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Deep discharge (battery), in the boat insurance glossary
Boat insurance term, area: Exclusions
A battery is deeply discharged when its voltage falls below the cut-off voltage, the limit down to which it may be discharged. In lithium batteries this can damage cells permanently, and a damaged pack can become a fire risk when it is next charged. The classic setting is winter lay-up: the boat stands for months while small consumers and self-discharge drain the pack. Wordings for electric and hybrid boats therefore commonly require regular, proper recharging and exclude damage caused by deep discharge, sometimes including a resulting fire.
What to check: Does your wording exclude damage from deep discharge, and does that exclusion extend to a fire that results from it? What does it require of you during lay-up: a charging interval, a battery management system, a written record?
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A general explanation in our own words.
What applies to you is set only by the wording of your own policy.
