Cadillac Seville / Cadillac Eldorado Forum Discussion, Battery Voltage in Past Cadillac Vehicle Discussion; My battery with car turned off reads 12.2, can you guys tell me how much life it has left. Thank ...
The ONLY way to get some idea of remaining life is to have a parts store perform a battery load test. If the battery is 5 years old or more, it's on its last legs.
Because our cars place such a tremendous load on the battery with the key on, DIC voltage is no indication of much value. With the engine running, the DIC will show the present charging system voltage, not necessarily battery voltage.
The proper way to see true battery voltage is to disconnect the battery from the vehicle, let it sit for a half hour, then measure voltage with a digital VOM.
Thank you Sub for the information, I just wanted to get an idea since I don't know when the previous owner replaced the battery, when car is running, DIC shows 14.8, is that normal?
As posted, yes. An automotive charging system always maintains a slightly elevated voltage, even when the battery is fully charged. The voltage regulator ramps down charging amperage at full charge to only that value needed to run the car and accessories and "float" the battery on the system. My STS runs at 14.4 - 14.8 VDC day and night.
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
Re: Battery Voltage
There is really no way to predict when a car battery will die, any more than we can predict when you or I will die. Some last 4-5 years (closer to average) and I've seen others go 10 or more (not common). Generally speaking, somewhere between the two is probably average (though that's a fairly large spread) and that is determined by a lot of factors like heat. Batteries generally last much longer Minneapolis. than they do in Phoenix.