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Nigel Calder advises that standard automotive battery testers fail to accurately assess marine house batteries because they are designed for cranking duty cycles rather than deep-cycle discharge.0:48 To determine the true health of a house battery, perform a full capacity test by first charging the battery to 100%, then discharging it at a controlled rate while measuring the time taken to reach a specific voltage.1:16 If the remaining capacity falls below 80%, the battery is likely nearing the end of its service life.1:40 Calder recommends conducting this test every two years and emphasizes testing even brand-new batteries, as they may have suffered from sulfation while sitting on a retailer's shelf for years.1:55 Retailers often rely on inaccurate, quick-read meters that do not reflect the actual capacity of deep-cycle units.2:53 Verifying the manufacturing date code before purchase helps avoid buying aged stock.2:15 A full capacity test provides the only reliable metric for determining if a battery bank can support a planned cruise.0:38

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