# My 18650 batteries vented when I put them in the PicoCalc

**URL:** <https://forum.clockworkpi.com/t/my-18650-batteries-vented-when-i-put-them-in-the-picocalc/19975>\
**Category:** PicoCalc\
**Created:** [October 6, 2025, 3:51am UTC](https://forum.clockworkpi.com/t/my-18650-batteries-vented-when-i-put-them-in-the-picocalc/19975 "2025-10-06T03:51:20Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![pelrun](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/pelrun/32/12323_2.png) [@pelrun](https://forum.clockworkpi.com/u/pelrun)\
**Post date:** [October 6, 2025, 6:59am UTC](https://forum.clockworkpi.com/t/my-18650-batteries-vented-when-i-put-them-in-the-picocalc/19975/11 "2025-10-06T06:59:03Z")

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18650s aren’t simply “better AAs”. You need to treat them with respect, and don’t just assume that everything will be ok if you do something dumb. _Any_ time you have a loose cell you have to think through everything you’re doing before you do it, then stop and check again.

And “protected” cells aren’t magically safe either - they can potentially prevent certain classes of failure, but they’re not idiot proof, and they can make you complacent.

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