The very best
marine batteries are the
AGM batteries by "Lifeline"
...we had to replace our bank of batteries in our previous s/v 8 years ago..and I think they are still working by all reports...they were pricey...but when they were initially delivered...one was slightly bulgy ..so they "Lifeline" sent us another one...and told us to keep the suspicious looking one, no questions asked. The point of this post is that the suspicious looking and slightly bulgy
battery went to
work on our ranch and is still being used on the ranch...sitting out in the
weather used to run our submersible
water pump...this same
battery is still working fine w/no special care provided...so gotta say, when it comes to batteries...price vs. serviceability and convenience.. they are all expensive and heavy to lug around so IMHO its better to buy what is gonna last awhile.