Thanks for everyone who's trying to help
Well till now, i'm facing same problem, yet I didn't make sure the battery cables are tighten, but this thing for sure i'll do.

I have a question for Inspector1. How can the starter draining more AMPs now? I mean the car was normal, and it's all of the sudden having these symptoms! I would have expected this symptom if the battery was changed, or starter was changed. Am I right? Or I might be missing something!!!

For the 1993 E220, I guess most the books in US are for US & North American models. Mine is European model. Maybe this is the reason. It has W124 Engine.