2012 S550 OEM battery
#2
#6
As to battery cost, it was thru a commercial account and not retail.
#7
MBWorld Fanatic!
Joined: Dec 2001
Posts: 3,419
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From: USA
W140 Mercedes S350, W221 S550 sport
No aux for refresh w221 10-13. The dealer states you shouldn't disconnect old battery and still keep 12 volts to the system. I didn't, and the only thing that happened is me losing the auto up function of the rear windows, which I told was normal. Quick fix is to just hold the button dor 10 sec to reset.