DTK 20V 3.5Ah Battery Replacement for Worx 20V Battery WA3525 WA3578 WA3575 WA3520 20 Volt WA3520 WG151s WG155s WG251s WG255s WG540s WG545s WG890 WG891 Cordless Tool Battery (2 Packs)

What It Is

This is a 20V 3.5Ah lithium-ion battery replacement pack (2 batteries included) designed to power Worx cordless lawn mowers and outdoor tools that use the WA3525, WA3578, WA3575, or WA3520 battery platform.

Fitment & Compatibility

• Check your tool model: Compatible with Worx mowers like WG251s, WG255s, WG540s, WG545s, WG890, WG891, and trimmers/blowers WG151s, WG155s. Also works with most Worx 20V tools using the same slide-on battery interface.
• OEM vs aftermarket: This is a third-party replacement, not Worx-branded. It fits the same battery slot and uses the same charging port as genuine WA-series batteries.
• Physical dimensions: Approximately 4.5 x 3 x 2.5 inches per battery. Measure your tool’s battery compartment to ensure clearance—some tight-fitting models may require the original Worx battery for a perfect snap-in.
• Charger compatibility: Works with any Worx 20V charger (including the original WA3730 or WA3740). Do not use with 40V or 12V chargers.

Key Things to Know

• Capacity: 3.5Ah is a mid-range option—good for 30–45 minutes of mowing on a small lawn (under ¼ acre) or longer runtime for trimmers/blowers. Expect slightly less runtime than genuine 4.0Ah Worx batteries.
• Installation: No tools required. Slide battery onto tool until it clicks. Remove by pressing the release tab. Takes 10 seconds.
• Quality note: 4.0/5 stars from 144 reviews—most users report consistent performance, but a few note shorter lifespan than OEM (1–2 seasons vs 3+). Check return policy before buying.
• Common gotcha: These batteries may not fit Worx tools with a built-in battery cover or those requiring a specific latch shape (e.g., some older WG models). Test fitment immediately.

Should You Buy It

If you need a budget-friendly spare or backup set for light-to-moderate yard work (small lawns, trimmers, blowers) and don’t mind trading some longevity for half the price of OEM, this 2-pack is a solid value. Avoid if you have a large property, need maximum runtime, or require guaranteed OEM compatibility for tight-fit tools.