Should my replacment battery also have a exhaust on it like the original?
If you mean a vent, yes
Is it under the seat? even in the trunk, that thing MUST be vented- see what problems are created when a MB owner tries to cheap out?
Search Mercedes-Benz E-Class Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercedes-Benz E-Class Experts