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post #11 of 15 Old 02-12-2013
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Re: Leaving Dead battery on shore power charger

I thought the newer battery chargers would stop charging when full. Is that true? I realize the battery is dead. Is there an automatic shutoff on the newer battery chargers when resistance is high?
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post #12 of 15 Old 02-12-2013
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Re: Leaving Dead battery on shore power charger

You can't presume anything about the newer "smart" chargers. Many will not turn on if the battery is below 10.5 volts, or a similar value. The only way to be sure of how your charger works, is to check the manual for your charger.
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post #13 of 15 Old 02-12-2013
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Re: Leaving Dead battery on shore power charger

Yes, a good mantra to go through life in this highly tecnological age:
When in doubt, read the instructions.

And a good truism to combat complacency:
Assumption is the mother of all #%@k-ups.

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post #14 of 15 Old 02-12-2013
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Re: Leaving Dead battery on shore power charger

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Originally Posted by jobberone View Post
I thought the newer battery chargers would stop charging when full. Is that true? I realize the battery is dead. Is there an automatic shutoff on the newer battery chargers when resistance is high?

Some dumb chargers turn off but most of the "smarter" ones don't turn off they simply maintain a voltage. It requires current to maintain a float voltage so most of them just stay on at a very, very low current.. Some are not as accurate as others and "pulse" the power supply on/off so as not to over shoot the voltage and others have the ability to pump out 0.1A for weeks on end if needed.

As for the OP I would not advise leaving a dead battery on-charge unattended.

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Last edited by Maine Sail; 02-12-2013 at 06:08 PM.
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post #15 of 15 Old 02-13-2013
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Re: Leaving Dead battery on shore power charger

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Originally Posted by Rockter View Post
A dead battery has a low internal resistance, and if it is truly dead, likely to stay with a low resistance. If so, it will stay warm on charging, it will have a high current draw, and just boil off the electrolyte.
I would not leave it unattended long-term.
Stay with it the first day and night, and check it for temperature and current draw.
If it seems to be tolerating it, it will probably be OK.
Personally, I don't use shore chargers. I have never liked the idea of the electrical system being live while unattended.
So you dont beleive in plugging in electric cars to charge when inattended?


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