I have a 1996 Mercedes S320. I also go abroad several times a year for
2 months at a time. In January I decided to disconnect the battery (in the boot) to save it running down whilst I was away. However as soon as I took the terminal off the battery an alarm went off under the bonnet (presumably powered by a separate rechargeable battery?). I had to leave the battery connected and on my return this week it was as flat as a pancake!Can any body tell me, please, how to stop the "battery alarm" from going off when I disconnect in the future?
Many thanks from a newbie.