Date registered: Sep 2010
Vehicle: 2006 E350
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I'm having the same issue with my 2006 E350. I replaced the main battery yesterday, took it for a short drive (5 miles+) and everything seemed fine. But this morning, the battery warning light was on again. On restart, it went away. I guess it's the aux battery that's bad.
No local shop seems to carry it but I did find:
Is this the correct battery? Also, is there anything else I should check? I'm fairly handy with cars but we got this car not too long ago, used, so I haven't done anything aside from the wipers and now the battery.