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2002 Mercedes ML320, Mercedes 190E 2.3L (sold), 2001 Mercedes c320(gone)
1,454 Posts
When I do not use it for my other cars. yes. I do not know the exact current draw when idle, but assuming 50 millamps, for 10 hours , it will reduce the capacity 0.5 ampere-hours which is negligible. It is my son's daily driver, and gets 50 highway miles of charging a day. So the battery is topped-up in no time.

If I do not use the car for extended periods of time, I would remove it, and also put the battery on battery maintainer.
Thank you!

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