My Armada too have the same issue. I was told by my trustee battery seller guy that some people do change location of the battery to under the seat of the front passenger. And that has increased the life of the battery because of cooler temperature than the engine bay.
I use Amaron batteries and they have been serving me well. But the only thing to be concern is till its death it gives a healthy start up so you won't notice that the battery is about to fail. A regular battery health check can prevent that. Take care.