DEWALT 20V MAX* XR Battery, 4.0-Ah, 2-Pack (DCB204-2), Black

What It Is

The DEWALT DCB204-2 is a 2-pack of 20V MAX* XR 4.0-Ah lithium-ion batteries designed to power DEWALT 20V MAX* cordless lawn mowers, trimmers, blowers, and other outdoor power equipment. These batteries offer higher runtime than standard 2.0-Ah packs, making them suitable for medium-to-large yards.

Fitment & Compatibility

• Brand compatibility: Works only with DEWALT 20V MAX* tools and chargers. Not compatible with DEWALT 60V MAX* or FlexVolt systems unless using a 20V adapter.
• Physical fit: Dimensions are 5.1" x 3.0" x 2.4" (L x W x H). Fits all DEWALT 20V MAX* mowers (e.g., DCMW220, DCMW225) and string trimmers. Check battery compartment depth—some older mowers may have tight clearance.
• Charger compatibility: Works with all DEWALT 20V MAX* chargers (DCB115, DCB107, etc.). Does not include a charger.
• OEM vs. aftermarket: This is genuine DEWALT OEM. Avoid generic knockoffs—they often lack proper voltage regulation and may damage mower electronics.
• What to check before buying: Verify your mower model uses 20V MAX* batteries (not 60V or 40V). Also check if your mower requires two batteries to operate (some models need both slots filled).

Key Things to Know

• Installation: Tool-free—slides onto mower battery terminals until it clicks. No wiring or modification needed.
• Runtime: 4.0-Ah provides roughly 40–50 minutes of continuous mowing on a 20” deck (varies by grass thickness and speed). Expect 2–3 full mows per charge on a small lawn.
• Quality: XR cells offer better heat dissipation and longer cycle life than standard DCB200 batteries. 3-year limited warranty.
• Common gotcha: These batteries are heavier than 2.0-Ah packs (~1.3 lbs each). On a mower, the extra weight can improve traction but may make handheld tools feel unbalanced. Also, they do not have a fuel gauge—only a single LED for low battery warning.

Should You Buy It

Buy this 2-pack if you own a DEWALT 20V MAX* mower and need reliable runtime for a medium lawn (¼–½ acre) without stopping to recharge. It’s also ideal if you already have a DEWALT charger and want a genuine OEM upgrade over older or lower-capacity batteries. Skip it if you need batteries for 60V tools, have a tiny yard, or want a charger included.