DTK Replacement for Kobalt 40V Battery 6000mAh KPM1040A-03, KM-1640-06, KM 4040-06, Cordless Power Tool Batteries 2 Packs

What It Is

This is an aftermarket 40V 6.0Ah lithium-ion battery pack designed to power Kobalt 40V cordless lawn mowers, string trimmers, blowers, and other 40V outdoor tools. It’s sold as a 2-pack replacement for the original Kobalt KPM1040A-03 battery.

Fitment & Compatibility

Check these before buying:

• Voltage & platform: Only for Kobalt 40V tools (not 80V or 24V).
• Model numbers confirmed compatible: KPM1040A-03, KM-1640-06, KM 4040-06. Also fits many Kobalt 40V mowers (e.g., KM2040-06, KM2040-03) and other 40V tools.
• Physical dimensions: Same footprint as OEM Kobalt 40V batteries – about 5.5" x 3.5" x 3". Measures to ensure it fits your tool’s battery compartment.
• Connector type: Standard Kobalt 40V slide-on terminal. Works with all Kobalt 40V chargers (original and aftermarket).
• Not compatible: Do not use in 80V or 24V Kobalt tools, or in other brand 40V tools (e.g., Greenworks, Ryobi).

Key Things to Know

• Capacity vs OEM: 6.0Ah is higher than the standard 4.0Ah or 5.0Ah OEM packs – gives longer runtime per charge. The 2-pack effectively doubles your work time.
• Quality variance: Aftermarket batteries may have slightly lower cycle life than OEM. Check reviews for reports of premature failure or swelling after heavy use.
• Installation: No tools needed. Slide in until it clicks, press release tab to remove. Works with existing Kobalt charger.
• Common gotcha: Some users report the charge indicator LEDs are less accurate than OEM. Let the battery fully charge before first use.

Should You Buy It

If you own multiple 40V Kobalt tools and need extended runtime without buying expensive OEM packs, this 2-pack is a solid value. It’s ideal for homeowners with medium-to-large lawns who want backup power for mowing, trimming, and blowing. Avoid if you rely on heavy daily professional use – OEM packs may offer better longevity.