boat battery stupid question
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Posted on Thursday Mar 13, 2014 at 3:15 PM  

On our 'toon we have a battery for starting and it also runs the locator and lights. Should this one be a marine starting battery or should I use one of the marine dual purpose batteries since it runs the lights and locator? It currently has one with 600 cold cranking amps,750 marine cranking amps and 160 reserve capacity. Anybody know if this even the right size for the above use. By the way it is on a 2001 90hp mercury. Know of any good deals or battery brands recommended?

We run a separate battery for the trolling motor and bait tank. thanks for your input.


good fishing and God bless!
Posted on Thursday Mar 13, 2014 at 4:11 PM  
With 160 reserve capacity it sounds like you have a group 27 deep cycle battery.  600 cca should be plenty for a 90hp 2-stroke.  If you had a large optimax or 4-stroke you would need a lot more cca than that.  I have mine wired with those same loads with a group 24 battery and I would not worry unless I needed the anchor lights for several hours of fishing without the motor running.
Posted on Thursday Mar 13, 2014 at 4:32 PM  
Thanks for your help BJames. What size motor do you run? I am not sure that this battery is the size that was originally on it so I wonder if I could use a 24 group battery?
good fishing and God bless!
Posted on Thursday Mar 13, 2014 at 4:33 PM  
Highwater - there was thread last year, dealing with the difference between marine batteries and just car batteries. You could probably search and find it. As I remember, there's isn't a bunch of difference. Bill James would know that answer. If it were me, I wouldn't say there's enough to justify dumping your current battery just to get one that says "marine" on it. 
The more you practice, the luckier you get.
Posted on Thursday Mar 13, 2014 at 4:33 PM  
And the one I have now is a 27 group battery.
good fishing and God bless!
Posted on Thursday Mar 13, 2014 at 4:36 PM  
Thanks TMD but I have to dump the current as it tested bad. I was wondering if I need a marine starting or dual purpose one as I saw both kinds at some store sites. What you think?
good fishing and God bless!
Posted on Thursday Mar 13, 2014 at 5:20 PM  
Since you have the room, stick with the group 27.  dual purpose and starting batteries are built just a little different.  Dual purpose and deep cycle batteries have higher reserve capacity and lower CCA than starting batteries.  With your smaller motor and having the locator and lights on it I would go for max reserve over CCA.  I have read some of the larger optimax and v-max motors need over 1000 cca to start reliably.
Posted on Friday Mar 14, 2014 at 7:29 AM  
Thanks guys I took your advice and stuck with the 27 group dual purpose battery. Now just gotta get everything lined up on the boat. Ishould have been on the water already!
good fishing and God bless!
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