No question FLA batts do not get the best treatment on cruisers as the last 15% or so takes "forever" to get charged , although solar helps.
A 100% charge daily is hard to keep up.
The easy way to have FLA "live longer and prosper" is to oversize the bank by 15% to 20% so after years of normal use /abuse they will still perform as well as a standard sized bank did when new.
7 or 8 years instead of 5 or 6 is easily worth the 15% extra the extra bank size costs when new.
An SOC meter is also a great help.
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