Im reading your comments Acorn and smiling. I had a call tonight from a person in Ireland with an alarm problem. They hadnt had it serviced for over 15 years and wondered why the battery had gone faulty. Umm the lady said i thought the batteries are rechargeable, will it still be in warranty if its failed.
I appologise if you are they lady reading this by the way. Acorn is spot on, regardess to what you the general public have been told. The life span of a Yuasa sealed lead acid battery is between 3-5 years, If your panel is in a hot airing cupboard it will be less.
Gave me a smile tonight though.
Regards
Nick 07842 480037
Nick, January 2010