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Author Topic:   deep cycle ok for starting?
Eric posted 08-25-2003 11:45 PM ET (US)   Profile for Eric   Send Email to Eric  
1993 Mercury 200, carb. Other power needs include the usual electronics for offshore fishing, as well as lights and baitwell.
I obviously need at least 2 batteries, just wondering if I need to make one of them a starting or dual purpose, or would it be ok to go with 2 or more deep cycle?

I just bought the boat, and it came with a relatively new deep cycle but not near big enough to make me want to use it as my primary "house" battery, so if I need a starting battery, then I'll end up needing two more.

JohnJ80 posted 08-25-2003 11:51 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
You don't say how the batteries were configured.

How I would do this is to have a separate cranking/starting battery. I would have a deep cycle for house electronics, and electrical needs. I would have nothing on the cranking battery other than the engine.

What I did on mine was to add the stealth one charger that allows me to charge the deep discharge battery from the motor alternator. See .

works very well. You connect this device between the two batteries. When the cranking battery has a voltage across its terminals of greater than 13V, the charging current is directed to the other battery. Terrific product, I use it to keep my trolling/house battery up to full charge. Does this very well.


Bigshot posted 08-25-2003 11:53 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
No need to buy the deep for electronics on say #2 and buy a cranking for #1.
Eric posted 08-26-2003 12:01 AM ET (US)     Profile for Eric  Send Email to Eric     
That makes sense Bigshot, I just wanted a bigger deep cycle than this one.
As far as configuration, the usual 1-2-both-off switch.
Tom2697 posted 08-26-2003 02:15 PM ET (US)     Profile for Tom2697  Send Email to Tom2697     
Eric, Since you want the 2nd battery for offshore use, why not add the extra safety of a dual purpose battery? The cost difference is minimal (<$5 at Walmart) and you never know when you might need it. I carry 2 dual purpose batteries and have been glad I did on a few occasions (forgot to change the switch when night fishing). I also change which battery I run on consecutive trips to extend the life of each battery. I have at least five years on the batteries (came with boat 2 years ago and last date stamps on the batteries read '98) and both still check out perfect.
Eric posted 08-27-2003 08:50 PM ET (US)     Profile for Eric  Send Email to Eric     
That makes sense Tom, and I've been thinking about one of the dual purpose batteries already.
Thanks for the replies, all.

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