"Ken" wrote in message
nk.net...
Our system battery has never been changed since installation in 1995. The
installers said it would need to be changed periodically but they never
followed up.
Are these batteries readily available and easy to change out?

Ken

It can be one of a hundred different batteries and dozens if different
systems so no one can give you an accurate assessment.

Radio Shack can order just about any battery you need.