A Hyundai Sonata hybrid’s battery location is in the trunk, underneath the floor panel. In order to access it, you must first remove the floor mat and look for the small black loop attached to the floor panel. If you pull up on this loop and secure it to the mouth of the trunk, you’ll have no trouble getting a good look at your battery.
Jumpstarting your Sonata hybrid is even easier! On the steering wheel, look for the 12-volt battery jumper button. Just give it a press and your car will jump itself.