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John,
When a battery has been taken off the charge, it is generally at that 13.2V mark and gradually drops as it loses charge. The specs of the mount suggest that is needs 12V and 3.5A (full load), so you will be fine with it as a power supply. You would likely see the voltage drop when the load changes (as I do by about 0.2V with 4A of full load for my mount and the same again with heaters on my 25A PSU).
I'd be hoping others here would say the same and instil you with confidence.
Joel
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