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Tester101
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'Cooking' 9V What could cause the battery in a smoke detector to heat up?

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Windy
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'Cooking' 9V battery

One of my smoke detectors was chirping and when I removed the 9V battery, I found it was hot. In fact, it was making a 'cooking' sound.

Was it the smoke detector causing the battery to cook itself or was it a defective battery?