car will not start with key on 2000 Jaguar S-Type

after overnite parking or not driving for a day or two the key will not start the car. thought was the battery so got new battery, worked for 2 days then again key will not start the car. what is the problem?

Asked by for the 2000 Jaguar S-Type
If your vehicle isn't starting due to "no cranking, no start" I would take it to your normal qualified service station and have what is commonly referred to a parasitic draw test to find out what might be the cause of a possible electrical component draining the battery your vehicle like all vehicle have a certain amount of keep alive memory drain but should not exceed 70 mA of draw after vehicle goes into its sleep mode. This is assuming your charging system is working properly. Good luck and best is wishes.
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