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Old 01-10-2008
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Most of the boats with Shore Power cables running are running the chargers, fridges etc...whatever appliances are hooked in.

As for your battery questions - if it reads 10.4V AFTER it is charged - then you have no holding charge and a dead battery (which will be evident when you try to turn over your motor if it is an inboard.

Typically, if you leave the charger on - as a battery will self discharge left unattended - you'll be ok until the battery just dies. Typical battery life however for a marine battery is only about 2 years however (at least that is the average).

I live in Seattle as well - and as of late we have had freezing temps and that can kill a battery if a charger is not running on it. Marine batteries are not really designed for freezing temps..

I would see if your Guest Charger has a equalize function and reset however...


But - if you are reading 13.4 after charging you should be fine. If after charging it is 10 something or the charger just seems to charge continuously...its time to replace.
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