DEWALT 20V MAX Battery XR POWERPACK™ 4Ah Lithium Ion, 50% More Power, Dewalt Battery Compatible with 20V MAX Tools (DCB2104)

What It Is

The DEWALT DCB2104 is a 20V MAX 4Ah lithium-ion battery designed to power DEWALT 20V MAX cordless lawn mowers, string trimmers, blowers, and hedge trimmers. It offers 50% more power than standard 2Ah packs, extending runtime for medium-duty yard work.

Fitment & Compatibility

• Voltage & Platform: Only works with DEWALT 20V MAX tools—not 40V, 60V, or FlexVolt systems. Check tool label for “20V MAX” logo.
• Physical Fit: The DCB2104 uses the standard slide-on tab design. It fits all DEWALT 20V MAX mowers (e.g., DCMW220, DCMW225) and outdoor tools, but note the larger 4Ah size may feel slightly bulkier on compact trimmers.
• OEM vs. Aftermarket: This is an OEM DEWALT battery. Aftermarket batteries may fit but often lack the same charge control and cell quality.
• Check Before Buying: Confirm your mower or tool is 20V MAX (not 18V NiCd or 40V). Measure battery compartment depth if using on a mower—some older models have tight slots that only accept 2Ah packs.

Key Things to Know

• Quality: Genuine DEWALT cells with internal LED fuel gauge and over-discharge protection. Reliable for 3+ years with proper care.
• Installation: Slide on until it clicks—no tools needed. Avoid forcing into tight compartments.
• Gotchas: Not compatible with 18V tools or chargers. Charge only with DEWALT 20V chargers (DCB101, DCB107, etc.). For mowers, runtime is ~30-45 minutes on a 20-inch deck; have a second battery for larger lawns.
• Performance: 4Ah provides good balance of weight (1.2 lbs) and runtime—heavier than 2Ah but lighter than 6Ah packs.

Should You Buy It

Best for homeowners with DEWALT 20V MAX mowers or outdoor tools who need reliable, OEM runtime without the bulk or cost of a 6Ah pack. Skip if you own 40V or 60V tools—this battery won’t work.