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Best Battery?

Your old Chris-Craft electrical system can be a challenge. If it runs on "juice" pose your questions and offer your advice here.

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stefan
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Joined: Wed Mar 22, 2006 2:34 pm
Location: madison, WI
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Best Battery?

Post by stefan » Sun Feb 28, 2021 8:09 am

Restoring a "66 Cavalier Dory (283 V-8)...What is my best choice for a battery? someone suggested very high cold cranking amps

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Bilge Rat
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Joined: Thu Jul 16, 2015 4:02 pm

Re: Best Battery?

Post by Bilge Rat » Sun Feb 28, 2021 12:38 pm

There is a better marine rating than cold cranking amps (from Interstate Battery's website):

Cold Cranking Amps (CCA) is a test conducted at 0 F (-18 C) for 30 seconds without falling below 7.2v at the battery's CCA rating

Marine Cranking Amps (MCA) is a test conducted at 32 F (0 C) for 30 seconds without falling below 7.2v at the battery's MCA rating.

To pass the CCA test, a 700 CCA rated fully charged battery would be chilled to 0 F (-18C), then load tested at 700 amps for 30 seconds. To pass its rating, it has to maintain at or above 7.2 volts.

To calculate the MCA rating of a battery compared to its CCA rating, multiply by 1.25.

MCA is a better option for the environment our boats should be operating in, since the water would most likely be frozen at 0 degrees F. Of course there are maximum MCA ratings depending on the battery group size that will fit the battery compartment on the boat.
1966 Lyman Cruisette 25 foot "Serenity Now!"
1953 Chris Craft Sportsman 22 foot "Summerwind"

stefan
Posts: 28
Joined: Wed Mar 22, 2006 2:34 pm
Location: madison, WI
Contact:

Re: Best Battery?

Post by stefan » Mon Mar 01, 2021 7:47 am

Thanks B. Rat.

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