What type of battery do I need to buy for my suv

They have charts at the auto parts stores that will specify the battery for your vehicle. You need to look at the physical size, how it is held in place, which side the positive terminal is on, and the cold cranking amp rating. It's almost impossible to buy a new battery with a cold cranking amp rating that is too low. More is better but there's no sense paying more to get something you don't need.

Be very careful you don't mix up the terminals when you connect the cables to the new battery. If you do and you're real lucky, you'll just have lots of blown fuses. If you're like most people, you'll be buying a lot of computers.