Kevin,
I'm probably jinxing myself by saying this, but oh well.
My battery is older than 4 years and it isn't unusual for my car to sit for 2-3 weeks at a time without being touched. Thus far I haven't had any issues with the battery and I've never used a trickle charger.
If you get a new, fully charged battery it should be fine sitting unattended for a week or two based on my experience. Of course there is a chance that you have an alternator issue or something draining the battery that is causing your problem.
Best of luck and enjoy the new garage.
Derek
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