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Unread 08-12-2018, 04:32 PM   #1
Not Yet Wild
 
Join Date: Jan 2018
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Default Batteries went dry while on vacation

Hey All,

We went on vacation for a month and when we came back the cart wouldn't go. I looked at the batteries and there was no water left in them. My sister-in-law took the cart out for a spin with her kids when they came to check on the house, and she left it plugged in for the entire month we were gone.

1. Is leaving the cart plugged in (99 DS Series, club-car external charger) bad for the batteries? Is that what caused them to boil dry? I usually just plug it in once a week or two if its not being driven to handle the self-discharge.

2. At this point I've added water (about 1/4" below the fill tubes) and I've been charging for ~30 hours. Batteries are still taking ~3-5A from the charger, and they're bubbling (but not boiling). I've unplugged them at this point. When I first disconnected them from the charger they were reading 55.5V across the pack, and about 5-10 minutes later they've dropped down to 53.5V with no load.

Are these batteries toast? Any way to rehab them?
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Unread 08-12-2018, 06:38 PM   #2
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Default Re: Batteries went dry while on vacation

They "are what they are", whatever service they provide is all your gonna get. Nothing to do about it, permanent damage. I also think you have a bad OBC, it shouldn't be able to stay on for 30 hours, even if the charge didn't complete.
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Unread 08-12-2018, 07:02 PM   #3
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Default Re: Batteries went dry while on vacation

Down to 51.9V now.

I did an OBC reset prior to initiating the charge, which Iíve read changes the way it charges. Could that be why it was still charging (at very low amps) 24-30hrs later?
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Unread 08-12-2018, 07:18 PM   #4
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Default Re: Batteries went dry while on vacation

Should have "timed out". Wait a minute, before the number was 30. Now it might be 24? That could make a difference.
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Unread 08-13-2018, 10:21 AM   #5
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Default Re: Batteries went dry while on vacation

They're probably cooked, but run them and see how they do.

Also agree that the OBC is faulty. That should be shutting the charge off at 16 hours, regardless of battery charge level.
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Unread 08-13-2018, 09:40 PM   #6
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Default Re: Batteries went dry while on vacation

Is it worth replacing the OBC or should I just replace it with a smarter charger? I’m under the impression all the OBC does is regulate charging.
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Unread 08-14-2018, 09:00 AM   #7
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Default Re: Batteries went dry while on vacation

If you are convinced that you have a failed OBC, then most would make the change to a higher technology smart charger, for the added features (not the least of which is a float mode to support long periods of time plugged in and away).
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