DEWALT DCB126 12V MAX* 5.0Ah Lithium Ion Battery

What It Is

The DEWALT DCB126 is a 12V MAX* 5.0Ah lithium-ion battery designed to power DEWALT 12V MAX* tools and select outdoor equipment, including some 12V lawn mowers and trimmers. It provides higher runtime than standard 1.5Ah or 2.0Ah packs, making it suitable for longer yard work sessions without frequent swaps.

Fitment & Compatibility

• Tool/Equipment Fit: This battery fits all DEWALT 12V MAX* tools and chargers (e.g., DCB120, DCB115, DCB101). It does not work with 20V MAX* or 60V FLEXVOLT systems—check your tool’s voltage rating.
• Mower Specifics: Only compatible with select DEWALT 12V MAX* mowers (e.g., DCMW220, DCMW225) and string trimmers (e.g., DCMT214, DCMT215). Confirm your model’s voltage requirement—most DEWALT mowers use 20V or 40V.
• OEM vs Aftermarket: This is an OEM DEWALT battery, not a third-party alternative. It guarantees proper fit, charge cycles, and safety certification.
• Physical Dimensions: Measures approximately 4.5” x 2.5” x 2.5” and weighs ~0.5 lbs. Ensure your tool’s battery compartment can accommodate the 5.0Ah pack’s height (slightly taller than 2.0Ah units).
• What to Check Before Buying: Verify your tool’s voltage (12V MAX* only), model number, and battery slot depth. If your mower uses a slide-pack design, this battery is compatible; if it uses a post-terminal design, it will not fit.

Key Things to Know

• Installation Difficulty: Trivial—slides onto any 12V MAX* tool or charger. No tools required.
• Runtime: 5.0Ah provides roughly 2.5x the runtime of a standard 1.5Ah pack. For a 12V mower, expect 20–30 minutes of continuous cutting per charge (varies by grass density).
• Charging Time: Fully charges in about 60 minutes with a DEWALT DCB120 charger; older chargers may take longer.
• Common Gotchas:
  • Not compatible with 20V or 40V equipment—double-check your mower’s voltage label.
  • The 5.0Ah pack is bulkier than lower-capacity options; ensure your tool’s battery bay has enough clearance.
  • Store in a cool, dry place to maximize lifespan—extreme heat or cold degrades lithium-ion cells.

Should You Buy It

Buy this if you already own DEWALT 12V MAX* tools and want extended run time for trimming or light mowing without switching batteries. It’s ideal for small yards or as a spare for longer sessions. Skip it if your mower uses 20V or 40V, or if you only need occasional power—a lower-capacity 12V pack may suffice.