Mighty Max Battery ML-U1-CCAHR 12V 320CCA Battery for Toro Titan ZX5420 0Turn Lawn Mower

What It Is

The Mighty Max Battery ML-U1-CCAHR is a 12V, 320 cold-cranking-amp (CCA) sealed lead-acid battery designed to replace the starting battery in zero-turn mowers like the Toro Titan ZX5420. It powers the engine starter and runs electrical components such as lights and safety switches.

Fitment & Compatibility

• Direct fit for Toro Titan ZX5420: Yes, but only if your mower uses a U1 size battery (7.7" L x 5.1" W x 6.2" H). Check your current battery tray dimensions—this battery is slightly taller than some OEM options, so measure clearance under the seat or hood.
• OEM vs aftermarket: This is a generic replacement, not a Toro OEM part. It matches the specs of Toro part number 121-3089 or similar U1 group batteries.
• Terminal orientation: Positive terminal is on the left (when facing battery). Verify your cables reach without stretching—some Toro models have reversed terminals.
• What to check before buying: Measure your old battery’s height (especially if you have a tight compartment), confirm CCA rating (320CCA is sufficient for most 15-25hp engines), and ensure your mower uses a standard U1 group battery (not a U1R or U1L variant).

Key Things to Know

• Quality concerns: Rating at 3.2/5 suggests potential reliability issues—some users report shorter lifespan than OEM batteries (1–2 seasons vs 3–4). Check return policy before purchase.
• Installation difficulty: Easy—remove two bolts, disconnect cables (negative first), swap, reconnect, and secure. No special tools needed.
• Maintenance-free: Sealed AGM design means no water refilling, but it’s still sensitive to deep discharges—use a maintainer if storing over winter.
• Common gotcha: The terminal bolts may be metric (M6), while some Toro cable ends use SAE (5/16”). Have a 10mm or adjustable wrench ready.

Should You Buy It

Buy the Mighty Max ML-U1-CCAHR if you need a budget-friendly, quick replacement for a Toro Titan ZX5420 and are comfortable with a slightly lower lifespan than OEM. Skip it if you want guaranteed fitment and long-term durability—spend $15–20 more on a Toro-branded or reputable brand (e.g., Yuasa) battery for better reviews and peace of mind.