Quote:
Originally Posted by koolkat1973
So I repeat the entire process of locking the door, waited, then unlocked the door and the same thing happend. Voltmeter reading went from 12.4V to 9.1V within 30 seconds to minute after unlocking the car. Is this a sympton of a bad battery? I'm clueless at this point what the issue would be and how a battery can go from 12.4V to 9.2V within a minute. Please help.
Thank you.
Kiet
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You need a means of measuring the current (amps) draw when the voltage takes the plunge! Guessing ...
Your battery has NO stored-reserve to give so when you unlock the car ... the car systems power up and there isn't enough "juice to give"? 9/2v and everybody would be flaky! So you battery has no power reserve. Either the battery isn't charged or it can't hold a charge anymore?
What does the autoparts store think of the battery now? Do they think it is fully charged, can they tell? My guess is another fully charged battery and everything works great.
My guess is you do not drive many miles and the miles you drive are flat ... so little coasting to charge the battery.
Anyway another new charged battery and it will be fine for about as long. Could be the battery wasn't introduced-setup correctly to the X5? Could be a bad battery from the beginning but I doubt that.