Caroline Sheppard

I have a 2010 Subaru Forester that often gets left for a few weeks without use. i lock it with the key manually as mentioned in my handbook, when I come back to it the battery is flat, this has happened now three times this year. I had the battery replaced in February. The most recent time it happened I had been doing mostly local driving of two miles here and there, with four journeys of eight miles there and back over a period of two weeks. I then left it for two weeks and came back to a flat battery again ??? There is nothing left on to drain the battery except the alarm system. Can this be normal or is there something wrong ?? Would diagnostics at a garage be able to tell ?? kind Regards Caroline