2015 auto VT, 2013 manual VT × 2
Finding a good battery to fit the car should not be an issue. Many sizes can be run. Just get a battery with a good warranty with same or higher CCA than the oem. Car batteries need to be replaced every 5 years anyway. Your plugs need to be changed every 50k miles as well by the way. Go to the oem plug for a 16+ VT or 19+ VN. Having a 13 you may want to read up on good maintenance so it lasts much longer than it may on the current route.