Mighty Max Battery ML-U1R-CCA 12V 200CCA Replacement Battery Compatible with Murray Ohio 40708 Riding U1R Lawn Mower and Tractor

What It Is

The Mighty Max Battery ML-U1R-CCA is a 12-volt, 200 cold-cranking-amp (CCA) replacement battery designed for riding lawn mowers and tractors that require a U1R group size battery. It provides the starting power needed for small engines in residential mowers, garden tractors, and some zero-turn models.

Fitment & Compatibility

Before buying, verify your mower’s battery group size—this is a U1R (U1 reversed terminal layout). Check your owner’s manual or existing battery for the group number. It fits the Murray Ohio 40708 and many other Murray riding mowers, but also works with many brands (Craftsman, Husqvarna, John Deere, etc.) that use a U1R. Measure your battery tray: U1R dimensions are roughly 7.7” L x 5.1” W x 6.2” H. Ensure the positive and negative terminals are on the correct sides (positive right, negative left when facing the terminals). This is a sealed AGM battery—no water refill needed—so it’s safe for tight compartments.

Key Things to Know

• Quality: 200 CCA is adequate for most single-cylinder mower engines (typically 10-20 hp). For larger twin-cylinder or commercial mowers, you may need a higher CCA (e.g., 300+). This is a budget-friendly AGM, not a high-end Odyssey or Yuasa.
• Installation: Simple swap—disconnect old battery (negative first), remove hold-down, replace, reconnect (positive first). No need to add electrolyte; it’s ready to use out of the box. Expect 2-3 year life with proper charging.
• Gotchas: Double-check terminal orientation—U1R is reversed from standard U1. If your mower uses a U1 (positive left), this won’t fit without modifying cables. Also, if your mower has a side-post or other connector type, you may need adapter posts (not included).
• Charging: AGM batteries charge at a lower voltage than flooded lead-acid. If you use a standard charger, ensure it has an AGM mode or a float voltage below 14.4V to avoid overcharging.

Should You Buy It

If you need a reliable, low-maintenance U1R replacement for a residential riding mower and don’t want to spend $100+ on premium brands, this is a solid value. It’s best for Murray, Craftsman, or similar models with small engines and standard U1R trays. Avoid if you need higher CCA for a twin-cylinder or commercial mower, or if your mower uses a U1 (non-reversed) terminal layout.