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  On A New Battery And Its Rating of Cranking Amperes

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Author Topic:   On A New Battery And Its Rating of Cranking Amperes
NYmontauk17 posted 04-14-2009 08:47 PM ET (US)   Profile for NYmontauk17   Send Email to NYmontauk17  
[I] have a 2005 [Boston Whaler 170 MONTAUK boat]. [I] have decided to change my battery this year. [I] bought a [cranking battery with a rating of 600-amperes]. When [I] pulled out my original cranking battery, [I] noticed that it was [rated at] 800-amperes. Six-hundred amperes should be enough to start my boat.
jimh posted 04-14-2009 09:03 PM ET (US)     Profile for jimh  Send Email to jimh     
It is the motor more than the boat which determines the minimum battery rating needed to successfully crank over the engine.
NYmontauk17 posted 04-16-2009 10:26 PM ET (US)     Profile for NYmontauk17  Send Email to NYmontauk17     
its a 90 merc saltwater series
ratherwhalering posted 04-17-2009 03:09 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
525 Marine Cranking Amps MCA) or 450 Cold Cranking Amps (CCA)for that engine. Additional electrical loads from the boat will require larger batteries.
jimh posted 04-18-2009 01:57 PM ET (US)     Profile for jimh  Send Email to jimh     
If indeed the motor on the boat in question suggests the use of a battery with a rating of 525-MCA, then a battery with a rating of "six hundred amperes", either MCA or CCA, will be sufficient to start the motor.

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