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Old 29 April 2014, 09:41   #1
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Country: UK - England
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Make: Bombard Aerotec 380
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Leisure battery for 30hp outboard?

I need a battery for my sib to start my Johnson 30hp 2 stroke and will be running a fish-finder unit off it. I did search the forum but most are for much bigger outboards and more kit running of it...

Will a normal 75 ah leisure battery those used for camping work, one like this
Numax 75AH Sealed Leisure Battery | GO Outdoors

Ideally I want a smaller battery if possible but have no idea how much power an 30hp outboard needs. The sonar unit uses very little as I use to run mine on a 12v 7ah and will last all weekend.

Any recommendations on batteries would be greatly appreciated.

Regards.
Chris.
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Old 29 April 2014, 09:55   #2
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I am sure that is about the same size I used on my SR4 with a Evinrude 50 on the back, never had any starting problems.
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Old 29 April 2014, 14:25   #3
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Thanks Seaflyer.

Will a car battery also work, they seem a lot lighter. The outboard will charge it while underway... Think the car batteries are around 35-45ah?
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Old 29 April 2014, 14:29   #4
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Car battery will be fine as long as you get one with enough CCA for your engine. Cant imagine a 30hp 2 stroke needs much grunt to spin it, maybe try one of the smaller car batteries that seem to be all the range in superminis.
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Old 29 April 2014, 14:44   #5
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i start a 120 using a leisure battery. how about a large motorbike battery? do you also have a pull starter for if battery were to fail?
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Old 29 April 2014, 14:46   #6
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Quote:
Originally Posted by Landlockedpirate View Post
Car battery will be fine as long as you get one with enough CCA for your engine. Cant imagine a 30hp 2 stroke needs much grunt to spin it, maybe try one of the smaller car batteries that seem to be all the range in superminis.
Something like this
Halfords | Halfords 12V Lead Acid Car Battery HBO56

I have no idea what the CCA requirements for a 30hp 2 stroke are.
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Old 29 April 2014, 14:53   #7
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Originally Posted by Festinghouse View Post
i start a 120 using a leisure battery. how about a large motorbike battery? do you also have a pull starter for if battery were to fail?
Yes, I will have a pull starter.
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