Agreed it should last 2 weeks, the run to the airport should fully charge it. The biggest problem is if your alarm is sensitive to aircraft noise and its being activated every time an aeroplane takes off. My 260 sat at Bristol airport for 10 days in January at it started instantly.
If you put a set of jump leads in the car and you do have a problem you should be able to find some one who you can jump from.
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