What battery voltages should you see

I suspect the 14.8 was put there to prevent users from panicing when they did see brief high end reports. Newer vehicles with headlight delay, security systems, etc.. will use up some battery charge after the charging system stopped. So if you run out there and fire it up, turn on, heat defrost and rear defrost, and seat heaters, and on and on, a high voltage could be seen for some length of time.