Mercedes S320 - "battery disconnect alarm"

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geoffers - 03 Apr 2007 08:27 GMT

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.

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Me - 03 Apr 2007 19:50 GMT

>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
[quoted text clipped - 8 lines]
>
> Many thanks from a newbie.

Do you mean the burglar alarm fired when you disconnected the battery? Odd
if it was not activated.

Where are you keeping the car, would you have the option to connect a
trickle charger to keep the battery not running flat?

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Tiger - 05 Apr 2007 17:03 GMT

First of all... running battery flat is bad for battery. It will
dramatically shorten the life of the battery. I suggest you replace that
battery for time being.

At the same time, I'd hook up a trickle charger to the car. That way,
battery is always fully charged but not overcharged. Get good trickle
charger that has microchip to prevent overcharging. There are many of them
at all different prices.

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