Guy,
There is an adjustment potentiometer inside that sets the mid range position for battery indication. When a pot sits in the same position for a long time (years) some oxidation will build up on the wiper and change the resistance value thus changing the indicated value. Depends on climate/humidity how much oxidation occurs. So 14 happens to be your 'standard' value for a fresh set of batts and it will drift higher from there as the batts decline. I wouldn't worry so much about the absolute value as it can be changed by a simple adjustment during calibration. Batts last a very long time in the Pentax V. unless you are using it heavily. From what you say it sounds like the unit is still in calibration. A standard gray card on a bright sunny day will confirm the 'Sunny 16' rule and assure accurate readings.