I have 4 optimas on my boat. 1 x D34 for starting and 3 x D31 for stereo, I use them because I get a good price on them mainly. I have a pretty small system compared to most of the guys on this forum ( 4 amps with 3700 watts total ) I am on season 3, have never had an issue with them and would recomend them to someone who wanted a solid battery.
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