draw tools like blowers. Skip it if you only need occasional use on a small yard (the 2.0Ah is cheaper and lighter) or if you own non-WORX tools.