Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Mentioned: 9 Post(s)
Quoted: 343 Post(s)
What had taken me into checking out how to the measure the health of a modern car battery was this.
The 2004 factory-fitted VARTA battery was a 100AH lead-acid battery; each cell with a removable cap for adding distilled water. It was still functioning well in 2012 when it was replaced with another Varta 100AH, 830 CCA, this time a sealed calcium design.
This winter, with my car mainly used for short journeys I have been using a maintenance charger overnight to keep the battery in tip-top condition. However, the voltage at the terminals only reaches 12.4v - never 12.6v - which I have always thought to show a fully-charged battery.
Now this video teaches me that my battery's health has nothing to do with the terminal voltage. It is all to do with the cold-cranking current available, as measured on this special instrument.
Last edited by keyhole; 01-24-2015 at 03:23 PM.