DEWALT 20V MAX Battery, Premium 4.0Ah (DCB204)

What It Is

The DEWALT DCB204 is a 20V MAX Premium 4.0Ah lithium-ion battery designed to power DEWALT 20V MAX cordless lawn mowers, trimmers, blowers, and other outdoor power equipment. It provides longer runtime than the standard 2.0Ah battery, making it suitable for medium-sized yards and heavier-duty tasks.

Fitment & Compatibility

• Brand fit: Works only with DEWALT 20V MAX tools and chargers (not compatible with 18V NiCad or 60V FLEXVOLT systems without adapter).
• Mower models: Fits DEWALT cordless mowers like DCMW220, DCMW564, DCMW242, and DCMW222. Check your mower’s battery slot—it must accept the slide-pack design (not the older post-style).
• Other tools: Compatible with DEWALT 20V MAX trimmers (e.g., DCST920), blowers (DCBL720), and edgers.
• OEM vs aftermarket: This is an OEM battery—expect perfect fit and performance. Aftermarket batteries may save money but often lack consistent power delivery and safety circuits.
• Measurements: 4.9 x 3.2 x 2.6 inches, 0.8 lbs. Ensure your tool’s battery compartment has clearance for this size (some compact tools may be tight).

Key Things to Know

• Quality: Premium 4.0Ah cells provide reliable power, but this is not the highest capacity—consider 5.0Ah or 6.0Ah for larger yards.
• Installation: Slide onto tool until it clicks; no tools needed. Remove by pressing the release button.
• Common gotcha: The DCB204 uses older cell technology (not the newer 21700 cells in the DCB205 or DCB206). It runs cooler but has slightly less runtime per weight.
• Charger compatibility: Works with all DEWALT 20V chargers (DCB101, DCB102, DCB103, DCB104, etc.). Charging time is ~60 minutes with a standard charger.

Should You Buy It

Buy this if you own DEWALT 20V MAX equipment and need a reliable, mid-range battery for routine mowing and trimming on up to 1/4 acre. It’s a solid upgrade from the 2.0Ah for longer runtime without the cost of the 5.0Ah. Skip if you have a large yard (over 1/3 acre) or need maximum runtime—opt for the DCB205 or DCB206 instead.