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New boater battery question

Old 10-16-2011, 05:39 PM
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Default New boater battery question

I'm enjoying my first power boat (19' bay boat) and have a few battery questions.

The two batteries in the front for the trolling motors appear ro be "MS" for marine starting. The battery in the rear for starting is a deep cycle. Not sure what the previous owner's thinking was here, but now I know why I only got one hour on the trolling motor.

Should I scrap all the current batteries and get two deep cycles for the trolling motor and a new starting battery for the back? Can I put the two "MS" batteries from the trolling bay to the rear and wire them in series to give me some backup there (two batteries for starting)?

Sorry for the newbie questions-just trying to figure this out.
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Old 10-16-2011, 05:55 PM
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Do you have any battery switches? I think I would try swapping them first and verify how old they are before putting out some serious bucks for 4 new batteries.

..and we always like to see pics when anyone gets a new ride!
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Old 10-17-2011, 07:13 AM
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I have no battery switches. The batteries all date to 2006. Since the trolling motor is 24volt, and you are supposed to use two similar batteries(right?) I assume that I need to get two new deep cycles.
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Old 10-17-2011, 07:28 AM
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Just don't switch the "battery switch" when the motor is running if you put a switch in your boat
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Old 10-17-2011, 07:35 AM
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Originally Posted by Bronson View Post
I have no battery switches. The batteries all date to 2006. Since the trolling motor is 24volt, and you are supposed to use two similar batteries(right?) I assume that I need to get two new deep cycles.

If the batteries are all from 2006 I would recomend changing them all while you are dealing with it. If you want to save some cash I uess you could move the batteries you have to the trolling motor back to the engine for starting duties. Remember though that a 5 year old battery is an OLD battery. We use alot of Oddyssey and Deka batteries and both of them make specific batteries for both of your needs. And yess you want to add a battery switcher.
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Old 10-17-2011, 07:40 AM
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I too agree that five year old batteries should be replaced. You can also add an onboard battery charger that will keep the new ones up to snuff.
I really dont think you will need a battery switch if using a pair of 12v for the 24v trolling motor and a separate 12v for the starting battery. What would there be to switch? Just to turn them off? I don't feel a switch is warranted.
Your thinking is right in that the previous owner wasn't thinking properly as he seems to have reversed the batteries.
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Old 10-17-2011, 07:48 AM
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Originally Posted by triumphrick View Post
I too agree that five year old batteries should be replaced. You can also add an onboard battery charger that will keep the new ones up to snuff.
I really dont think you will need a battery switch if using a pair of 12v for the 24v trolling motor and a separate 12v for the starting battery. What would there be to switch? Just to turn them off? I don't feel a switch is warranted.
Your thinking is right in that the previous owner wasn't thinking properly as he seems to have reversed the batteries.
I agree there doesnt need to be a switch between the trolling and starting batteries. I was meaning that if he did use 2 batteries for the motor and house to put a switch instead of wiring them together since when he is using the trolling motor his engine wont be running but his electronics likely will be. This way he could switch the batteries to 1 and still be able to fire the motor even if he was trolling around for a while. This may seem like overkill to some but I am a power nut cause nothing sucks like being somewhere and not having enough juice to fire the motor!
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Old 10-17-2011, 07:53 AM
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Originally Posted by Bronson View Post
....... Can I put the two "MS" batteries from the trolling bay to the rear and wire them in series to give me some backup there (two batteries for starting)?.
If you wire the batteries in series (assuming that they are 12 volt batteries), you will have 24 volts and blow up all your electronics and any electronics on the motor.

I suggest learning more about electricity before you do anything other than direct replacement of existing batteries (one at a time, making notes of where the wires go). You can buy books on boat wiring at west marine or amazon.com.

Or, pay a pro.

Last edited by rwidman; 10-17-2011 at 03:14 PM.
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Old 10-17-2011, 09:48 AM
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Thanks for all the replies.

I do have an installed charger (Charge Pro) for the two trolling motor batteries.

Is it common that the trolling batteries and the house/starter battery are two seperate systems? Does the outboard alternator (115 Yamaha) charge just the starter battery or is it wired to the trolling batteries as well?

If the starting battery is also the house battery (everything except the trolling motor) should I get a dual purpose battery as a replacement?

Again, probably stupid questions for most of you and I probably will hire and expert. Unless of course the Hull Truth experts can educate me!
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Old 10-17-2011, 10:43 AM
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Originally Posted by Bronson View Post
Thanks for all the replies.

I do have an installed charger (Charge Pro) for the two trolling motor batteries.

Is it common that the trolling batteries and the house/starter battery are two seperate systems? Does the outboard alternator (115 Yamaha) charge just the starter battery or is it wired to the trolling batteries as well?

If the starting battery is also the house battery (everything except the trolling motor) should I get a dual purpose battery as a replacement?

Again, probably stupid questions for most of you and I probably will hire and expert. Unless of course the Hull Truth experts can educate me!
Yes it is common for them to be seperate when the trolling set up is 24 volt since the engine and other electronics are 12volt. If the trolling set up is 24 volt then the alternator on the motor is not charging the trolling batteries. If you are going to use a single battery for house and starting it would prob be a good idea to get a dual purpose.
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Old 10-17-2011, 01:56 PM
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Just replace the trolling motor batteries with new deep cycle batteries. Wire them back up in series like they are currently wired and buy a new starting battery for the boat. That way everything will be new and you will be good to go! The trolling motor batteries are seperate from the boat system which is why you have a built in charger for them. Make sure to leave it that way. I would not recommend using the old batteries that were on the trolling motor for your boat either since thay are not deep cycle but have been used as such meaning they are probably shot. "You don't want to be out on the water and find yourself with a dead battery and unable to start your boat." As for doing it yourself, replacing a battery is not hard to do. While you are at it check your wire and connections to make sure everything is clean. If not, clean the battery cables while you are changing out the batteries.

Remember, it is really a good idea to learn how to do these sort of things for yourself so in the event you find yourself having a problem on the water you will have some knowledge in how to troubleshoot.
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Old 10-17-2011, 06:40 PM
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Default Batteries

All of the above is good advice. My suggestion is to think this through carefully because what you want now may change later and you will have to change the set up. Research past posts for trolling batteries, you will see a lot, many complain of dead batteries.

Do your homework now.
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