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Old 01-10-2014, 05:23 PM   #1
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Send a message via Yahoo to frederick w
I'm learning about Batteries ???

I found out that if a 12 volt battery reads 11.8 to 12.0
it's dead. (my two house battery in my MH)

I always thought if a bat. reads 12 volts even or slightly
less it was good to go.

I don't know if I'm the only one in the world that didn't
know that; probably.

PS: maybe it's my age, I'm 71

Fred, US Army Aviation, 61-70
2002 Itasca Winnebago Ford V10
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Old 01-10-2014, 05:28 PM   #2
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Not so fast...they may be recoverable.

2000 HR Endeavor, 3126 CAT, Freightliner, "The Highway Hilton" pulling a BMW.
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Old 01-10-2014, 05:35 PM   #3
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A couple of good links:

Battery | RV Blog by Charlotte RV Center

Deep Cycle Battery FAQ

Frequently Asked Questions (FAQ) - DC Battery Specialists

This is cool. Click on the items that are appropriate on the left an see how things work:
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Old 01-10-2014, 05:46 PM   #4
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Hi frederick w,
The batteries may or may not be okay. Consider:
1. Check the water (if they have caps you can remove).
2. Fully charge the batteries. This may take several days.
3. If the batteries have caps for you to check the water. While your waiting for the batteries to charge, go to your local automotive store and purchase a hydrometer (not expensive). There should be instructions how to use the hydrometer and what the readings should be. The key is all the cells should be very close to being the same.
4. With the batteries fully charged, disconnect the charger and wait overnight.
5. With a meter check the VDC. It should be 12.6 VDC or more, but not less.
6. Test each cell with the hydrometer.
7. If the batteries do not have caps to check the water, do step #2, 4 and 5.
8. If the VDC checks good, there are two choices.
8a. Stop now and use the batteries as you normally would. They may or may not hold a charge. If you find their life to be short, replacement is the next step.
8b. Purchase a battery load tester. Buy one rated at least 100 AMPS, mine is rated 130 AMPS. With the batteries fully charged test each battery with the load tester. This will tell you, immediately, if the batteries are good or bad.
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Old 01-11-2014, 12:38 PM   #5
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The age of the batteries comes into play as well. If they are
old then it may not be worth the time, effort and money to
try to save them. It is hard on a battery to drain them way
down as yours have been drained.
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Old 01-11-2014, 01:00 PM   #6
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Here is some more Tech Stuff.
98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
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Old 01-11-2014, 01:07 PM   #7
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Here are two more VALUABLE links to have bookmarked in your list.

The 12volt Side of Life (Part 1)

The 12volt Side of Life Part 2

Dr4Film ----- Richard

2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
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