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My view is that it makes sense to use a heat shield to protect the battery from direct heat from exhaust/turbo. Trying to keep it cooler than the ‘general ambient temp under the bonnet is not really practical unless battery can be positioned to be in the direct path of incoming airflow. With a heat shield you should ensure an air gap remains right around the battery. From time to time the notion of trying to insulate the battery is raised. I’d suggest that doing so will have a negative effect. The battery will just take a bit longer to warm up (from external sources), but once warm will take a lot longer to cool down again.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)