W211 Auxiliary Battery

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bolidemichael

MB Enthusiast
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Joined
Apr 19, 2018
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1,119
Location
SW20
Car
S211 E500
What is the purpose of an auxiliary battery?
 
Problem ?
 
Disconnected mine recently to clean around it. Car still started & electrical stuff I was using worked e.g. a/c, c/l although got the end-ofthe-world angry red 'visit workshop' alert. Once reconnected it disappeared...
 
Aux battery simply supports the main systems battery should it's charge drop too low.
 
So it is reasonable to assume that this has been propping up the main battery whilst it has been mostly sitting around waiting to get painted correctly for 10 weeks?
 
With ignition off the aux is out of circuit, only once the car is switched on and the low charge in the system battery registered will it come online.
 

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