Mighty Max Battery

About Mighty Max Battery

Mighty Max Battery offers sealed lead-acid (AGM and gel) and lithium iron phosphate (LiFePO4) batteries in common sizes for mobility, solar, marine/RV, security, and backup power. These maintenance-free batteries are spill-proof, vibration-resistant, and available in deep-cycle and standby variants for dependable performance.

Battery chemistries at a glance

When to choose each type

Choose AGM if

• You need a budget-friendly, maintenance-free replacement for UPS, alarm, or mobility devices.
• Your charger supports AGM/lead-acid profiles with float mode.
• Weight and cycle life are less critical than cost and compatibility.

Choose Gel if

• You require deeper cycling than AGM with good heat tolerance.
• Your charger has a gel setting (lower voltage, slower charge).
• Systems run in warm cabinets or enclosures (reduced gassing).

Choose LiFePO4 if

• You want long cycle life, fast charging, and major weight savings.
• You can use a LiFePO4-compatible charger or adjustable charger.
• Applications include RV house banks, marine trolling, off-grid solar, or high daily cycling.

Avoid LiFePO4 if the system will be charged below 32°F (0°C) without low-temp protection, or if the alternator/inverter-charger cannot be configured to lithium settings.

Sizing and compatibility

• Footprint: Offered in common BCI group sizes (e.g., Group U1, 24, 27, 31) and small SLA sizes (e.g., 12V 7Ah, 12V 35Ah) for drop-in replacement.
• Terminals: Verify type before ordering: F1 (0.187 in) or F2 (0.250 in) spade, M5/M6/M8 threaded, or bolt terminals.
• Voltage and wiring: Many mobility and solar systems use 12V batteries in series (24V/36V/48V). Replace in matched sets (same capacity, age, and chemistry).
• Capacity match: For lead-acid, choose 20‑hour (C20) Ah similar to the original. For lithium upgrades, match usable watt-hours, not just Ah.
• Starting vs deep-cycle: Most Mighty Max models are deep-cycle/standby. Use only models specified for engine starting if cranking amps are required.

Charging and maintenance

• Use the right profile: AGM and gel require different voltages; gel needs slightly lower bulk/absorption. Lithium needs a LiFePO4 profile (no long-term float).
• Temperature matters: Reduce charge voltage roughly 0.03V per cell per °C above 25°C (77°F) for lead-acid. Do not charge LiFePO4 below 32°F (0°C) unless the battery has low-temp protection.
• Storage: Store fully charged. Top off lead-acid every 3–6 months; lithium every 6–12 months. Disconnect parasitic loads.
• Connections: Use appropriately sized cables; torque to spec; protect with fuses/breakers close to the battery.

Quick runtime estimate

Runtime (hours) ≈ Usable Wh ÷ Load (W). Usable Wh ≈ Voltage × Ah × allowable depth-of-discharge.

Example (mobility scooter): Two 12V 35Ah AGM in series = 24V × 35Ah = ~840Wh. At 300W average draw and 50% usable DoD, runtime ≈ (840 × 0.5) ÷ 300 ≈ 1.4 hours. Lithium (80–90% usable) of similar Wh would extend runtime.

Installation checklist

• Confirm size, terminal type, and polarity match your tray and cables.
• Charge new batteries to full before first use.
• Secure batteries to limit vibration; add ventilation for lead-acid enclosures.
• Set charger/inverter to the correct chemistry and voltage limits.
• For multi-battery banks, use identical models and balance cable lengths.
• Label install date; keep the purchase receipt for warranty.

Safety and recycling

• Avoid short circuits; remove metal jewelry when working on terminals.
• Lead-acid batteries are recyclable; return cores to a local recycler.
• Follow manufacturer guidance for lithium transport and disposal.

FAQ

Are Mighty Max batteries maintenance-free?

Yes. AGM, gel, and LiFePO4 models are sealed and do not require watering. Periodic inspection for clean, tight terminals is recommended.

Can I replace AGM with LiFePO4?

Often, yes. Match voltage and capacity (Wh) and ensure your charger supports LiFePO4 settings. Check for low-temperature charging limits and install proper fusing.

Do these batteries work in cold weather?

AGM/gel discharge reliably in the cold (with reduced capacity). LiFePO4 should not be charged below 32°F (0°C) unless equipped with low-temp protection; discharge is typically fine down to about -4°F (-20°C).

How long do they last?

Typical cycle life varies: AGM ~300–600 cycles, gel ~500–700, and LiFePO4 ~2000–4000, depending on depth of discharge, temperature, and charging practices.

What warranty is offered?

Warranty terms vary by model and application. Keep your receipt and refer to the product listing for specific coverage and claim steps.