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Well I decided to call the battery tender manufacturer Deltran and run some questions by them. I was told that the unit will switch off charge (red light steady) to a blinking green light (charge at 80%) at 14.6 volts. The steady green light (float mode) at 14.9 volts.
He did recommend to use the higher amperage unit (plus) for a boxster.
Thought I would pass this on
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