Non-MB Question ... Difference between Marine and Automotive Batteries?
 

I am replacing the battery in my 200 HP inboard/outboard boat ... if there is a big difference in price between "Marine" and "Auto" applications, what does this represent in content?

Is there a real difference for a given casing size? My is a size 24 (pretty standard auto size) and has 400 cold crank amp rating ... what is real issue if I simply replace it with an auto battery of the same output?

As a former sailboater, my understanding is that marine batteries are built to have a decent service life where they sit for a long time between uses. They also can better handle a long discharge/recharge cycle - like when you anchor and run your lights and water pump, and then start up in the morning and go.

The information at the following WEB site may be of interest:

http://www.windsun.com/Batteries/Battery_FAQ.htm

Marine batteries are deep cycle. An auto battery in normal use loses a small percentage of its charge each time you start the car at which time the alternator recharges it right away. Marine batteries often are deeply or totally discharged before being recharged. The Marine battery is designed for this application.

Have a great day,

Thanks to all. The website was informative, as well.

As usual, it makes sense, as I tell my two sons, "to know things."

I have a feeling that the battery application in my small, limited HP boat (with converted auto engine) will not make much difference. But, since there is only a small difference in the cost, why sweat it.