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Old 03-01-2021, 07:18 PM   #5
bligh
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City: Santa Cruz, CA
Vessel Name: Concerto
Vessel Model: 1980 Cheoy Lee
Join Date: May 2013
Posts: 1,531
What is different about them other than the "M"?
Quote:
Originally Posted by fgarriso View Post
Along with the group-size numbers, you might see letters printed on your battery. For marine applications, look for group sizes indicating the letter “M.” These batteries are designed for watercraft applications.

Although you may find the right group size for your vessel, don’t use a battery without the “M” designation. The internal construction won’t work in the long run for your boat. Batteries will decline with rapid ease. Don’t leave yourself stranded with an improper battery.
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