I wouldn't wait a few days, I'd get this checked at the parts store as soon as they open. And with that, take it with a grain of salt they aren't master technicians. One thing to consider, Batteries Plus, they have a comprehensive tester, and they are likely better trained at battery/alternator testing then the guys at the auto-parts store.
unfortunately I have school and work 6am - 11pm until wednesday, but the first chance I have I will for sure be over testing it out. Itís been getting worse over the past few days. Yesterday when I turned my car off I lost all electronics immediately, headlights turned off, radio quit, nothing. they came back on but was still a shock. (didnít even have powered seat)