Replacement for Dewalt 12V Battery DCB120 4.0Ah - Replacement for DCB120, DCB121, DCB127 DCB124 - Lithium-Ion Rechargeable Batteries for Dewalt 12volt Cordless Tools 2-Pack

What It Is

This is a 12V lithium-ion battery pack (4.0Ah, 2-pack) designed to power Dewalt 12V cordless tools, including lawn mowers, trimmers, blowers, and edgers that use the Dewalt 12V MAX* platform. It replaces OEM models DCB120, DCB121, DCB127, and DCB124.

Fitment & Compatibility

Before buying, confirm your tool uses the Dewalt 12V MAX* battery platform (not 20V/60V). Check the battery bay shape: these have the standard Dewalt slide-on interface with a single release button. They are not compatible with Dewalt 18V NiCad or 20V MAX* tools. For mowers, verify the battery compartment depth—some compact mowers may require a slightly shorter battery. Measure your OEM battery’s length (approx. 4.5 inches) and ensure the replacement matches. If your charger is Dewalt 12V (DCB115 or similar), these will charge fine.

Key Things to Know

• Aftermarket vs. OEM: These are not genuine Dewalt; they are third-party replacements. Performance and lifespan may be lower than OEM, especially in cold weather or under heavy load.
• Installation: Drop-in fit—no wiring or modifications needed. Just slide in until it clicks.
• Common gotcha: Some users report the battery doesn’t sit as snugly as OEM, which can cause intermittent power loss on vibrating tools (e.g., trimmers). Check the fit before using.
• Charging: Use only a Dewalt 12V charger. Do not attempt to charge on a 20V or 18V charger—risk of damage or fire.

Should You Buy It

If you need a budget-friendly spare or second set for light-duty lawn tools (e.g., small trimmers or blowers), this 2-pack offers decent value. But for heavy or daily use on a mower, stick with genuine Dewalt for better reliability, runtime, and warranty support.