I have a W220 S320 CDI, it drains batteries very fast and now the key in the ignition wont turn, programmed a new key
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Installing a auxilery (backup) battery, work around solution for battery drain. - MBWorld.org Forums
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W215 - Battery Drain. Or is it......?! | Electronics and Audio | MBClub UK - Bringing together Mercedes Enthusiasts
![Installing a auxilery (backup) battery, work around solution for battery drain. - MBWorld.org Forums Installing a auxilery (backup) battery, work around solution for battery drain. - MBWorld.org Forums](https://mbworld.org/forums/attachments/s-class-w220/325621d1456279599-installing-auxilery-backup-battery-work-around-solution-battery-drain-20151205_223342_resized.jpg)