AO Silver Member
Join Date: Mar 2003
Re: Battery Question
Clean terminals are very important as SEARs says, make sure they are clean. I don't suppose you saw the battery checked? I guess to do it properly it should be removed from your car so they should remove all corrosion before testing.
The 12.8 volts is about right for a fully charged battery.
The cranking capacity determines its condition (the current it can produce under a heavy load when the car is being started). So the only effect it could have on the system electrics is for the few seconds when you are cranking the engine to start it. The voltage will drop more than necessary under load. This may or may not affect the errors you have been seeing (normally vehicle systems are expected to operate at 9 volts or above). If you are not sure of the age of the battery, think about changing it anyway. How old is the car if its likely to be the original?
I'm in a similar position my battery was OK through the winter but its showing its age at about 6 years old, and the car is not used every day, so I'm replacing it early before I have problems.
'A business absolutely devoted to service will have only one worry about profits. They will be embarrassingly large.' - Henry Ford.