Why does 05 Nissan Pathfinder stall using AC on high when car is idling

Hello, when the vehicle stalls and will not start back up, is it that the engine will not crank at all? Or is it more that the engine cranks but will not start? If it's cranking but not starting, the battery replacement doesn't figure in at all. If it's not cranking, it'd be a question as to why that's happening. A battery may cure a symptom initially but if the problem is not solved, it will not be a sustainable cure. www.repairpal.com/repair-shops