2006 Hyundai Sonata Dead batter, charged battery, lights wo

Contrary to the popular belief that alternator "charges" battery, it only maintains the charge that the battery already has. Running the vehicle at 2000 rpms for 15 minutes won't do it.

You have two options:
1. Remove the battery and take it to your local parts store. Most store can charge it for about 1 hour, and they usually will do it for free.

2. Use an external, actual battery charger, follow the instruction. Usually home charger will fully charge a battery between 4 - 8 hours. Battery removed from vehicle of course.

I prefer option number 1. Once the battery is charged, they can perform a load test on the battery. Usually, you get about 3 years of life from a factory battery.