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Flat Battery, 1.5 Amp Draining


pauljoanss
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Having battery trouble, keeps going flat overnight, it may simply be a dud battery (5years old) but during my failed attempts to fit a new one (I ran out of time), I noticed sparking when reconnecting old battery. Thought this a bit strange because nothing switched on, connected meter between terminal and live lead, it measured 1.5 amps.

Now I know the basic systems of the car will be taking some power but 1.5 amps sounds very high to me, although because only 12v, I suppose it is only 18 watts. Do not want to fit brand new battery £70 if the problem is somewhere else.

Is this "normal" or have I got a problem.

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Only proper way to check current drain is with bonnet down (or switch bridged) , locked and left for minimum 30 mins. Then you can assertain wether you have a problem or a battery

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I have just done some more measurements and the drain is 1.8 amps at first contact, at this point there are a few humming noises from the dashboard, after about 10 secs the noises stop and the drain settles down to 0.8 amps eg about 10 watts.

Is this ok??

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Not if it it stays that high when locked and left,

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Cannot measure when locked, battery must be connected to lock, if then disconnected, the alarm goes off as soon as the meter connects between battery and wire terminal.

I am beginning to think a drain of 0.8amps (10 watts) may be normal. Tonight I ran the car stationary for 45 mins to charge the battery, then disconnected it overnight. if the battery is flat tomorrow then confirms a dud battery.

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how are you measuring the amperage? are you running in serial or parallel with the battery, and when are you doing all this testing?

Have you gone fuse pulling yet?

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