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Unread 10-14-2013, 07:23 PM   #11
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Default Re: Any chance this is NOT bad batteries?

please by all means correct me if I'm wrong. But isn't the point of the OBC to only allow the charger to replace the amount of energy taken from the batteries? in theory if that is the way it works, wouldn't the OBC possibly need to be reset thinking that the cart is not using as much energy as it has been?
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Unread 10-14-2013, 07:56 PM   #12
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Default Re: Any chance this is NOT bad batteries?

Any chance you overfilled your battery's. My theory is that if you overfill you dilute the acid and they can't charge to full charge. My 2 cents worth.
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Unread 10-14-2013, 08:05 PM   #13
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Default Re: Any chance this is NOT bad batteries?

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Any chance you overfilled your battery's. My theory is that if you overfill you dilute the acid and they can't charge to full charge. My 2 cents worth.
Have not had to put any water in since I got the cart. I did check them yesterday and they were about 1/4" to 1/2" above the plates as they are supposed to be.
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Unread 10-14-2013, 08:16 PM   #14
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Default Re: Any chance this is NOT bad batteries?

What kind of voltage should I see WHILE charging? Readings while charger was on was 60.1 as soon as I unplugged the charger voltage dropped to 54.2 I know 100% charge is 50.9. What is safe and what is dangerous while I try to figure this mess out?
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Unread 10-14-2013, 08:18 PM   #15
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Default Re: Any chance this is NOT bad batteries?

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Originally Posted by Storm S View Post
Woah Woah Woah..... Are y'all telling me I have been getting an average 17 mph and 14 mile per charge on 12 year old batteries?!?!?!?!?! Ummmm........ Or does D1 mean 2011 not 2001?!?!?!?
If they are Trojans it is possible for them to be 2001's. Unusual, but possible.
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Unread 10-14-2013, 08:21 PM   #16
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Default Re: Any chance this is NOT bad batteries?

when your cart is fully charged the battery pack will get up to 60 - 65 volts,
In fact, the charger may have to take a 48V battery pack up to 67V, or above, to fully charge it.
On the other hand, 59V may fully charge a 48V battery pack.
The voltage it takes to fully charge a 48V battery pack depends on who manufactured the batteries in the pack as well as their age and condition.

By definition, a lead-acid wet cell is fully charged when the specific gravity of the electrolyte ceases to increase while a charging current is passing through it. Since open-circuit voltage increases/decreases as the electrolyte's specific gravity increases/decreases, open-circuit voltage is an indirect or secondary means of monitoring the electrolyte's specific gravity and is often used to do so.

An ideal charger would monitor pack voltage and when it ceased to rise over a predetermined period of time, it would stop the regular charging mode and go into a float charge mode, however few, if any, chargers typically used by golf cart owners are ideal. Most of them simply shut off at a predetermined voltage that is high enough to almost fully charge most battery packs without being so high that repeated use would significantly harm battery packs that are fully charged at the lower end of the typical voltage spectrum needed to fully charge a battery as determined by empirical data.

Here is Trojan's recommended charge curve for a single (2V) deep cycle wet cell. There are 24 cells in a 48V battery pack, so do the math and you get 58.80V to 66.96V. However, Trojan uses an electrolyte that is 27.7% sulfuric acid by weight (SG = 1.277) and other battery manufacturers use different concentrations, so the on-charge voltage that is typically reached when their batteries are fully charged, will be higher or lower.
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Unread 10-14-2013, 08:21 PM   #17
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Default Re: Any chance this is NOT bad batteries?

ok first leave it charging !!!
your volts while charging will be 60v+
AFTER charger shuts off .. dont touch for 12 hours .. then check volts they should be as stated below



let us know tomorrow what your at rest volts are
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Unread 10-14-2013, 08:28 PM   #18
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Default Re: Any chance this is NOT bad batteries?

Thank you everyone. I am plugging it in for the night. Will take a voltage reading in the morning. Let is sit for the 12 hours and then take another reading. Then we can go from there.
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Unread 10-14-2013, 08:29 PM   #19
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Unread 10-15-2013, 07:11 AM   #20
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Default Re: Any chance this is NOT bad batteries?

"Have not had to put any water in since I got the cart."

If you have had your cart more than a few weeks you should have had to add water. The correct level is 1/8 to 1/4 in. below the bottom edge of the fill port.
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