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Battery Issues 840??

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HolmeValley840 View Drop Down
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    Posted: 02 Dec 2018 at 4:05pm
Hi All - I have been having issues with starting my '96 840 after is has been sat for a short time...

Its kept in a garage and if it is left for about a week the battery goes flat...it jump starts with no issues.

The batteries are not old and good quality.

Any ideas - I am not technically minded, if anyone is local to the Holme Valley and is, and can spare some time I would be grateful, that goes for any help or guidance generally!

Many Thanks

Rob


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Mike Fishwick View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Fishwick Quote  Post ReplyReply Direct Link To This Post Posted: 02 Dec 2018 at 7:23pm
Try measuring the discarge current when the car is standing - it may be quite high, as the 8 Series has lots of electrical devices on it. 

Compare this to the official discharge rate - if it is is within spec, perhaps a small battery charger would be worth buying, to keep the batteries on float charge. 

If the discharge rate is higher than the spec, you will have to pull fuses out to locate the main source of drainage current.  Perhaps your car has an after-market stereo system, or a tracker which needs a new battery.

Remember that a rate of only 0.03 amps amounts to a loss of 22 ampere-hours per month - even with a fullly-charged battery this will drain the battery in about 3 months.  If the battery was not well-charged when the car was stored, it will take a shorter period.
A Z3 is not just for Christmas - it's for life!
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