Leisure battery for 30hp outboard?

[Chris A]

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.

[Seaflyer02]

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.

[Chris A]

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?

[Landlockedpirate]

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.

[Festinghouse]

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?

[Chris A]

Originally Posted by Landlockedpirate

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.

[Chris A]

Originally Posted by Festinghouse

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.