AR One battery issues

[Erhoda19]

Just bought an AR One Maxx 19bh and took it to the Adirondacks for a week. By our second night we noticed our battery was already down to 1/3. We hadn't used anything that requires power except interior lights for a few minutes at night to put the kid to bed, and to put out the awning when we set up. With no generator or solar panel we were forced to connect to the truck a few times throughout the week just to get the battery through. After a 2 1/2 hour drive home the battery is still not fully charged. Could it just be a bad battery? Could it be some faulty wiring or a short that is causing it to drain? Any help would be appreciated.