Marine Battery Service Fort Myers, FL

Marine battery replacement in Fort Myers depends on battery type and bank size. AGM batteries (Lifeline, Optima, Odyssey) range from $250–$600 per battery installed. Lithium LiFePO4 batteries (Relion, Epoch, LiTime, Watt Cycle) range from $800–$3,500 per battery. Full bank replacements including wiring and programming typically run $1,500–$12,000. We provide a written estimate before any work begins. Call 239-323-9600 for a free consultation.

It depends on your usage pattern. Lithium LiFePO4 batteries last 3–5x longer than AGM (3,000–5,000 cycles vs 500–800), weigh 60% less, and provide consistent voltage until nearly depleted. They're ideal for liveaboards, cruisers, and boats with high electrical loads. AGM remains cost-effective for weekend boaters with modest power needs. We analyze your electrical load, usage pattern, and budget to recommend the right chemistry. Our battery calculator at accumarmarine.com/battery-calculator helps you compare options.

Common signs: (1) Slow engine cranking. (2) Lights dimming at anchor. (3) Battery won't hold charge overnight. (4) Swollen or corroded cases. (5) Battery is 3+ years old (AGM) or showing capacity loss on load test. We perform comprehensive battery bank testing including voltage under load, internal resistance measurement, and capacity testing. This tells you exactly which batteries need replacement vs. which are still serviceable.

For lithium LiFePO4: Relion, Watt Cycle, Epoch, and LiTime — all marine-grade with built-in BMS and drop-in compatibility. For AGM: Lifeline (made in USA, military-grade), Optima (BlueTop marine), Odyssey (thin-plate pure lead), and Interstate (reliable, widely available). We also install Victron Energy battery monitors and smart chargers for complete system integration.

Florida's heat accelerates battery degradation. AGM batteries typically last 2–4 years in SWFL (vs 4–6 in cooler climates). Lithium LiFePO4 batteries last 8–12 years regardless of climate, with built-in thermal management. Proper charging, ventilation, and regular testing extend battery life significantly. Our Battery & Electrical Maintenance Program includes twice-yearly testing and charging system verification.

Yes. We retrofit lithium battery systems on boats of all ages. The key considerations are: (1) Charging system compatibility — your alternator and shore charger must support lithium profiles. (2) BMS integration — we ensure the battery management system communicates with your existing electrical system. (3) Proper sizing — lithium banks are typically 50% smaller than equivalent AGM banks. We handle the complete conversion including charger reprogramming and monitoring setup.

Yes. Our battery diagnostic service ($200 minimum, includes full electrical system check) covers: individual battery voltage and internal resistance testing, load testing under real-world conditions, charging system output verification (alternator, shore charger, solar), parasitic draw measurement, and cable/connection inspection. You get a written report with specific recommendations. Most diagnostics are completed same-day.

We provide mobile marine battery service throughout Southwest Florida: Fort Myers, Cape Coral, Naples, Marco Island, Bonita Springs, Estero, Sanibel, Pine Island, Punta Gorda, Port Charlotte, and Sarasota. We come to your dock, marina, or boatyard with batteries and tools. Core service area is Lee and Collier County with no travel surcharge.