Did I kill my battery? - SailNet Community
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post #1 of 13 Old 03-13-2013 Thread Starter
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Did I kill my battery?

Honey, did you turn the lights off? My reply was yes. The problem I discovered two days later was, no I had not turned the lights off. The battery was dead as hell. It did show 5.4 volts. I have it on the smart charger now. Do you think I kiilled it or will it recover? It is an AGM battery.
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post #2 of 13 Old 03-13-2013
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Re: Did I kill my battery?

Once should not kill it, if it's a relatively new battery. Take the time to charge it (smart charger should do that)... You may have taken some of the polish off of it but you should be fine.

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post #3 of 13 Old 03-13-2013 Thread Starter
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Re: Did I kill my battery?

Thanks for the reply. Hopefully it will recover. We'll see...
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post #4 of 13 Old 03-13-2013
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Re: Did I kill my battery?

5.4v?
well, yeah, dead.
You should have a low voltage cut off at 10.2 to save the beast.

You may be able to recharge it, if so make sure you get a good, FULL charge on.

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Re: Did I kill my battery?

Where is a good source to get a low voltage cutoff switch? How does it get wired in?
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post #6 of 13 Old 03-13-2013
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Re: Did I kill my battery?

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Originally Posted by rhr1956 View Post
Where is a good source to get a low voltage cutoff switch? How does it get wired in?
I've recently got one of these to install before my boat vent :



Got it for a tenner (sterling, that is) on Fleebay. They are sold under the name "Brocott" or "Kemo" battery guard or Kemo M148A.

You can adjust the cut off voltage on the small yellow potentiometer knob. Installation is easy - Wire it between your battery (and fuse) and your load (max 20Amp if you install it on a heatsink).
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post #7 of 13 Old 03-13-2013
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Re: Did I kill my battery?

Nice looking piece of kit and only a tenner! Sign me up.
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post #8 of 13 Old 03-14-2013
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Re: Did I kill my battery?

Maintenance is very simple, to reduce the depth of discharge.
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post #9 of 13 Old 03-14-2013
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Re: Did I kill my battery?

You should take more care your battery, nor you will kill your battery.
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post #10 of 13 Old 03-14-2013
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Re: Did I kill my battery?

The LVD above is okay for a low amp single circuit.
For a starter circuit, or the entire boat you can expect to spend more.
Here's a link to a series of LVD's that will protect starter circuits/batteries and the entire boat (200amp for example).
Battery-Related Products | Low Voltage Disconnect Switches48510 | Cole Hersee - Littelfuse

The cost a bit more than a tenner. They protect more than a single switch on the panel being forgotten.

The advantage is you'll never wake up in the morning and not have the juice to crank the engine, or drive 2 hours to your boat for a beautiful day of sailing and then spend two hours charging a dead lump of plastic lead and acid.

Here's one with a price listed - 130 amp capable, 263 bucks
http://www.tessco.com/products/displ...55&eventPage=1

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Last edited by chucklesR; 03-14-2013 at 08:35 AM.
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