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The auxiliary battery needs to be replaced. It's a smaller battery than the one you have in your trunk. If you take it to your dealer to have it checked out it will run around $300 to change, and on top of it they charged me $50 to diagnose the problem.
It is always safer to charge the battery out of circuit, Removal of one cable will insure you can safely charge without hurting electronics on board. Generally if your battery is already sufficiently charged it acts like a capacitor in the circuit and will prevent damage, but many battery chargers do not always put out a pure dc voltage and this can damage electonics.
In the 05 E320, the cabin air filter in under the hood on the passanger side at the back wall... There is a black odd shade square cover that says "air condtioner" "battery in trunk/back"... One nut holds this cover down, then it un-hooks.. The cabin air filter is attached to the underside of this black cover.
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