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Is this battery shot?

Old 10-01-2014, 03:23 PM
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Left a washdown pump on which ran the batteries down to the point nothing would come on. Changed the battery switch to "both" and both motors started right up. Let them run for 15 minutes, switched off " both", and motors fired right up. However one engine is only charging at 13.7 amps at idle while the other is at 14.5. We have 3 batteries, 2 for motors and one for house, two battery switches. Did I ruin a battery?
Old 10-01-2014, 03:28 PM
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It takes more than 15 minutes to bring a battery up to snuff, two batteries will take longer than one. Charging rate is not the same as battery voltage. The engine rpm if raised may show a better charging rate on the low one. Your wash down may be on the single, and that is why it is lower, it takes hours not minutes to top off.
Old 10-01-2014, 03:52 PM
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Charge them with a charger and put a load tester on them. How old are they?
Old 10-01-2014, 03:54 PM
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1NO, I think I'm feeling a little better then. I'll keep my fingers crossed. Thanks for the comment.
Old 10-01-2014, 03:55 PM
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Originally Posted by Marlin009 View Post
Charge them with a charger and put a load tester on them. How old are they?
Batteries 2 years old.
Old 10-01-2014, 04:15 PM
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Is the battery that you ran down the one that is showing 13.7 volts? I would bet that it is.

Charge the battery over night if you have a charger. Once it is fully charged I suspect that you will start seeing more or less 14.5 volts once the engine has been running several minutes after you have started the motor. Right now the battery is drawing so much current trying to recharge itself that it draws the voltage down.
Old 10-01-2014, 05:02 PM
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Thanks Jethro. I'm betting (and hoping) you're right. We'll see what we've got once it's fully charged.
Old 10-01-2014, 05:18 PM
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my alternator has 75 charging amps. My batteries have ~100ah so i would need to run my motor over 2000 rpms for a full hour and then some to fully charge my batteries and that's if they are fully discharged. When you charge your batteries, put them on a nice slow trickle charge over night.
Old 10-01-2014, 05:59 PM
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I would be more worried about the pump, they cost more. Atleast mine did and will burn up
Old 10-01-2014, 06:01 PM
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2 years... you likely have a little life in it but deep discharging it death on the battery. Remember if you change on you should change them all.

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