Replacement AGM Battery; RGZ10S; 150+ CCA's; FOR MTD/TROY BILT PART NUMBER 725-17136

What It Is

This is a sealed, maintenance-free AGM (Absorbent Glass Mat) battery designed to start the engine on riding lawn mowers and zero-turn mowers. It directly replaces MTD and Troy-Bilt OEM part 725-17136, delivering 150+ Cold Cranking Amps (CCA) for reliable starts in cooler weather.

Fitment & Compatibility

Before buying, verify three things:

• OEM Part Match: Confirm your machine’s current battery is labeled 725-17136 or that this replacement is listed for your model. Cross-reference with your owner’s manual or existing battery.
• Physical Dimensions: The RGZ10S case is roughly 5.9” L x 3.4” W x 5.7” H. Measure your battery tray to ensure it fits snugly.
• Terminal Layout: This battery uses standard SAE posts (positive on left, negative on right when facing the terminals). Check that your cables reach without stretching or reversing polarity.
• Brand Fit: Works with most MTD, Troy-Bilt, Cub Cadet, and Yard Machines models that originally used a 725-17136 battery. Not for push mowers or small tractors requiring a smaller U1 battery.

Key Things to Know

• No Maintenance Needed: AGM is spill-proof and vibration-resistant—no need to add water or check electrolyte levels. Just install and go.
• Installation Difficulty: Easy (20-30 minutes). Remove the old battery, clean the tray and terminals, place the new one, and reconnect (positive first, then negative). Use a corrosion spray on terminals.
• CCA vs. Ah: At 150+ CCA, this is sufficient for most residential mowers. If you mow in sub-freezing temps or have a larger engine (20+ HP), consider a battery with 200+ CCA.
• Charging: Use a charger designed for AGM batteries (not a standard lead-acid charger) to avoid overcharging and shorten lifespan. A trickle charger is fine for storage.

Should You Buy It

This is a solid, budget-friendly replacement if your MTD/Troy-Bilt mower needs a 725-17136 battery and you want a maintenance-free, drop-in option. It’s ideal for homeowners with a single riding mower who prioritize simplicity and cold-weather starts over maximum cranking power. Skip it if you need a higher CCA for extreme cold or a different terminal layout.