6.0Ah Replacement for Kobalt 40v Battery KB240-06 KB2540C-06 KB240-03 KB440-03 KB640-03 KB640-06 KB245-06 KRC40-06 KB440C-06 KB340C-06, Compatible with Kobalt 40 Volt Max Cordless Power Tools&Chargers

What It Is

This is a 6.0Ah aftermarket replacement battery for Kobalt 40V Max cordless lawn mowers, trimmers, blowers, and other outdoor power tools. It’s designed to replace OEM batteries like KB240-06, KB2540C-06, KB240-03, and others listed, providing higher runtime than standard 2.0Ah or 4.0Ah packs.

Fitment & Compatibility

• Voltage & Platform: Works only with Kobalt 40V Max tools and chargers. Not compatible with 24V, 80V, or other voltage systems.
• OEM Models Replaced: KB240-06, KB2540C-06, KB240-03, KB440-03, KB640-03, KB640-06, KB245-06, KRC40-06, KB440C-06, KB340C-06.
• Physical Check: Measure your existing battery’s dimensions (approx. 5.5” x 3.5” x 4.5”) and compare to this unit. Ensure the slide-in mounting rails and terminal orientation match.
• Charger Compatibility: Works with all Kobalt 40V chargers (e.g., KRC40-06, KRC40-03). No adapter needed, but some aftermarket packs may charge slower on older chargers.
• Deck/Tool Fit: Fits most Kobalt 40V mowers (e.g., KM2040, KM2540) and handheld tools, but verify clearance on compact blowers or trimmers—6.0Ah is taller than 2.0Ah packs.

Key Things to Know

• Runtime vs. Weight: 6.0Ah offers ~50% more runtime than a 4.0Ah, but weighs about 1.5 lbs more. Heavier on handheld tools.
• Aftermarket Quality: Not OEM; cells and BMS may have lower cycle life. Some users report reduced performance in cold weather or after 1-2 seasons.
• Installation: Drop-in replacement—no wiring or modifications needed. Ensure battery clicks fully into tool/charger.
• Common Gotcha: If your Kobalt tool has a “fuel gauge” button, this battery’s indicator may not match OEM accuracy. Test charge level before heavy use.

Should You Buy It

If you need a budget-friendly, high-capacity battery for a Kobalt 40V mower or stationary tool where weight isn’t critical, this is a solid value. Skip it for handheld tools (trimmers, blowers) where extra weight fatigues you, or if you want OEM reliability for heavy commercial use.