New battery?




AGM for sure. I've seen folks post that they had good experience with Autozone and other house brand batteries. Cheaper and longer warranty than replacement MB one. I went with a Bosch from pep boys as it was cheaper with a rebate and has a 4 year replacement period.
Here are some good threads to look at:
https://mbworld.org/forums/e-class-w...4-battery.html
https://mbworld.org/forums/e-class-w...ml#post6508425






