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Thread: Battery goes flat if left for 5 days

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    Default Battery goes flat if left for 5 days

    I have a 2002 vectra c 2.2 SRi I replaced the battery a few months ago as it was flat after a few days of not being used, as it was the original battery I thought it needed a new one . I have just left the car for 5 days and come back and it is totally flat. I have checked the current being drawn when it is idle and it appears to be 180ma but I am not sure if I am checking it correctly. I unlock the car disconnect the battery and connect the meter inline with the disconnected terminal and lead but is this the correct procedure to get the correct reading as there is the alarm, sensors and so much more on cars these days. I have check the obvious things like boot light and glove box light. How many milliamps should it draw when idle? Any help or advice would be appreciated

    Nick

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    Regular Member stanian's Avatar
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    Vehicle : Vectra

    Trim : GSI

    Engine : 3.2

    Year : 2005

    Mileage : 45000

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    I had a similar problem on my old Vecra B Sri, I had changed the stereo and fitted an autoleads adapter to keep my steering wheel controls. It turned out to be a faulty autoleads adapter i removed it and all was ok.

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    Vehicle : Jaguar XF 3.0D V6

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    You really should LOCK the car with the bonnet open and holding down the alarm plunger. Then connect a meter between the neg of the battery and the cable clamp, and then disconnect this cable. That way you get a true reading of the LOCKED current draw.

    It may need a few minutes to stabilise though.

    If it is at 180mA (ie 0.18 A) then a truely 60 Ah battery would last for nearly 14 days.

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    If you leave the car for 5 days with all alarms on the battery will go flat if the battery is older than a year. This is big business at all airports. if you ar in a secure carpark then lock car with the key on first stage only and that should sort out the problem.

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    The alarm will still set with one turn of the key. If you want to lock the doors without setting the alarm then you'll have to reach in through one of the other doors and press the lock button on the drivers door, then exit out the other door and shut it behind you.

    That aside, I've left my Vectra (nearly 3 yrs old with original battery) parked up for over a week before now and it's started straight away with no signs of a flat battery.

    Lastly, if you want to measure for current drain, it can take quite a while for the car's electrics to totally shut down due to the canbus network, which is still monitoring for something like ½ to 1 hour after locking up.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Quote Originally Posted by Bouncer View Post
    If you leave the car for 5 days with all alarms on the battery will go flat if the battery is older than a year. This is big business at all airports. if you ar in a secure carpark then lock car with the key on first stage only and that should sort out the problem.
    I would agree that batteries will go flat eventually, but after 5 days is too short a time.

    I regularly leave mine for 10 days with alram fully set and it starts no trouble, with an old battery too.

    Disabling the interior sensors will only do exactly that, the rest of the alarm is stilling working.

    Best to check battery current drain as I described above

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    I left mine for nearly 20 days and started on the button.

    Would reading fault codes indicate any shorts to ground. Have you measured the alternator to see if it's charging the battery OK?

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