My mom bought a Hyundai Sonata Sport 2017 she bought it August 2017 with only 9000 miles currently on it. She bought it when it had 200 miles on it. We live in Minnesota and we are in the middle of a deep freeze. The car failed to start this morning. She had the car jump started and took it into the dealership. They said that it is normal on new batteries that if you only drive a few miles at a time, then maybe later that day take it out and drive a few miles of in town driving( a few being 3 or 4) then batteries will only last for a couple of years, but if you take the car out to drive on longer drives then you can get the battery to last for 5 or 6 years. Also they suggested that charging the battery every night would extend the life.
Is this true or is the dealer just trying to get rid of my mom and not want to deal with the issue?
Also would charging the battery each night make any difference?