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Unread 04-05-2011, 05:51 PM   #1
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Default Testing batteries

I just want to make sure the proper way to test my batteries. I just bought a hydrometer and I've already have a digital voltmeter. I have them all charged to start with, how long am I suppose to wait be for I start my test?
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Unread 04-05-2011, 06:50 PM   #2
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Default Re: Testing batteries

You should wait a min of 12 hours after the completed charge.
Here is a chart to show what 100% is voltage wise.
A reading above 100% means the batteries are still settling.
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Unread 04-05-2011, 07:48 PM   #3
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Default Re: Testing batteries

If you know anyone with a good load-tester,this is a quick easy test.Harbor-Freight has a large one(It will load 500amps) for $80.I use this same unit on my service-truck,i've had it for 3 years,no problems.I compared it against my electronic hand-held load-tester($180 from Snap-On)and also against my roll-around shop-size unit and its' dead-on.If you use a load-tester it must be capable of loading 1/2 of the cca of the battery to test it properly(500amp tester,1000 cca).Hope this helps.
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Unread 04-05-2011, 08:21 PM   #4
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Default Re: Testing batteries

Well, I did the test 1 hour after full charge and I only had (3) batteries that read in the good range. I'll do another test tomorrow. I'm testing ( 6 volt batteries. Would it be ok to test them later than 12 hours, say 24 hours?
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Unread 04-06-2011, 09:11 AM   #5
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Default Re: Testing batteries

I hope you purchased a single float hydrometer with temp correcting scale rather than a antifreeze multi float unit which is great for its use BUT NOT BATTERYS.
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Unread 04-06-2011, 09:36 AM   #6
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Default Re: Testing batteries

I'm with Pachanga90 on this. A set of batteries is a huge investment and a good load tester is the best possible diagnostic tool yet no one seems to be that interested in using one. If you were to use the tester say once a month you could then find a weak battery before it causes a problem. Here are (imho) three good reasons to use the load tester as the primary tool.
1. The tester will identify a weak battery before it starts to literally suck the life out of the pack
2. Getting that weak battery out of there will stop your charger overcharging the other 5/7 and shortening their lives
3. By identifying and replacing the weak battery you are spreading the cost of replacing the pack over a longer period thus avoiding the pain of a ~$700 expense in on hit.

I am sure that there are as many opinions as there are guys on this forum but can anyone show me the error in my logic.

Dave
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Unread 04-06-2011, 11:12 AM   #7
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Default Re: Testing batteries

I started working on batterys in 1944 when we were still replacing cells and most new batterys were still 2 years away? All we had were hydrometers and what we called a pile tester ( load tester ) but I was always able to predict battery going bad long before it showed up on THAT LOAD TESTER? Its all in what you learn and are good with?
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Unread 04-06-2011, 11:29 AM   #8
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Default Re: Testing batteries

My "load tester" is getting dusty. My battery pack draw down machine is more accurate when coupled with the other 2 tools.... For most owners it has always been a combination of 2 or even 3 tests to positively determine a pack &/or individual battery condition.... unless it reads 4v or 2v, I can figure out the dead cell thing
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Unread 04-06-2011, 11:32 AM   #9
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Default Re: Testing batteries

The dealer I purchased my cart from used a Load Tester on my batteries and said they were ok. My charger would not shut down so I used a hydrometer made for batteries. The hydrometer found one bad battery. We changed the battery and solved the problem.
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Unread 04-06-2011, 12:44 PM   #10
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Default Re: Testing batteries

The equipment is only as good as the operator, lol.
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