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A battery monitor does not directly measure battery state — it counts amp-hour transactions in and out of the bank, applies weighting factors, and estimates remaining capacity based on the bank size entered at setup.▶ 1:02 Jeff Cote of Pacific Yacht Systems explains why this architecture causes the monitor to drift out of sync with actual battery condition over time.▶ 2:02 The core problem: the monitor always assumes the battery bank retains its original rated capacity.▶ 1:43 A four-golf-cart-battery 12-volt bank rated at 400 amp-hours at installation will age to a fraction of that capacity, but the monitor keeps calculating against 400 amp-hours unless the user updates the setting.▶ 1:54 The result is a readout showing 80% full while resting voltage sits at 11.7 volts — a contradiction that looks like a lie but is actually the monitor running on stale data.▶ 2:32 Voltage alone is also unreliable as a capacity gauge: it only reflects true state of charge after 24 hours with no charge or discharge, a condition rarely met on a working boat.▶ 2:55 Two other common misconfiguration errors are failing to update bank capacity when replacing batteries and failing to enter the correct battery chemistry — flooded lead-acid, AGM, or other — which affects the weighting applied to each transaction.▶ 3:36

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