Also I use a carcoon to protect my classic car when not in use. This has a battery management system that feeds a constant trickle charge. Can this be used with the calcium battery type?

Will battery HCB072 fit in my EType Jaguar V12 DHC?
My current battery is 261(L), and 171(D)

I have one of these batteries which was purchased in january 2009, when initially fitted it was brilliant. Now if i do not use my car for 3 days the battery is too flat to start my car. The alternator charges at 13.4v with all consumers turned on (blower, lights, heated window etc), there is a 0.03 amp current draw after 2 minutes of locking car up. The battery was tested in spring and found to be 73% charged (after being driven for 5 hours solid during daytime, ie. no lights on) which seems poor to me. The vehicle is generally in daily use, is it possible there could be a defective cell or two in the battery? Also cannot find receipt but can track exact date by transaction through bank.