Comments on: Secondary Backup Battery Replacement Instructions https://www.mercedesmedic.com/mercedes-backup-secondary-aux-battery/ Mercedes-Benz Repair Guides, Service, How To DIY Thu, 31 Aug 2023 13:49:25 +0000 hourly 1 By: Derek Carr https://www.mercedesmedic.com/mercedes-backup-secondary-aux-battery/#comment-37719 Fri, 28 Jul 2017 19:26:51 +0000 http://www.mercedesmedic.com/?p=3062#comment-37719 This is NOT instructions for the CLA250 Aux Battery. 1) the battery is in the engine compartment, not the trunk as stated and 2) the cabin air filter is NOT on the left side of the engine compartment. I’ve yet to find where my aux battery so I can replace it.

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By: Mercedes Medic https://www.mercedesmedic.com/mercedes-backup-secondary-aux-battery/#comment-7695 Mon, 06 Feb 2017 13:23:51 +0000 http://www.mercedesmedic.com/?p=3062#comment-7695 In reply to Ian buckle.

Yes, secondary / backup / auxiliary battery basically mean the same thing.

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By: Ian buckle https://www.mercedesmedic.com/mercedes-backup-secondary-aux-battery/#comment-4838 Mon, 30 Jan 2017 07:51:23 +0000 http://www.mercedesmedic.com/?p=3062#comment-4838 In reply to fanaticmb.

Hi fanatic. Just bought 2013 MB from auctions. Message on dashboard says Auxilliary battery malfunction’ Is this the same message you had. Also how much was the new battery?
Thank you
Grumpy1962

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By: fanaticmb https://www.mercedesmedic.com/mercedes-backup-secondary-aux-battery/#comment-635 Mon, 04 Apr 2016 20:24:37 +0000 http://www.mercedesmedic.com/?p=3062#comment-635 I had the Battery Malfunction problem on my Mercedes-Benz and replaced the auxiliary battery following this guide.

Error message gone. Thank you!

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