Is your Reatta parked outside in the cold if so this will also impact the battery, especially if it is old and weak. Either way I always keep my battery on a tender from Fall to Spring if I am not driving it within 5 days.
Harry, The car is garage kept and the "constant parasitic drain" factor would be relavant in my case, the car is seldom driven, well has been barely driven even in the warmer months I will admit.
Auburn, I was not aware of the RAP relay and thank you, I will very definitely perform the test. Though after reading all the responses
here I think I should just drive her on a regular basis as weather permits. I am guilty of "Reatta Neglect" I fear.
By battery tender you mean a Trickle Charger I presume? Ive have used one during the winter but I think that particular battery was too far gone and she didnt fire up when I tried to start the car. I have a new battery since January and have fired up the car a couple of times and disconnected it each time, no trickle charger. I am not surprised the Allante has similar battery drain issues!
I will report back when I have performed that RAP relay test. Thanks to all