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Old 10-29-2013, 07:27 AM   #1
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Battery Voltage

Need some help in determining what my house and cranking batteries should read voltage wise after sitting for a while; after sitting dormant for a couple of weeks they read 12.50 on house side and 12.60 on cranking side; should these batteries be maintaining a higher voltage. they charge up great--13-14V range then drop down just wondering if this is normal. Thx
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Old 10-29-2013, 07:28 AM   #2
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All batteries are not on any charging system while dormant have RV in self storage with no access to shore power.....
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Old 10-29-2013, 08:07 AM   #3
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http://www.mmbalmainauto.com.au/PDF/..._batteries.pdf

The 12volt Side of Life (Part 1)

See if these help. They indicate you are 85 to 90% charged on your batteries. Of course the charge will bleed off the more they sit so having them on a charger will preserve them.
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Old 10-29-2013, 11:49 AM   #4
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12.6 volts is 100% charged on an idle, battery at rest for 24 hours or more with no parasitic loads.
12.5 is nearly full ... but in the same conditions... might be showing the first signs of age. NOTHING to worry about.
Immediately after charging ...you might see anywhere up to 13.4 V on the same batteries but this is what is called a SURFACE charge and dissipates over time. There is no problem with your batteries if they rest finally at 12.5 and 12.6V.
If they are wet cell batteries...you might consider a small investment in a turkey baster type hyrometer at the local auto parts store. Simply sucking up some fluid into the baster can tell you the exact condition of every cell in your battery whether at rest or under load. Otherwise...wait at least 24 hours after ANY in or out activity on the battery to take an electrical reading.
*******
This might be interesting to some on surface charge. My friend on another forum decided to measure voltage drop in storage over a COLD winter. Here is the first picture after charging:

You can see 13.77 volts...a large surface charge on an OLD battery!
Three days later at rest....

12.9Volts is still a surface charge after THREE days! This battery at 100% reads 12.7ish.
So don't think you can get an accurate battery condition reading at less than 24 hours with a voltmeter...though anything less than 12.6 before 24 hours are up should indicate that there's at least some wear! A dummy load or a turkey baster is needed for a quick and accurate measurement of battery state.
Harbor Freight sells a 100amp dummy load for 20 bucks. Saves a lot of time if you have AGM's!
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Old 10-29-2013, 05:43 PM   #5
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Your voltage readings after a few weeks are.......PERRRRRRRRFECT ,can't get any better.
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Old 10-29-2013, 05:59 PM   #6
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Quote:
Originally Posted by mrock View Post

Need some help in determining what my house and cranking batteries should read voltage wise after sitting for a while; after sitting dormant for a couple of weeks they read 12.50 on house side and 12.60 on cranking side; should these batteries be maintaining a higher voltage. they charge up great--13-14V range then drop down just wondering if this is normal. Thx
Those are great readings for batteries that are not being used or charged.

When at Float SOC with the charger attached and running they should read about 13.3 to 13.6.

Dr4Film ----- Richard
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