How many hours will a 200 amp hour battery last at 168 watt?

How many hours will a 200 amp hour battery last at 168 watt?
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Answer :

If it is a car battery (as given in the category) it is reasonably safe to assume that under load it is about 12V. I = P/E = 168W / 12V = 14A T = 200AH / 14A = 14.29H However it would be entirely different for a different battery. This is also assuming that the car battery is not being charged at any time while the load is present.
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