Feltwell
Member
- Messages
- 6,377
- Location
- Shropshire, England
There's a rechargeable anti-tamper battery in the external bell box, that goes off if gets no current from the controller. It can go off for 20 minutes at a time up to 3 times, depending on how it's been set up! You can just take the cover off and disconnect it- I had to do that, with ear defenders on, to a neighbour's alarm box at 3am one time. They didn't get it maintained, the lead acid battery in the controller was toast, so every time there was a power cut the bl@@dy external alarm instantly went off. Suffice to say that after some words, they replaced the battery.................Despite being on the edge of town, with said town lit up below us complete with Christmas Lights, we are on a rural circuit and our power went out Saturday morning for almost a whole day. We had eventually been told it would take until Sunday evening to fix, so spent a few hours on Saturday spreading the home grown contents of two large freezers amongst the freezers of some very helpful neighbours starting four doors down the road! That still left one very large freezer full of home grown produce deemed less likely to spoil. Power came back on this morning so that was a relief, although only after we found out what happens to our burglar alarm when the backup battery finally runs out - there are several bouts of beeping, each of which needs cancelling at the keypad downstairs. When the keypad finally dies, the external alarm goes off for twenty minutes!
The rechargeable battery in the bell box can be left disconnected if you want, it just means that if someone breaks into the house, isolated the alarm controller from the mains, opens the controller up and removes the battery, it will silence the alarm. I'll take that risk to stop any nuisance alarms! Makes it easier to isolate it all for maintenance as well.
I'm not a total alarm nerd, in-laws ran a security business installing them for many years, so I've fitted them to my own houses.