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Old 21 April 2009, 07:55 AM
  #1  
velohead66
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Question Life Of Disconnected Car Battery
Just wondering how to treat a disconected car battery, and life thereof.
If I have an expensive/light one for track days that wont run too much stuff
(ie wont run radio/full beams etc) and a cheap/heavy one for normal use.
Is that practical ?

Any pros/cons
is life affected, and/or charge.
Would a small one have less cranking ability (is that amp hours ?)

Bit confused about the whole thing, as you can see.
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Old 21 April 2009, 08:39 AM
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One rule you need to adhere to is NOT to store a battery on a concrete floor. Don't ask me why, but it's death to them.

Best stored on a shelf, kept from frost/heat and trickle charged occasionally when not in use.

As for output, it ought to be marked on the batteries somewhere, in Amp hours (Ah). The larger the number, the better the cranking ability, but so long as the car is a good starter, it ought not to matter. Amp-hours refers to the TIME, (hours) it can produce the current, (Amps), so for example, a 300Ah battery can produce 300 Amps for one hour, 600 Amps for half an hour, 1200Amps for 1/4 hour etc.

Most starters draw between 400 and 600 Amps, so a fully charged battery has no problem. It's only when it needs to crank and crank that problems occur.

Obviously, the figures above are to total exhaustion of the battery, and don't occur in "real life" since as the battery loses charge, it also experiences a drop in voltage, so needs MORE current to turn the same starter.......thus it won't last anything like a half hour at full current

HTH
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Old 21 April 2009, 04:23 PM
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Basically, don't allow it to sulphate. I'll be as bold to say 90% of dead batteries are caused by them being damaged by being allowed to fall below 100% stae of charge (SOC) for a period of time allowing them to sulphate, which slowly reduces its maximum capacity until the point it cannot store enough charge to start the engine.

So, every month check the voltage (open circuit- disconnected for at least 24 hours after any charge/drain being applied to ensure no false reading is given) and compare them to the voltages given in following table at the given ambient temperatures, if its below 80% top it up. Idealling using a smart charger such as those made by Accumate/Optimate or C-tek, as these will not overcharge nor needlessly "boil" the battery electoloyte (which also degrades its maximum capacity).

Reference table as follows: (source: http://www.batteryfaq.org/ )
Code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>

</head>
<body lang=EN-US><h3>
<p class=Title>Open Circuit Voltage (OCV) vs. Temperature<br>at Various States-Of-Charge (SoC)<br>for a Wet "Maintenance Free" 

(Ca/Ca)<br>Car Battery Table</p><br>
<div align=center>
<table summary="SG SoC" border=1 cellspacing=0 cellpadding=0><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>Electrolyte Temperature (Fahrenheit)</p>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>Electrolyte Temperature (Celsius)</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt;border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>100% SoC</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>75% SoC</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>65% SoC</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>50% SoC</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>25% SoC</p></td>
<td width=50 valign=top style='width:50pt; border:solid windowtext 2.25pt; border-left:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>0% SoC</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>120&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>48.9&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.793</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.563</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.463</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.313</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.013</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.773</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>110&deg;</p></td>
<td width=136 valign=top style='border-top:none; border-left:none; border-bottom:solid windowtext 2.25pt; border-right:solid 

windowtext 2.25pt; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>43.3&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.791</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.561</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.461</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.311</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.011</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.771</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>100&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>37.8&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.788</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.558</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.458</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.308</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.008</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.768</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>90&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>32.2&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.785</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.555</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.455</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.305</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.005</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.765</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">80&deg;</font></p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText><font color="blue">26.7&deg;</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">12.780</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">12.550</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">12.450</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">12.300</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">12.000</font></p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText><font color="blue">11.760</font></p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>70&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>21.1&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.773</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.543</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.443</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.293</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.993</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.753</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>60&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>15.6&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.764</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.534</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.434</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.284</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.984</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.744</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>50&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>10.0&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.752</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.522</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.422</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.272</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.972</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.732</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>40&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>4.4&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.736</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.506</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.406</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.256</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.956</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.716</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none;padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>30&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>-1.1&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.718</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.488</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.388</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.238</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.938</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.698</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>20&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>-6.7&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.696</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.466</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.366</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.216</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.916</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.676</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>10&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>-12.2&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.672</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.442</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.342</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.192</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.892</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.652</p></td></tr><tr>
<td width=136 valign=top style='border:solid windowtext 2.25pt; border-top:none; padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>0&deg;</p></td>
<td width=136 valign=top style='border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; padding:0in 5.4pt 0in 

5.4pt'>
<p class=PlainText>-17.8&deg;</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.646</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.416</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.316</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>12.166</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.866</p></td>
<td width=50 valign=top style='width:50pt; border-bottom:solid windowtext 2.25pt; border-right:solid windowtext 2.25pt; 

padding:0in 5.4pt 0in 5.4pt'>
<p class=PlainText>11.626</p></td></tr></table></div><br>
<p class=ListContinue3>
For example, if the electrolyte is at 20&deg; F (-6.7&deg; C), the Open Circuit Voltage reading would be 12.696 for a 100% State-

of-Charge. At 100&deg; F (37.8&deg; C), the Open Circuit Voltage reading would be 12.308 for 50% SoC and a reading of 11.773 or 

lower at 120&deg; F (48.9&deg; C) would indicate a discharged battery.</p> 
<p class=SubTitle><a href="#index">[back to Index]</a></p><br><br>
<p class=List3><a name="interpret"></a>
4.4.4. Interpreting the SoC Measurements</p>
<p class=ListContinue3>
If the State-of-Charge is <b>BELOW</b> 75% using either the Specific Gravity, voltage test or the built-in hydrometer does 

<b>not</b> indicate "good" (<font color="green"><b>green</b></font> or <font color="blue"><b>blue</b></font>), then the battery 

has a low charge and needs to be recharged.</p>


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Last edited by ALi-B; 21 April 2009 at 04:52 PM. Reason: I'm still a bit rusty with the old HTML
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Old 21 April 2009, 04:47 PM
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Wooo, who would have thought editing HTML for Vbulletin would be buggy as the above (got there in the end )
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Old 22 April 2009, 04:35 AM
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Thanks for the info, looks like it could be a go-er.
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