Quote:
Originally Posted by Daox
You should buy a scangauge or at least put a voltmeter on the battery to monitor it.
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Seconded! And thirded.
I see this point frequently overlooked by people who are either new to engine-off coasting OR disabling their alternators.
You NEED to monitor battery voltage to prevent damage!
10.5 volts is the absolute lowest a 12v battery should be subjected to with a load on it. Below that, you risk irreversable damage and shortened battery life. Deep discharges may save gas, but buying a new battery every year kind of negates that!