Hello Carly, congrats and welcome aboard. As for the battery related issues, perhaps the following post taken from a past thread, may answer some of your concerns.
You'll also notice an attachment for the latest TSB, in which you'll hopefully find as useful as well.
The batteries are not the problem ! it's the microprocessors/computer modules, also known as parasitic draw which are responsible for draining them. According to the latest TSB..a fully charged battery can last up to 30 days or longer.. However if the vehicle has only been driven for short distances, running only at idle while in storage, and or sitting for more than 7-10 day periods. This will not be enough to prevent batteries from becoming deeply discharged, thus shortening battery life. Where as the alternator requires 1500 RPMs, and up to 2 hours of driving, in order to fully restore a deeply discharged battery.
That being said, the only solution for those who neither run their vehicles very often, due from lack of use, and aren't driven long enough. Are recommended to run battery tender/chargers, in order to maintain fully charged batteries..