Question about 2004 Mini Cooper

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Battery Keeps draining

I have removed all cabin boot and footwell bulbs.
The car holds it charge when running so batteyr is ok.

The car does little milage, but something is draining the system.

Any ideas to identify the problem

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  • vukes Oct 29, 2008

    If I leave the car for a week while on vacation, I disconnect the positive terminal, and it will then be OK, but if I leave it on, there is a power drain, and the battery will be dead upon my return.  Mini needs to address this problem! What is the drain? Is there a fuse I should take out?

  • Robert McClure May 11, 2010

    how old is your battery, you might need a new 1



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Fit a battery isolator switch

Posted on Dec 06, 2008


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How long have u got to charge it for for 1st use because I charge it all day when I turn it on the next day the battery kept going down I'm still charging it

A new battery comes charged well enough to start the car, if it keeps going flat u have a problem either with the charging system or a power drain, so once car is turned off sonthing is staying on draing the battery. Or the battery could be faulty but very unlikely. To check the charging start car and put a volt meter on the terminals of the battery should be reading aprox 14.2 v if it only reads 12 something then u have a charging fault. If charging fine then have to test for a power drain and the easiest way to do that is to open bonnet or boot depend where battery is lock the vehicle up and wait about 20 mins for the car to shut down Ecus etc remove earth terminal off battery and put a 12v bulb from the earth terminal of battery and the earth lead if the light shines u have a power drain remove each fuse in turn remember to put it back after until light goes out then u have the offending circuit. Hope this helps

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Might be anything, but before going further I wish to check and clear three most common factors:
There are 3 most common reasons for the battery to drain.
You have to check these one by one.
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Start the engine, and with a multimeter, or Volt/ Ohm meter, set at 20V DC, measure the voltage between terminal (+) at the battery, and a good ground. The reading should be 13.8 V to 14.2 V. If this is O.K then you have to check the battery.
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