W212 Aux Battery Replacement Howto - Mercedes-Benz Forum
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post #1 of 2 (permalink) Unread 05-22-2019, 10:17 AM Thread Starter
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W212 Aux Battery Replacement Howto

Quick howto using an alternate battery:

Time, this is about a 15 minute job. 1 on a scale of 1-5.

Parts Needed

A0009829308 - Facotry battery $160 or more at your stealer, or

Yuasa YUAM6RH4H YTX14H-BS ~$70 shipped via Amazon prime.

or a gerneric YXT14-BS/CTX14/14-BS size battery ~$50 from Amazon.

Tools needed

10mm wrench

Drill and Bits if using Yuasa Battery or non vented alternative

-Open trunk, lift up floor

-Remove vent tube from battery

-Unscrew 10mm negative bolt and remove negative battery terminal, tuck to the size

-Remove battery cage bolt

-Lift cage up

-Remove positive terminal cap (lifts up)

-Unscrew 10mm positive terminal bolt and cover lead with rubber glove or plastic baggy and rubber band

-Remove battery

-If the replacement battery does not have a vent, you can drill one, this is your call, I personally prefer to vent hydrogen gas rather than keeping it pressurized. The manufactures obviously recommend against this, but the factory AGM is vented for obvious reasons.

-Replace in reverse order.
-The factory bolts work in the Yuasa but are a bit hard to start, I used a bit of the cardboard to lift the nuts in the terminals up for them to catch.

Two weeks later all works great and wallet is $90 heavier than getting the OEM battery. Yuasa batteries are made in the USA and are shipped dry. They are a good quality alternative and are not stale from sitting around.

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post #2 of 2 (permalink) Unread 05-23-2019, 10:45 AM
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I paid $111 for MB battery with lifetime guarantee from fcpeuro.com
Those batteries don't last more than 4 years, so I think I will use the warranty at least once.

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