What could cause the battery in a smoke detector to heat up


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?

Best Answer

Wow- A smoke detector that could cause a fire..

It is very difficult to say

  • It could be a fault in the fire alarm- short circuit that caused the battery to heat up to a cooking point.

  • It could be a chemical fault in the battery where atmospheric pressure and chemical imbalances caused by some impurity during production caused the battery to heat up at a certain point of its life.

Either way

The safest option is to replace both and remove all doubt!

eg ever hear about the exploding iPods... :)