It's a cr123 battery
Not easy to disable as there menu system is stupid
Pull wallet out call and engineer have it serviced and protect your home
Or rip off wall yourself and put in bin
I was once given a big box of books to take to the tip.
I signed loads of 'em & dropped of charity shops
Cliff Richard, Stevie Fry, Jilly Cooper, ect... All use the same sort of marker pen