First,

Alon, there is no Optima dealer in my area, and after visiting their website: http://www.optimabatteries.se, and http://www.optimabatteries.com I couldn't even find an application for Optima batteries in Mercedes...

Next,

David, I used the old, "charge it disconnected and let it sit overnight, and see if it starts the car", and "charge it and let it sit overnight and check the specific gravity with a hydrometer", and finally the infallible "Have the Interstate Battery dealer check it under load" test. It failed all three...

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Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."