Car won't start out in brand new battery

Hello, You have a few things to check: -warranty status: if you are under warranty, make them deal with it. Even if you bought it used, call a Hyundai service center with your VIN to double check warranty status. -Corrosion on the battery terminals -Ground cable has a tight and clean connection to the chassis -Power at the starter motor is the same as power at the battery (can be up to 0.5 volts lower, but any more is a problem) -battery voltage - I've pulled more than a few new batteries off the shelf that needed a little charging - starter motor may be failing (have tested at an auto parts store for free most times) See what you find, and let me know if you have more questions