I was initially going to use a title something like, great video for introduction to boat batteries, but at the half way point, the presenter - Jeff Cote from Pacific Yachting Systems - gets more technical and more experienced boat battery type people may still benefit. If this is you, jump to about half way through.
If you are a newbie and want a good intro to boat batteries, the pro's and con's of each, start from the beginning.
This video was taken from a seminar I missed attending as snow moved in and affected transportation back on a BC Ferry from Vancouver to Nanaimo so I couldn't make this seminar. Glad I found this. I just bought but not yet installed six 12 volt Fire Fly batteries on my boat, replacing relatively new golf cart batteries.