My father put an interstate - spiral cell battery (made by optima) in his car which he got from an interstate dealer.
The battery has the intersate name, and it also states that it is an optima battery.
Its a very powerful battery, and works very nicely for him.
They may or may not have an application for mercedes, I havent looked into it as my car came with a pretty much new insterstate battery.
But if I do need a new one, I will be looking into the spiral cell batteries. My understanding is that they work quite well, jump easier, and charge very quickly compared to a regular battery. It is also my understanding from a friend who is an optima dealer that you should not charge the spiral cell batteries with a charger but rather jump them with another battery. But this is only second hand knowledge.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.