Hi Ray, £100 for a call out and replacement battery, Ray you were robbed. The Yuasa 7amp sealed lead acid battery the panel requires will cost you about £15 from screw-fix, the problem is this. The 9800 has a programming option, where if you take off the lid of the panel, it may require an engineer reset. It is impossible from my end to advise you. The reason why your battery has failed again so soon, is at a guess, the control panel is probably in the airing cup-board or some where fairly warm. Batteries hate heat and their life is seriously reduced by it.
I would personally remove the lid, we can always reset it over the phone if you get stuck.
Regards
Nick 07842 480037 Engineer with 25 years experience
Nick, February 2010