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Old 01-17-2012, 07:06 PM   #29
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Originally Posted by jauguston

All Trojan batteries have a CCA rating.


My Trojan T-145plus' do not:


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Old 01-17-2012, 10:23 PM   #30
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if you can't find the CCA for a battery, it is easy enough to measure it.

See, for example, Testing Lead Acid Batteries – Battery University

or, if that's too fancy, you can always go back to the definition: "Cranking amps are the numbers of amperes a lead-acid battery at 32 degrees F (0 degrees C) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12 volt battery)." (Automotive battery FAQ questions from GNB Systems) -- what's nice about specifications is that you can always make your own measurement (and there are even detailed specifications on procedure if you want to get really picky).

What Trojan is telling you when they don't post a particular specification like CCA in their marketing literature is their intended market for a battery.

The GNB link is an FAQ that also cites deep cycle as having thick plates but they don't tell you, like the NAWS FAQ does, exactly what the range is for the batteries commonly available at retail for RV's and autos. Also, if you read critically, you'll note that it's a relative reference with no boundary implied or stated.

If you have your thinking cap on, you might consider what a CCA will tell you about using an inverter to power your RV microwave off a battery on a cold morning to heat up a cup of coffee.

That 'thinking cap' might also be useful in evaluating the anecdotes about sudden battery failure on deep discharge - consider why jumper cables are common items in auto emergency kits and how many of your friends (or even yourself) have need a jump start because you left a light on in the car or something. Many have had such experiences, even several times, and have not had need to replace the battery in their car. How does that experience fit with the anecdotes you hear?

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Old 01-17-2012, 10:48 PM   #31
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A deep cycle battery does not have a CCA rating, that's an engine starting battery. A deep cycle battery is not made to give a high amp short burst, they have thicker plates and are optimized for longer/lower draws.
A starting battery has a CCA rating and plates are thinner and optimized for high/short draws.
The Interstate U-2200 does not have a CCA rating according to the Interstate website, neither do the Trojan T-105, T-125, or T-145's according to the Trojan website
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Old 01-18-2012, 08:12 AM   #32
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The CCA "rating" is a specification of battery properties. It can be measured for all batteries. You can't "not have" a measurement of some property that does exist. Whether or not it is reported in marketing literature (e.g. 'website') is a matter of whether or not the website owner thinks it will help him sell the product.

re: "thicker plates and are optimized for longer/lower draws" -- think about it: consider why all lead acid batteries of the type we use are based on the 'sponge in a grid' design. Consider the matters of effeciency in use of material for energy storage.

optimized for energy capacity over power draw I can go with as that is, in effect, adjusting the Peukert coefficient in the battery (but that's a different thing than the CCA measures). Trying to explain it by 'thicker plates' doesn't make sense as thicker plates put more lead inside structure where it can't react to produce energy and better connections (lower resistance) are not related to thickness.

There's a lot of parroting of things that might have had some truth in them fifty years ago. There seems to be little thinking about the implications of what is being asserted or its applicability to the task at hand. That is the caution to keep in mind, IMHO.

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