|
Voltage |
Engine off. |
Engine Running |
|
15V+ |
|
Overcharging. Your battery
will overheat, boil the electrolyte out and die. |
|
14.4V |
|
Battery charging quickly,
this is a healthy electrical system. |
|
> 13.8V |
Overnight charging voltage.
If charge remains on the battery for more than a few days,
electrolyte will eventually boil out. |
|
|
13.8 V |
Battery is connected to a
good float charger. At 13.8V, the battery will be happy
indefinitely. |
Battery charging slowly,
this voltage is easy on the battery, and will give you a full
charge, but not very quickly. Good systems go to this voltage after
the battery has been charged. |
|
<13.8V |
|
Marginal charge. Battery
will most likely not be fully charged by the end of your trip.
|
|
12.65V |
Fully charged, ready to go
|
At 12.65V or less, car is
running off battery, not alternator. Your battery will not get fully
charged. Battery life is short because it never gets fully charged. |
|
12.45V |
Battery at 75% |
|
|
12.24V |
Battery at 50% |
|
|
12.06V |
Battery at 25% |
|
|
11.89V or less |
Flat. |
|
