I have to replace the battery on my 2007 C230 Mercedis Bents. According to Hayns Repair manual book you have to use small, low current 9 or 12 volts so called Computer Savers. It is usually plugges into sigaret lighter before you disconnect the old battery and install the new one. It will prevent computer on board to loose "security alarm codes and ( maybe, but don't count on it ) PCM memory". I wonder whether some one out there has the experience to change the battery and could tell obout it?
Another question is about several Computer Savers available on Amazon. Ther is no information about compatibility of these devices with car models. So, if someone has the information please share.
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