Battery Question
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 73
Likes: 2
2003 E320
Battery Question
I checked the voltages of the aux battery when I got home last night and then again this morning after the car sat. Last night the voltage was 11.86 and this morning 11.7. Does that seem normal?
MBWorld Fanatic!
Joined: Jul 2006
Posts: 1,779
Likes: 11
From: Long Island, NY
2004 E320
A good battery should be between 12.4 to 12.6v at rest, If that's the original aux batt, I would consider replacing it.
Open Circuit Voltage of 12V battery after car is off for one hour Relative charge
12.6 V 100%
12.4 V 75%
12.2 V 50%
12.1 V 25%
Less than 12 volts Dead
Open Circuit Voltage of 12V battery after car is off for one hour Relative charge
12.6 V 100%
12.4 V 75%
12.2 V 50%
12.1 V 25%
Less than 12 volts Dead
Senior Member
Joined: Apr 2013
Posts: 271
Likes: 17
From: NYC and LI
2004 Mercedes E500, 2008 Mercedes ML350
A good battery should be between 12.4 to 12.6v at rest, If that's the original aux batt, I would consider replacing it.
Open Circuit Voltage of 12V battery after car is off for one hour Relative charge
12.6 V 100%
12.4 V 75%
12.2 V 50%
12.1 V 25%
Less than 12 volts Dead
Open Circuit Voltage of 12V battery after car is off for one hour Relative charge
12.6 V 100%
12.4 V 75%
12.2 V 50%
12.1 V 25%
Less than 12 volts Dead
