A good solid battery tray is essential for keeping your battery secure under the hood. A battery's shear weight can make it a dangerous projectile if it's not firmly held down, let alone a loose battery is a potential fire hazard. Especially if you're going to be doing any sort of off-road driving, double check the condition of your batter tray and hold down, and replace them if they are not up to the job of keeping your Jeep's battery in place.
You can also swap out your single battery tray for an aftermarket one that offers the capability to carry dual batteries for extended electrical demands. You could even add a second battery tray in another location to power accessories without the fear of killing your main battery.