w211 with NON AGM battery? electrical issues.
 

New to me 04 E500. auxiliary functions go off and on intermittently. Also, ESP popped on me. Both seem like battery issues.


Primary battery is an AC Delco with a date stamp of '6,' which I assume is '16 and not '06.

But... its a regular liquid acid, not AGM. These are supposed to have AGMs, right?

Secondly, missing bolt-down battery holder, and looks like PO damaged the fiberglass 'tub' the battery/spare sit in. So that batt is shaking around pretty good.



Aux battery- 8/18 date stamp.

I tightened up all connections. Figure I should have the primary tested somewhere? Or should I just go buy an AGM?

I really do not think it would matter if you used AGM or a regular flooded battery. If the battery is good it should not matter. On cars that the battery is in the passenger compartment under the seat, I do use AGM for those usually just due to the acid factor