FSKE Upgraded 6500mAh Replacement for Kobalt 24V Battery KB624-03 KB524-03 KB424-03 - Compatible with Kobalt 24 Volt Max Power Tools 2Packs

What It Is

This is an upgraded 6500mAh aftermarket battery pack designed to replace the OEM Kobalt KB624-03, KB524-03, and KB424-03 24V batteries. It’s intended for use in Kobalt 24V Max cordless lawn mowers, trimmers, blowers, and other power tools that accept the Kobalt 24V Max battery platform.

Fitment & Compatibility

• Exact model replacements: KB624-03, KB524-03, KB424-03. If your original battery is one of these, this will physically click in and power the tool.
• Tool compatibility: Works with any Kobalt 24V Max tool, including push mowers (e.g., KM2040, KM2041), string trimmers, leaf blowers, and hedge trimmers. Does NOT work with 40V or 80V Kobalt tools.
• Physical check: Measure your battery compartment depth. The 6500mAh pack is slightly taller than the OEM 2Ah/4Ah packs. If your mower has a tight battery bay, measure first—some users report a snug fit.
• Charger compatibility: Works with any Kobalt 24V charger (e.g., KRC-24-06, KRC-24-04). No adapter needed.

Key Things to Know

• Capacity upgrade: 6500mAh (6.5Ah) significantly outlasts the OEM 2Ah or 4Ah packs—expect 50-100% more runtime per charge on a mower.
• Build quality: Aftermarket, not OEM. Some users report slightly looser fit or shorter lifespan than genuine Kobalt batteries. Check for swollen cells or overheating after heavy use.
• Installation: Zero difficulty—slide in until it clicks. No tools or modifications required.
• Common gotcha: The higher capacity means longer charge time (2-3 hours on a standard charger). Also, if your mower has a low-battery light, it may trigger earlier than with OEM packs due to voltage sensing differences.

Should You Buy It

Buy this if you need extended runtime for a Kobalt 24V mower or trimmer and don’t mind an aftermarket battery that may not last as many charge cycles as OEM. It’s a good budget-friendly upgrade for heavy users who want to avoid buying multiple smaller OEM packs. Skip it if you need guaranteed reliability, warranty support, or a perfect factory fit.