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Trojan Motive 24-AES 76Ah 12V AGM DT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Orlando, FL
Delivery on Dec 30 – Jan 05
Trojan Motive T-1275 150Ah 12V Flooded ELPT Deep-Cycle Battery with Master Vent
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
MK Battery DEKA 8G27-HFL-DEKA Gel Deep Cycle Lead-Acid Storage Battery 12V
Delivery on Dec 30 – Jan 05
Trojan Motive 27-AES 89Ah 12V AGM DT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
MK Battery DEKA 8G31-HST-DEKA Gel Deep Cycle Lead-Acid Storage Battery 12V
Delivery on Dec 30 – Jan 05
Trojan Solar SAES-12-105 107Ah 12V AGM LT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
Trojan Motive 31-AES 102Ah 12V AGM DT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
Trojan Motive 31-AES 102Ah 12V AGM M8 Deep-Cycle Battery
Pickup on Wed, Dec 24 from Orlando, FL
Delivery on Dec 30 – Jan 05
Trojan Solar SAES-12-135 134Ah 12V AGM LT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Tampa, FL
Delivery on Dec 30 – Jan 05
Trojan Motive T1275-AES 130Ah 12V AGM M8 Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
Trojan Motive J185-AES 175Ah 12V AGM DT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
Trojan Solar SAES-12-205 179Ah 12V AGM LT Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
Trojan Motive J185-AES 175Ah 12V AGM M8 Deep-Cycle Battery
Pickup on Wed, Dec 24 from Miami, FL
Delivery on Dec 30 – Jan 05
MK Battery DEKA 8A8D-LTP-DEKA AGM Lead-Acid Storage Battery 12V
Delivery on Dec 30 – Jan 05
MK Battery DEKA 8G8D-HLT-DEKA Gel Deep Cycle Lead-Acid Storage Battery 12V
Delivery on Dec 30 – Jan 05
Premature battery failure stems from application mismatch—pairing battery chemistry with duty cycles they weren't engineered to handle. This creates emergency replacements at 2x retail cost and operational downtime exceeding the battery's purchase price.
Advertised cycle life represents laboratory conditions. Real longevity depends on three variables: depth of discharge, charging voltage accuracy, and temperature. A battery rated for 500 cycles at 50% DoD delivers only 150 cycles at 80% DoD. Every 15°F above 77°F cuts lead-acid life in half. Lithium suffers permanent damage when charged below 32°F.
Flooded Advantages
Superior heat dissipation for high-current discharge, best cold-weather cranking below 0°F, 30% cheaper than AGM when maintenance aligns with existing service schedules.
AGM Advantages
Maintenance-free, withstands vibration 300% better than flooded, 40% faster charging for solar systems with variable windows.
Gel Cell Advantages
Tolerates 80% DoD across 500 cycles (AGM fails at 200 cycles), resists thermal runaway when charging voltage exceeds specifications.
Lithium Limitations
Permanent damage if charged below 32°F, requires $200-400 heating system for cold climates, delivers only 60-70% capacity at freezing temperatures.
Economic breakeven requires both frequent cycling and deep discharge. Cost per usable amp-hour-cycle determines value:
Cost Comparison per Usable Amp-Hour-Cycle:
Lithium: $1,200 ÷ (100Ah × 2500 cycles) = $0.0048
Lead-acid: $350 ÷ (50Ah × 400 cycles) = $0.0175
✅ Lithium Justifies Premium
Applications exceeding 200 annual cycles: full-time RVs, fishing guides, daily solar cycling.
✅ Lead-Acid Wins
Backup UPS cycling monthly (60 cycles over 5 years), seasonal boats/campers, vehicle starting where cycle count never reaches 400.
Lead-acid loses exponential cycle life below 50% state of charge. Size lead-acid at 2x maximum discharge; lithium at 1x discharge due to 100% usable depth.
💡 Example: 40Ah trolling motor consumption requires 80Ah AGM or 40Ah lithium for equivalent cycle life.
Sixty percent of premature failures trace to charging voltage errors under one volt. A $40 battery monitor showing real-time voltage prevents 90% of early deaths. The most expensive battery with a 13.8V charger fails faster than a budget battery with proper 14.4V charging.
— Battery University Research Team
CCA (Cold Cranking Amps)
Current at 0°F for 30 seconds—matters only for engine starting.
RC (Reserve Capacity)
Minutes at 25-amp discharge—indicates house-bank duration.
Ah (Amp-Hours)
Total capacity at 20-hour rate. Lead-acid delivers only 70% at high discharge rates (Peukert effect). Lithium maintains full capacity at any discharge rate.
Extreme cold (regular below 0°F), stationary installation with maintenance access, high-current discharge applications.
Vibration exposure (marine/off-road), maintenance-free requirement, solar with MPPT controller, under 200 annual cycles.
True deep-cycle need (80% DoD), basic charge controller without programmable profiles, budget constraint with cycling requirement.
Over 200 annual cycles, weight/space critical, high discharge rates, need 100% usable capacity—and can guarantee charging above 32°F or install heating.
Monitor actual discharge depth for 30 days before buying replacements. Forty percent of customers oversize by 2x for worst-case scenarios occurring once annually. Size for measured reality—a quality 100Ah battery outperforms a cheap 200Ah unit while costing 25% less.
— Interstate Batteries Technical Support
Battery selection requires calculating cost per usable amp-hour-cycle, not comparing sticker prices. A $1,500 lithium battery delivers excellent value above 200 annual cycles but wastes money in standby applications where $300 lead-acid provides identical utility. Match chemistry to actual duty cycle—not sales recommendations or conventional wisdom.
Need Help Choosing the Right 12V Battery?
Our battery specialists will help you select the perfect chemistry and capacity for your specific application—saving you money and preventing premature failure.
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