Battery going flat...

[DevonGSi]

Anyone had the problem of the battery going flat after 2 to 3 days?

Its a 90Ah battery so something is taking 1 to 2amps when its switched off.

I have disconnected the cd palyer and amp and it still happens.

It does have a Thatcham immobilser on it and the standard alarm. This means it has 2 flashing leds but I cant see that taking 1  to 2 amps.

Any ideas?

[flash911]

same prob as mine, still not found the problem , mind you mine is just sitting waiting for the operation , so i just disconnect the battery

[Jimmy]

alternator mayby??

[Pedro]

Same as I had a couple of years ago - new battery sorted it.
All the voltage checks etc seemed fine, but it had a duff cell.
I bought one for an Omega V6 as it had a higher CCA rating - just the job!

Covered on here in more detail...........

[melinx]

Put your testmeter in series with the battery and start pulling fuses until you isolate the circuit that is pulling that high current; that will help to narrow down where the current drain is happening

[DevonGSi]

Just looked at the battery and its 540 CCA. Big enough?  Calcium based if that means anything.

[chris]

As Melinx says, put a meter set to Amps in series by removing a battery clamp and connecting one lead to the battery and one to the lead.

See what the drain really is, if there isnt any (or a few milliamps) then the battery is probably just knackered.

If theres lots then as advised pull out fuses until the drain goes away, then fix whatever that fuse was for.

Ive been there recently, in my case it was the 1 year old battery, and I had a real fight with the supplier to change it, I even had to discuss my tests with the battery manufacturer and have them confirm that they were happy to change it because the clown in the shop would not believe that his antiquated drop tester wasnt the last word in battery testing.
Replacement battery solved the problem.

Sorry for rant, I got very angry about the whole thing and need to let off steam.

[Johnraka]

Had this ages ago, turned out to be a faulty boot light switch, as I wasn't using the car every day the boot light was staying on and draining the battery, the only way I found out was when I dropped the back of the seat to get something out and noticed it was still on - drove me nuts for days!

[DevonGSi]

Had this ages ago, turned out to be a faulty boot light switch, as I wasn't using the car every day the boot light was staying on and draining the battery, the only way I found out was when I dropped the back of the seat to get something out and noticed it was still on - drove me nuts for days!

Thanks for the tip!  I will check tonight...if its not flat!