W211 Auxiliary Battery

bolidemichael

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S211 E500
What is the purpose of an auxiliary battery?
 

benlucas

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Rainham, Kent
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S211 E55 Brilliant Silver Metallic
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...
 

whitenemesis

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Aux battery simply supports the main systems battery should it's charge drop too low.
 
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bolidemichael

bolidemichael

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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?
 

whitenemesis

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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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