Outboard starting battery specs?

[gshaw]

Does anyone have a chart to show what the recommended starting (cranking) amps for a battery is for a given horse power outboard? say 70-80hp 2 stroke ?

What is the best battery for starting out there (not deep cycle) e.g the Optima Red or Blue? any other recommendations?

 

[PaulGooch]

Does anyone have a chart to show what the recommended starting (cranking) amps for a battery is for a given horse power outboard? say 70-80hp 2 stroke ?

What is the best battery for starting out there (not deep cycle) e.g the Optima Red or Blue? any other recommendations?

Don't worry about fancy calculations for battery sizes, just fit a 110ah leisure battery. Will be more than you need as a minimum and have ample to run the average electronics.

It's good practice to have a secondary means of starting the engine. Either a second battery, or a pull cord. In the case of a pull cord, make sure it's in good condition and you can easily start the engine with it.

 

[VicS]

For a two stroke that size around 450 CCA will be adequate.
An ordinary engine starting a battery with a capacity of around 60Ah will probably be suitable.

Leisure batteries are not all suitable for regular engine starting so unless you want to power auxiliary equipment from it a starter battery will be a better choice. ( mine current one has no CCA rating, its predecessor did)

Consider Optima (Red top for purely engine starting) and Redflash batteries if any of their other features such as unspillability or compact size is important.

If portability is an issue do not choose a battery larger than necessary.

Does the owners manual make any recommendation on battery size. I know Mercury and Mariner do

Have you looked at on line owners manuals generally for that size of engine .

Make sure you can recharge it fully after use.

 

[Assassin]

Check with the engine manufacturer, send an E-mail and give the engine type and model number, they will provide you with two essentials, the CCS's and the battery rating in amp/hour. Many operate within a range, so you may get two ratings for CCA and A/H, these will be the lowest and highest recommendation; anything between the figures are fine.

Personally i find Exide good value, reliable, and have a good technical department who answer all queries.