Mighty Max Battery 12V 35Ah Battery Replaces John Deere Lawn Tractor-Riding Mower 108 Brand Product

What It Is

The Mighty Max Battery 12V 35Ah is a sealed lead-acid (AGM) replacement battery designed for lawn tractors and riding mowers, including John Deere 100-series models. It powers the starter motor and electrical system (lights, PTO, etc.) for gas-powered mowers.

Fitment & Compatibility

Before buying, verify these three things:

• Group size & dimensions: This battery measures approximately 7.7" L x 5.1" W x 6.2" H. Measure your battery tray to ensure it fits—common issues are width or height clearance under the seat or hood.
• Terminal layout: It uses SAE automotive-style posts (top posts). Check that your mower’s cables reach and the positive/negative terminals align with your existing wiring orientation. Some John Deere models use side-post or different terminal spacing.
• OEM vs. aftermarket: This replaces John Deere OEM battery part numbers like AM137330, AM137331, or AM137332, but it is not a John Deere product. It fits many 100-series (D100–D170), X300-series, and select LA-model tractors, but always cross-reference your model number with Mighty Max’s fitment list.

Key Things to Know

• AGM technology: This is a maintenance-free, spill-proof battery. No need to add water or check electrolyte levels. It also handles vibration better than flooded batteries.
• CCA rating: It delivers 270 cold cranking amps—sufficient for most single-cylinder and small V-twin engines down to about 20°F. For extreme cold or larger engines, consider a higher-CCA battery.
• Installation: Simple swap—disconnect negative first, then positive, remove hold-down, reverse for install. No special tools needed. Charge fully before first use (it ships at about 80% charge).
• Common gotcha: The terminal posts are slightly smaller than some OEM John Deere terminals. If your cables have a wide clamp, you may need a terminal adapter or shim for a tight connection.

Should You Buy It

Buy this if you need a reliable, low-maintenance replacement for a standard riding mower battery and want to save 30–50% vs. a John Deere-branded battery. It’s best for mild climates and seasonal use. Skip it if you mow in sub-freezing temps frequently or need a higher CCA for a large twin-cylinder engine—look for a 40Ah or higher model instead.