I left a Duracell plus 9v battery in my jacket. The next day I went outside to shut my gate when I put my hand in the jacket pocket the battery was very warm. I placed it on the kitchen table an it took several minutes to cool down. The jacket had not been hanging near any heat source.
Why would this happen?
Nothing else was in the pocket and I had not worn the jacket for over 24 hours !
If you had been wearing your jacket. Your body temperature is 37 deg C (98.6 deg F). The jacket material prevents heat loss and helps to build up the heat in your pocket. As the 9V battery usually has a metal casing (a good heat conductor), it will assume its warm environmental temperature.
You can check the outside temperate. If it is 20 deg C (68 deg F), there is a relative temperature (17 deg C) difference that can be felt easily. This will take a while to cool down.
Check if your battery is flat or still at a good working level. That will give you a clue.
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