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Old 24 February 2018, 20:11   #1
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Tohatsu 50hp Specs calls for a 850 CCA Battery but will a 870 MCA Work

Marine Dual purpose Optima battery 34M is rated for 750 CCA/870 MCA will this still be OK for the new Tohatsu 50hp 4 stroke, specs say use a 850 CCA battery..

Will the outboard CPU still function correctly

I will not be using the boat below 50 degrees or 10 celsius




CCA = 0 degrees/-17 celsius and MCA = 32 degrees/0 celsius
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Old 25 February 2018, 07:31   #2
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I should think so, 750CCA will easily start my 3.6ltr diesel engine! Why you would require that for a small 50hp I've no idea...perhaps in the antarctic.
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Old 25 February 2018, 16:35   #3
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I should think so, 750CCA will easily start my 3.6ltr diesel engine! Why you would require that for a small 50hp I've no idea...perhaps in the antarctic.
The funny thing is they do say use a 1000 cca battery when in extreme cold conditions.

I just cant figure why such a small motor requires such a large battery..
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Old 26 February 2018, 06:37   #4
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Last tango just went through this with his new Merc 150, for warranty they made him upgrade from 650cca x2 in parallel which obviously is 1300ah cca. To 700cca batts. Also made him take pictures of the new batts in place or no warranty...be careful if under warranty.

Why they want it is probably to limit the chance of cold cranking pulling too many amps and things heat up. I.e get a warranty void free card
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Old 26 February 2018, 10:57   #5
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CCA (Cold CA) is the guaranteed rating at 0F(-18C), MCA (Marine CA) is the rating at 32F (0C). At 10C the CA will be even higher, but battery manufacturers may not quote the 10C figure. It is the guarantee that the battery voltage stays above 7.2V whilst cranking at that current for 30 seconds.

So unless you use the Rib in Artic conditions, it should be OK.
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Old 26 February 2018, 11:00   #6
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I think it is because the starter ring (the gear wheel that the starter motor engages with) is much smaller in an outboard motor, than in a motor for a vehicle. Therefore the starter motor needs to be more powerful to overcome the compression of the engine.
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Old 26 February 2018, 11:18   #7
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Last tango just went through this with his new Merc 150, for warranty they made him upgrade from 650cca x2 in parallel which obviously is 1300ah cca. To 700cca batts. Also made him take pictures of the new batts in place or no warranty...be careful if under warranty.

Why they want it is probably to limit the chance of cold cranking pulling too many amps and things heat up. I.e get a warranty void free card
I still don't understand why they wanted that seems pretty pointless that reminds me I need to go and reposses half my workshop from his garage
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Old 26 February 2018, 12:20   #8
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CCA (Cold CA) is the guaranteed rating at 0F(-18C), MCA (Marine CA) is the rating at 32F (0C). At 10C the CA will be even higher, but battery manufacturers may not quote the 10C figure. It is the guarantee that the battery voltage stays above 7.2V whilst cranking at that current for 30 seconds.

So unless you use the Rib in Artic conditions, it should be OK.
Yea I should be ok than, I don't boat unless its well above 60F or 16C, seems like these modern outboards and the electronics need large batteries now days, maybe its time to go lithium and throw away the lead weight..
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Old 26 February 2018, 12:24   #9
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DONT replace the Lead with a Lithium, unless you change the regulator for a Lithium on your Alternator and/or Charger. The charging profile for Lithium is much more complicated than Lead Acid.
Getting it wrong will result in a spectacular fire.
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Old 26 February 2018, 12:49   #10
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I still don't understand why they wanted that seems pretty pointless that reminds me I need to go and reposses half my workshop from his garage
It is a tick box excersise if you burn a starter up in warranty. I guess they get enough warranty repairs to merit asking for it or enough people say yeah my battery is only X and they say...sorry, no warranty. I seem to recall Honda count how many times an engine has started, don't know exactly why I know that but probably clyde outboards mentioned it at some point.

Clyde outboards told me mercury were getting REALLY pernicity with the PDI and installation etc over last 24 months or so and a lot of new engines are knocking about mercury won't warranty anymore due to technicalities....hence last tango having to jump through hoops and send pictures of everything for their files.
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