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[lightfj]

Just to add to the interesting talk on the powersounder, mine just went off last sunday afternoon. No apparent reason but stopped after a few minutes and went off again in no time flat. It continued to cycle and was not stopped by unlocking the car with the remote or even turning on the ignition or starting the engine. I removed it and lasted 3 minutes continuing to cycle before it died. I have since opened it up and it has Varta 3.6V 140mA batteries. One battery measured 0.40V and the other 1.90V. The car is a 2002 2.2 dti elite and has done 108K. Could the imbalance of the battery voltage have anything to do with it? Following Dave DND's exhaustine research details I offer this as additional info for his archives. If onebattery is not holding its charge compered to the other could it cause random triggering of the alarm?
Am going to replace both batteries and see what happens.
Thanks to all who post on this issue -its interesting.

[Kevin Wood]

The batteries are simply connected in series so an imbalance wouldn't cause any failure mode a failed pair wouldn't, IMHO.

Any signs of battery leakage?

Kevin