About 5 years ago I was given very clear instructions here by handymanjo to replace a battery on our 9800 alarm system that we inherited when we moved in some 20 years ago, a procedure I have repeated again recently. I have now decided to replace the aging bell box with a Texecom odyssey 1E, a job made easier by the fact we have scaffolding up at the moment. Can anyone here give me a step-by step idiots guide to removing the old and installing the new, particularly the order in which I should go about it?