It depends...
Is it FLA or AGM?
Starting g or house?
Many FLA 8Ds are starting and not great for deep cycle
Does it have AH or CCA speced?
I'm not a big fan of 8Ds as they are HEAVY and expensive
If house a pair of 6V GCs are roughly equivalent to an 8D and very reasonably priced.
If you go AGM a pair of 6V GCs or 12V GP31s again roughly equivalent to an 8D
I have 3 East Penn 8D AGMs on my boat that have served me well for 8 seasons for both house & starting and still doing well. AGMs are capable of both starting and deep cycle very well unlike FLA. My plan is to replace each with a pair of AGM GP31s when the time comes.
Sams Club handles Duracell made by East Penn at attractive prices.
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