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I have discovered anecdotally that as long as you use quality deep cycle or agm's and don't go below 50% you get many many years life out of them. enough that you can't tell the difference between just using it as a starter battery.
1 decent unit will run my car for a week so my plan is to use 2 so neither goes below 50% and charge it up once a week.
daily in the winter since the blower and headlights will get far more usage.
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