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Merc 90 Repower - Battery
swist	#1  Posted on 08/15/15 - 5:26 AM
Member Posts: 38 Comments: 0 Joined: 09/04/13	So when repowering from a 2004 4-Stoke (carbs) to current model (2015 EFI), recommendation seems to be that battery have at least 1000 CCA capacity. Old one did fine on a 500 CCA battery. But I don't need to get this motor off to a bad start, so I did get a 1000 CCA battery. Can someone tell me where all this juice is going? Yeah, it's got a fancier computer and fuel injectors, but all else would seem to be equal - not enough to need twice the capacity. Or?
gchuba	#2  Posted on 08/15/15 - 8:26 AM
Member Posts: 1675 Comments: 0 Joined: 03/31/13	The manufacturer's CCA rating would be based on the amperage draw of the starter/staring of the boat. Gets hot quick.They do not want any overheating. Did you cross reference the cable sizing for the new motor? Garris
swist	#3  Posted on 08/15/15 - 8:28 AM
Member Posts: 38 Comments: 0 Joined: 09/04/13	Looks the same as the old.
Phil T	#4  Posted on 08/15/15 - 3:04 PM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	recommendation seems to be That's a bit squishy. I would have the dealer show you the Mercury documentation for the new motor that specifies the minimum cold cranking amp (CCA) rating. I recall it is the Verado family of Mercury outboards that require a minimum of 1000 CCA. Newer outboards are very fussy and will not start without a minimum amperage. The battery requirement is not about capacity but rather the ability to discharge high amperage over a prolonged period.