Dennis's comments not withstanding, I find it extremely unusual for the battery to drain the point where it does not crank well after just 10 days. Particularly on a new car and new battery (my assumptions here ... please correct me on that - how old is the car and battery?).Assuming that there is nothing wrong with some car component that is draining the battery (have the dealer check it out for current draw when turned off!), then it is most likely that some light was left on during that time, or the door was ajar, or something like that anyway.
Something similar happened to me a while back ... I was on a business trip and left my car at the airport parking lot for about 4 days. When I came back, the battery was stone cold dead and needed a jump start from the parking lot folks (free jumps at San Jose Airport Parking ... one saving grace for the high cost of parking there).
After I got the jump, I discovered that my son had left both the rear reading lamps on when I dropped him to school that morning, before I went to the airport. Since I parked outside (in broad daylight), I did not catch the lights being left on - I probably should have, in retrospect, but I was rushing to catch my flight! 
Sure enough, this was enough to drain the battery ...
Z
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