Why are lithium batteries not allowed on airplanes?

Related questions

1. Do Single A batteries exist?
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3. What the difference between 2032 and 2025 batteries?
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5. Are lithium batteries dangerous?
6. Do lithium ion batteries explode?
7. Are all AA batteries 1.2 V?
8. What is the strongest battery?
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10. What voltage is a 1.5 volt battery considered dead?

Tags

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20. #limited
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22. #domestic
23. #allowed
24. #though