I have a 2002 C320 with 40,000 miles. This AM, the battery was completely dead and has been lagging a bit lately. Doors wouldn't even open and car was blocking my other car. Looked at this Forum and called MB Roadside Service even though car was out of warranty and I get oil changes locally. They had all info and local service was here in 30 minutes and installed a new battery. $155. Service call was complimentary because I had at least $100 of service at dealer in last 18 months. Only reset of electricals consisted of turning the steering wheel to the left and right stops twice! Considering price of aftermarket battery, this is surprisingly good service.
I can't believe that I am wasting my time replying to these Costco smurfs, but they are MB owners so I will. First, You will not get a Mercedes grade battery, (power and size) at Costco and not for $80.00, not even for $142.60 (which is the catalog price at my Costco-not in stock) that is even close to the dimensions and power needed. I did check them out. It is an uncommon battery and even big box stores are unlikely to have more than one in stock. It is likely if they do have one, for it to be on the shelf for more than 3 months, (because of low demand for the item), which is also a no-no.
Secondly, my battery was dead flat and wouldn't even take a charge. I could not even turn the key or open a door. I had to use the manual key to get in. I have a two car garage and the car was directly behind my other car. A jump start from my daughter's car wouldn't keep the car going. It was Saturday morning and my local MB store was closed (Metro Detroit).
Third, upon examination it appeared that I would need to have some extension tools to get at the retainers holding the battery in place, just to get it out and take it with me for testing and disposal.
A sweep of (exact capacity) battery cost comparisons varied from $139.60 to $353.00 for a replacement. Battery disposal would be $3.00 if I have to pay. Extension tools , (if I find them in 2 hours) would be $10.00. MY time allotment would be the balance of the day and the wrath of my wife who could not get the other car out for her planned excursions, along with the usual diatribe of why do we have to have MB cars that require all this stuff....and my daughter pissed because I am using her car to gather all these parts.
To have MB Roadside come within a half hour, test and take out the old battery, put in a new proper one, reset the ESP (which is all that didn't work) for $155 was a delight!
By 1 PM, that problem was forgotten and I was out in the car looking for proper body bolts for the power windows of my 1973 Firebird.
NOW, DON'T TELL ME I CAN BUY THOSE AT COSTCO TOO!