2005 500SL question

I have an alarm that indicates that I should go to the workshop and a picture of a battery. I assume that I should replace the battery but since this car has 2

12Volts batteries, my question is which one?
Reply to
John
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Maybe one now and the other one next week.

Reply to
John

Do a load test on each battery... local auto parts will do them for you free.

Reply to
Tiger

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