Back in July or August, the C230's battery died on a Saturday night -- fortunately right in front of my apartment. I called on Sunday morning, about 6:30 (originally I was going to get a jump from AAA, then drive to a parts store for a battery -- but thought better of it) and got someone right away. The driver came out about 8:00 am, removed the old battery, swilled out the compartment with some baking soda and water I mixed up to get rid of some corrosion, then popped in the new one. He also resynchronized my keys, windows, and moonroof.

Cost was only the price of the battery, and on a Sunday morning, too. So the dealer doesn't need to be open.
.

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-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
Formerly:
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino