What is draining my Volvo 940 Wentworth 1994 estates battery?

mark t

Rookie
having driven about 60 miles to bring car home i then left car on drive overnight and it was flat as a pancake..I used a power pack to start it and left it running for 15 minutes on tick over before leaving it for about 24 hours before trying to start and it was flat again...went to kwik fit today who done a test on battery which was fine....i do think car has been off road for a while so whether this mean anything not sure!...any ideas what this could be or is it just that it needs running daily?
 
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