Originally Posted by Diseasel300

Totally unnecessary on a car. You're taking something that's extremely reliable and adding several failure points, including a DC muffin fan (which are hideously reliable long-term).

If your battery is in the engine bay, move it to the trunk or under the rear seat if you want battery longevity. Under the hood, you can expect 4-5 years in a Texas climate maximum. Doesn't matter what kind of battery you run, the thermal cycling kills them. They'll generally die peak of summer or beginning of winter. Batteries located inside the car are exposed to a more stable temperature pattern (and lack the extreme heat of the engine bay) and typically last 5-10 years.