DEWALT 12V MAX 5Ah Battery, Lithium-Ion, 2-Pack (DCB126-2)

What It Is

This is a 2-pack of DEWALT 12V MAX 5Ah lithium-ion batteries (DCB126-2) designed to power DEWALT 12V MAX cordless lawn mowers, trimmers, edgers, and blowers. The 5Ah capacity provides extended runtime for medium-to-large yards.

Fitment & Compatibility

• Brand compatibility: Works exclusively with DEWALT 12V MAX tools and chargers (not 20V MAX or 60V FLEXVOLT systems).
• Physical check: Measure battery compartment dimensions (approx. 4.3” x 2.6” x 2.0”) to ensure it fits your mower’s slot. Some older 12V MAX mowers may have slightly narrower trays.
• Charger requirement: Requires a DEWALT 12V MAX charger (sold separately; does not include charger). The DCB115 or DCB107 chargers work, but the DCB118 will not charge 12V batteries.
• OEM vs aftermarket: This is genuine DEWALT OEM—aftermarket knockoffs often have lower capacity and no warranty.
• Mower model examples: Compatible with DEWALT DCMW220, DCMW225, DCMW230, and DCMW240 mowers. Verify your mower’s manual lists “DCB126” as compatible.

Key Things to Know

• Runtime: 5Ah gives roughly 45–60 minutes of continuous mowing on a 20” deck (varies by grass height and speed). Expect 20–30% less runtime in cold weather.
• Installation: Slide battery into mower until it clicks—no tools required. Remove for charging (do not charge in mower).
• Common gotcha: Batteries may not fit if your mower has a raised battery tray lip. Test one battery before buying the 2-pack.
• Warranty: DEWALT 3-year limited warranty against defects. Register online to activate.

Should You Buy It

If you own a DEWALT 12V MAX mower and need reliable, long-lasting power for larger lawns, this 2-pack is a solid investment. It’s overkill if your mower is older than 5 years or you only have a small yard—a single 5Ah or a 2Ah battery may suffice. Skip it if you don’t already own a 12V MAX charger.