I have accenta alarm, cannot find model number, it was fitted 14 years ago. Problem now is beeping noise from box when passing sensors. I have opened box but cannot see battery, there is a small black cylinder shape with hole in middle I think the battery maybe underneath but cannot remove black cylinder without force and might break it. Ref. No. on black cylinder shape is
HCM1212A. 119KIJ. Can you please help
Brian Middleton, October 2017