Mighty Max Battery ML-U1 200CCA Battery for Murray Ohio Mfg. Co. 12.5HP/40 Riding Mower

What It Is

The Mighty Max Battery ML-U1 is a 12-volt, 200 cold cranking amp (CCA) sealed lead-acid battery designed to replace the starting battery in a Murray 12.5HP/40-inch riding mower. It provides the power needed to crank the engine and runs the mower’s electrical system.

Fitment & Compatibility

Before buying, verify your mower’s battery tray dimensions: the ML-U1 measures approximately 7.7 x 5.2 x 6.2 inches. This fits many Murray 12.5HP/40-inch riding mowers, but check your specific model number (often on a sticker under the seat or on the frame). This is an aftermarket battery, not an OEM Murray part, so it will work as a direct replacement if your original battery is a U1 group size. Confirm the terminal orientation (positive on left or right) matches your cables, and that your existing hold-down bracket fits the case dimensions.

Key Things to Know

• No maintenance required – It’s AGM (absorbent glass mat), so no watering or acid refills; just charge and install.
• Installation is straightforward – Disconnect negative first, then positive, swap the battery, and reconnect positive first. Use a battery terminal cleaner if corrosion is present.
• Check your charger – AGM batteries need a compatible charger (usually a standard lead-acid charger works, but avoid high-amperage “fast” chargers unless they have an AGM setting).
• Cold cranking amps matter – 200 CCA is adequate for a 12.5HP engine in moderate climates, but if you mow in very cold weather (below freezing), you may want a higher CCA battery for reliable starts.

Should You Buy It

If you need a direct-fit, maintenance-free replacement for a standard U1 battery in your Murray 12.5HP/40-inch riding mower, this is a solid, affordable choice. It’s ideal for owners who want a simple swap without dealing with acid spills or watering. Skip it if your mower requires a different group size or if you need a higher CCA for extreme cold.