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?

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Paul
2004 E500 4matic; 72,000mi

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