Hi All, VCDS pinged up low battery on the alarm siren (Bosch),and upon testing had a very low output noise, so I thought I would cut it open and have a look inside to see if it was the common problem of the batterys leaking. So cutting round the seam of the unit with a junior hacksaw it came apart, the batterys had leaked but on cleaning the PCB it hadn't damaged the copper tracks,this unit was different to my last one where the batterys leaked all over the components and rotted the tracks etc