Quote:
Originally Posted by Ultramaroon
One day months ago I removed the accessory belt to prove to myself the car would start and run on battery only.
I know enough about the power requirements of this car, and have enough experience limping home with failed alternators on previous cars, to state with confidence that without an accessory belt, this thing will run on battery waaaaaaaaaaaaay longer than it will take to overheat.
I'm happy to discuss the topic in earnest? 
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Well, after doing some research on several batteries, it appears the average RC (Reserve Capacity) is about 60 minutes.
So, even if the FR-S battery was half that, the engine would overheat, due to the water pump not running, before the battery would run out of juice.
So, there ........ @
Tcoat was WRONG !.........
humfrz