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Most electronics have built in voltage regulators that will keep the voltage down to what they want. I'd be amazed if your mound did not have that.
When the voltage goes below 12v you car battery is too low anyway (bad for it).
I just have a 12 deep cycle battery (that I used to use for camping) and it does the job all night with no problems.
Like others have said just keep it simple. There is a lot of useless info on the Internet about batteries (especially on 4wd forums); be cautious.
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