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Eight-year-old AGM batteries that remain in good condition do not require immediate replacement, provided they have not suffered deep discharges.0:35 Nigel Calder notes that batteries kept on a mooring and maintained with proper solar charging algorithms often function as standby units, potentially lasting 15 to 20 years.1:06 While coastal cruisers can continue using these aging batteries until performance degrades, those planning extended offshore passages should perform a full capacity test or replace the bank to avoid failure.1:45 Quality lead-acid or gel batteries, such as the Victron units Calder previously used, should consistently last between five and ten years when discharged no more than 30 to 40 percent.2:45 Frequent premature battery failure indicates an underlying issue with the boat's electrical system or charging regimen.2:35 Investing in optimized charging equipment and additional solar capacity typically pays for itself by significantly extending the lifespan of the battery bank.Watch

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