Electrical problem
2001 BMW X5 All Wheel Drive Automatic 125000 miles
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couple days ago was too cold here in Edmontonit was -44 with the wind, I tryed to start the car , but it didn't after couple tries i left it till the after noon , then I tryed again , the suv start so i left it running for 15 minutes , then i went back to shut it off but i didn't deciding to warm up more , 5 minutes later i came back the car was off by it self. I tryed to start it over but it didn't . than i noticed after many tries the battery is gone dead. I went to the dealership and i purchased a brand new battery, I installed it and was happy that all lights and dash all back then, I tryed to start it, surprisinglly it didn't , but the difference this time it only clicked once with dimming the light everytime i try . may you please tell me what the possible problem is so i can take it to repair shop knowing what it probablly the problem is .
Tahnks for the help. Tony

at -44 the battery is suspect. how old is the battery?