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Charge a Boat Battery
Identify the chemistry, choose a compatible charger and connect safely.
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Test With a Multimeter
Measure resting voltage and understand when a load test is still needed.
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Battery Lifespan
Learn what shortens service life and which warning signs matter.
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Battery Keeps Dying
Diagnose age, charging, connections and parasitic draw in the right order.
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Runtime Calculator
Estimate usable runtime from amp-hour capacity and load.
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Solar Planner
Turn daily energy use into a first-pass solar estimate.
Battery basics that prevent most surprises
- Use a battery designed for the required starting or deep-cycle job.
- Secure batteries and protect terminals from accidental contact.
- Keep connections clean, tight and suitable for the marine environment.
- Use a charger and profile compatible with the battery chemistry.
- Do not treat a calculator estimate as the safe maximum for a real trip.
Marine electrical work can create fire, shock and explosion hazards. Disconnect power correctly and use a qualified marine electrician when uncertain.