There is "something" draining the battery (assuming the alternator checks good). I haven't had my Disco long enough to notice any problems like that, but my experience over the years with older cars and newer computer controlled cars shows me that a car with a good charged battery can sit for several weeks and still turn over and start, unless there is something constantly draining the battery. Things to look for (simple things) are an under-hood work light that stays on, glove box light that stays on. Aftermarket radio wired wrong, so always pulling power, etc.
Of course your clock (if you have one) will always draw a miniscule amount of power, really a trivial amount not to be concerned with. Don't discount the simple things, it is not always a complicated problem.
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