Just out of curiosity, is the new battery you bought a sprial cell type or regular type?
If my battery goes dead, its an interstate already as it came in the car, I'll probbaly end up replacing it with one of those spiral cell optima batteries.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.