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Unread 01-28-2013, 12:02 AM   #11
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Default Re: Batteries 100% Discharged

Well, it's been over a week now and those batts do seem to be coming around. They run longer, based on my "gas gage" on the dash and seem to be about equal to the performance I experienced a year ago. Don't know what, if anything, to attribute this to, but it's gotta be the repeated high-amp/voltage charging and/or the battery minder/desulphation device.

Thanks for all the help, guys!
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Unread 01-28-2013, 08:03 AM   #12
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Default Re: Batteries 100% Discharged

SM,
Congrats on your [seemingly] success with those batteries. Battery Minder claims that their devices will resurrect a sulphated battery, maybe their claims are true...??

Don't expect your batteries to be "like new", I think they've probably suffered permanent damage. That means if they are 2 years old, they'll act more like they're 4 years old and will fail altogether much sooner than might have otherwise been the case.

Also, you should try to determine what caused the total discharge of your batteries. Although 8 months is a long time, if they were clean as you said they were, they shouldn't have gone 'dead' in that time. If you do nothing else, next time you store the cart for a lengthy time, pull one of the battery cables. If you don't have a tap for 12-volt stuff, just disconnecting one cable will prevent discharge from an external parasitic load.
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Unread 01-28-2013, 11:48 AM   #13
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Default Re: Batteries 100% Discharged

What if you connect charger to it run cont for 30 0r 40 hrs what would happen i did that once on a set 8 volts where lights and accesories ran off 2 batteries they got behind and that brought them back up to good
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Unread 01-28-2013, 02:09 PM   #14
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Default Re: Batteries 100% Discharged

New member. Yamaha 2007 factory rebuild owner bought in Nov 2010.
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Unread 01-28-2013, 02:32 PM   #15
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Default Re: Batteries 100% Discharged

Yeah, thanks JD. Initially, I thought the charger was bad, but then realized the guy who was to keep it plugged in...didn't! Yes, I understand I now have some "wounded batteries", but hoping to get another year or two out of 'em.
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Unread 01-28-2013, 06:36 PM   #16
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Default Re: Batteries 100% Discharged

SM,
Is your charger of the type that will automatically 'kick on' if the battery voltage drops a bit? I have several chargers, and I'm unsure if any of them will re-start on their own. A couple of them are simple timer jobs, and I KNOW those won't start automatically. With those, I just set the timer for a couple of hours or so, every month. Seems to work OK.

I have a couple of other chargers that are constant voltage like the first ones, but somehow sense when the pack is pretty much 'full'. They then start a timer that runs for about 3 hours to top off the charge. But even those need to be manually initiated.
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Unread 01-28-2013, 09:21 PM   #17
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Default Re: Batteries 100% Discharged

I don't really know what it does...it's one of the old analog jobs....2004 vintage. It starts charging at 15A, then decreases to the point of shutting off. Not sure how it handles a trickle draw-down.
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Unread 01-28-2013, 09:41 PM   #18
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Default Re: Batteries 100% Discharged

I know on mine, if you lose ac power while the charger is on, it won't restart until you pull the plug on the cart and reinsert it. This company has an interesting variety of chargers and maintainers. They may be worth a look if you need to keep your batteries maintained in storage.
http://batteryminders.com/
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