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Old 13-05-2024, 07:46   #1
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Recommendation for outboard battery

I'm working on fitting out a new dinghy + outboard and we selected one with a push-start. The outboard is a 20HP Tohatsu MFS20E, and the battery requirements in the manual are '20Ah, 330 CCA' .


I can't find anything that matches those requirements - the smallest battery above those at WestMarine was a 650CCA starter battery which seemed excessive for the use. Any recommendations on a better setup that may not be quite as heavy?
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Old 13-05-2024, 10:00   #2
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Re: Recommendation for outboard battery

Same OB with electric start and electric tilt. I went with an AntiGravity LFP battery. Works great. I mounted it in a small waterproof box mounted on inside of transom.

Antigravity AT12-BS Performance Lithium Motorcycle Powersport Battery with Built-In Jump Starting, 6.1Ah Replaces YT12, YT12BS, Ducati, Kawasaki https://a.co/d/8dawKVs
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Old 13-05-2024, 10:26   #3
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Re: Recommendation for outboard battery

Similar 20 hp outboard with electric start and tilt...

Deka/East Penn Outdoorsman 11U1L sealed "maintenance free" 12VDC battery, 350 CA, 410 MCA, works fine. (I think it's also the same one we have in our 22-hp (?) diesel garden tractor...)

I might look at Odyssey Powersports AGM batteries, to see if they have a likely candidate, whenever it's time to replace. Or Weebles' Antigravity option...

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Old 13-05-2024, 11:12   #4
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Re: Recommendation for outboard battery

I have a very small AGM to start my older Yamaha 15. It came out of a car as an audio booster. The label is worn off being in the dingy but it is 7" long x 7" tall and 3" wide. Has little 1/4" bolt terminals. Works perfect. At least 6 years old. Look at the Mighty Max ML 35. almost the same size as mine.
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Old 15-05-2024, 10:05   #5
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Re: Recommendation for outboard battery

Get a lawn tractor battery. I think they are $30 or less at Walmart. I used them on my Goldwing motorcycles for over 40 years. They can start a car too.
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