Replacement Kobalt 40V Battery 5.0Ah 1 Pack for KB-540-06/KB440-06/KB240-06 Series | 40V MAX Lithium-Ion Battery | Compatible with 40v Kobalt Cordless Power Tools | Fast Charging & Extended Runtime

What It Is

This is a genuine Kobalt 40V 5.0Ah lithium-ion battery pack designed as a replacement or spare for 40V Kobalt cordless lawn mowers and outdoor power tools. It provides extended runtime for mowing, trimming, leaf blowing, and other yard tasks.

Fitment & Compatibility

• Exact Fit: Works with Kobalt 40V tools that accept the standard Kobalt 40V slide-on battery interface (e.g., KB-540-06, KB440-06, KB240-06 mowers; also compatible with trimmers, blowers, chainsaws, etc.).
• Check Model Number: Verify your tool’s model number (on the tool or manual) matches the KB-540-06/KB440-06/KB240-06 series. This battery is not compatible with older 24V or 80V Kobalt systems.
• Physical Fit: Measures approximately 5.5” x 4” x 3.5”. Ensure your tool’s battery compartment has clearance for this size.
• OEM vs Aftermarket: This is a genuine Kobalt battery, not a third-party knockoff. It will charge reliably with any Kobalt 40V charger (sold separately).

Key Things to Know

• Installation: Tool-free, slides onto battery post until it clicks. No wiring or tools needed.
• Runtime: 5.0Ah provides roughly 30–45 minutes of continuous mowing on a standard 20” deck (varies by load and grass conditions).
• Charging: Uses standard Kobalt 40V charger; full charge takes about 90 minutes. Do not mix with aftermarket chargers.
• Gotcha: If your tool is older than 2018, check that the battery latch tabs align with your tool’s release mechanism. Some early models used a slightly different tab shape.

Should You Buy It

Buy this if you own a compatible Kobalt 40V mower or tool and need a spare battery for longer jobs, or if your original battery has degraded. It’s a direct OEM replacement with solid runtime and fast charging—ideal for homeowners with a single battery who want to avoid downtime. Skip it if you need a battery for a different voltage system or if your tool is from a non-Kobalt brand.