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[Migv6 le Frog Fan]

Don't know how we ever managed without it. 

[TheBoy]

Apparently I do not need a new battery....

"Current MB's use the alternator differently to older models.

 Most have variable output alternators to help reduce fuel consumption.

 In most cases once a battery is fully charged they hold battery voltage between 12.6v-13v to reduce fuel consumption. If you apply the brakes then the voltage may increase to as much as 15v to recoup the "free" energy, if accelerating then it may drop as low as 12v. The engine ECU determines what voltage it wants to maintain at the battery based on load/temps/electrical consumers etc.

 All Bluefficiency models have this, and most other current models."

A similar scheme on the Jag is clouding the issue on whether or not my battery is shagged, as the engine ECU controls the alternator output, based on what state of charge the Battery Monitor ecu thinks the battery is in...  ...and this is easily confuddled by connecting a charger direct to battery 

Now I'm using it a bit more, most of my annoying electrical gremlins have gone away, so might be battery capacity isn't great, or the drain is quite high.

Don't you just love these electronics on modern cars.

Keeps the tree huggers happy, and those like tunnie who think mpg is proportional to manhood size

[Doctor Gollum]

Don't you just love these electronics on modern cars.

Try a twenty year old car with an ecu for each bank