# How long can a Li-On battery vent without burning?

**URL:** <https://boards.straightdope.com/t/how-long-can-a-li-on-battery-vent-without-burning/836943>\
**Category:** Factual Questions\
**Created:** [July 12, 2019, 1:36am UTC](https://boards.straightdope.com/t/how-long-can-a-li-on-battery-vent-without-burning/836943 "2019-07-12T01:36:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Velocity](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/velocity/32/18006_2.png) [@Velocity](https://boards.straightdope.com/u/Velocity)\
**Post date:** [July 12, 2019, 1:36am UTC](https://boards.straightdope.com/t/how-long-can-a-li-on-battery-vent-without-burning/836943/1 "2019-07-12T01:36:49Z")

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A technician told me a laptop’s Li-On battery can vent fumes without first bulging or catching fire - which has me confused - doesn’t the Li-On contents, by their very nature, ignite on contact with outside air?