Thursday, Sep 16, 2010 at 23:45
You're welcome Peter,
yes that's right.
A deep cycle battery doesn't have a CCA rating because it's got a smaller number of plates (electrodes), but they're thicker than in a starter battery.
If a small AGM battery is rated in CCA, it's a motorcycle battery.
But you want Ah, not CCA.
See how batteries can be grouped:
Overall weight: this determines the cost of the battery, and is taken to be the same when comparing the following properties:
High Ah: smaller number of thicker plates
CCA rating: higher number of thinner plates
Rule of thumb:
at equal battery weights, the Ah goes up while the CCA goes down and the other way around.
F.e. while the battery you're looking at weighs 6 kg and is rated 255CCA and 18Ah, another equally heavy (thus similar money) may have no CCA rating, but may offer 24Ah.
Because a deep cycle battery offers more Ah per Dollar than a starter battery, look for the lowest Dollar per Ah ratio you can find.
Hope this explains it?
cheers, Peter
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