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Old 02-19-2012, 12:16 PM   #1
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Charging deep cycle batteries

After checking the dead house batteries with Auto Zone and finding that they are able to accept a charge, I brought them home and am trying to charge them BUT they don't seem to be accepting he charge. Does it take an extra long time to charge them? Do I need a special charger (am currently using a 6V /12V charger set on 6)? Any advice/insights? Thanks for your help.
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Old 02-19-2012, 12:22 PM   #2
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Are they 6VDC batteries? And are they connected how?
Unless you have 6 Volt house batteries you need to be charging on the 12 volt setting.
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Old 02-19-2012, 12:26 PM   #3
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If they are 6v batteries connected in series they are charged as one 12v battery. Connect the charger to the battery posts that have the long cables that go back to the RV 12v system.
The only time you would use the 6v setting is charging a single 6v battery.
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Old 02-19-2012, 12:33 PM   #4
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Thanx for the fast replies. The batteries are 6 V and I'm charging the on the 6V setting on the charger. I charge one of them for 8 plus hours without it getting fully charged.
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Old 02-19-2012, 01:45 PM   #5
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Originally Posted by OldGerman
Thanx for the fast replies. The batteries are 6 V and I'm charging the on the 6V setting on the charger. I charge one of them for 8 plus hours without it getting fully charged.
Depending on the amp/volt output of the charger, it could take 2 days to bring it to full charge. Regular starting batteries are designed to put out lots of amps at once and to recharge quickly. Not so with deep cycle. If memory serves, 2 6v golf cart batteries in series at 14.2 volts will take 4 hrs to go from 50% charge to 90%. At 13.6 volts its more like a full day.

I have to assume a 6v charger would put out no more than 6.8 volts. Which would equate to a full 24 hrs.
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Old 02-19-2012, 02:44 PM   #6
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What is the amp setting for the 6 volt mode? The 6V charger I have is only 2A.
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Old 02-19-2012, 03:29 PM   #7
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Look at this link: Charging Deep Cycle Batteries
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Old 02-19-2012, 04:10 PM   #8
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A typical 6v deep cycle battery contains around 220-240 amp hours depending on the brand and model. If you're charging with a low amperage charger do the math. Even with a high amp 3 stage charger the battery will accept bulk charge for only so long, then ramp down. If the batteries were completely dead, like a light left on for a couple months, then sometimes you have to trick the charger into charging them by putting another partially charged battery into the circuit.
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Old 02-19-2012, 05:03 PM   #9
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re: "Regular starting batteries are designed to put out lots of amps at once and to recharge quickly. Not so with deep cycle." -- not this again :-( it may have been the case 50 years ago but modern batteries of the sort available for RV's don't quite fit the model any more.

You do need a charger that will put out about 40 amps (at least 20) at 7 to 8 volts to properly charge a six volt typical 'golf cart' RV battery during the initial stage. Once the 6v battery gets up to 7.2 volts, the charge current should be allowed to drop at that voltage until the charge current drops down to just an amp or two. It can take 8 to 12 hours to properly charge a healthy battery. A multiple stage battery charger will take care of this automatically. (the trick it in case of totally dead is a useful idea but a battery that dead is questionable - lead acid batteries don't take much of that sort of abuse in general)

If the battery is severely aged, prematurely other otherwise, it is sulfated and will act like a very small battery that won't store much energy. In this case, you need to look at some of the desulfation ideas. See the Lead Acid Battery Desulfation - Message Board for instance.
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Old 02-19-2012, 06:49 PM   #10
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Thanx for the fast replies. The batteries are 6 V and I'm charging the on the 6V setting on the charger. I charge one of them for 8 plus hours without it getting fully charged.

Well the standard GC-2 Six Volt Golf car battery (May be a U-2200 US-2200, T-105 or 105 or some other model number but GC-2 is the form factor)

Is around 220-235 Amp hours.

If it's below 50 percent (I gather yours are) and your charger is say 20 amp.

8 hours is NOT goign to do it. IF your charger is 10 amp. 8 DAYS might do it.
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Old 02-19-2012, 07:54 PM   #11
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re: "Regular starting batteries are designed to put out lots of amps at once and to recharge quickly. Not so with deep cycle." -- not this again :-( it may have been the case 50 years ago but modern batteries of the sort available for RV's don't quite fit the model any more.
I've read your rant on this subject all over this forum. I'm glad you're convinced but, you haven't seemed to convince the other 75,000 here, including me. You remind me of a professor who didn't know anything except what he read in a book....no practical experience and no common sense. Looking at your profile, I see 90% of your posts are about batteries. In not one of them have you ever stated any personal experience. I also note you have never mentioned what RV you had or that you even ever owned one. If you're here to impress someone, it ain't workin'.

Thanks IRV2 for the ignore option!

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My apologies to other forum members, but this needed to be said. Of course there's a good chance no one will see it, unless you do before a moderator does
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Old 02-20-2012, 11:31 AM   #12
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QUOTE=jlyon69;1088548]I've read your rant on this subject all over this forum. I'm glad you're convinced but, you haven't seemed to convince the other 75,000 here, including me. You remind me of a professor who didn't know anything except what he read in a book....no practical experience and no common sense. Looking at your profile, I see 90% of your posts are about batteries. In not one of them have you ever stated any personal experience. I also note you have never mentioned what RV you had or that you even ever owned one. If you're here to impress someone, it ain't workin'.

Thanks IRV2 for the ignore option!

BryanL Ignore =ON

My apologies to other forum members, but this needed to be said. Of course there's a good chance no one will see it, unless you do before a moderator does [/QUOTE]
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