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There is a source that states: 18650 batteries sold in the US are required to have CID and PTC protection.

I've read that CID is just an insulation layer, and PTC is a resettable fuse which deactivates the battery at high temperatures.

Does it reduce the probability of an explosion by 90% or by 99.999% from excess currents and short circuits? Has CID and PTC protection been measured and certified for effectiveness?

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  • \$\begingroup\$ Unless someone here has been personally involved in these testing programs for these devices with this type of battery, it would take extensive research, and much of the results of this research can be classified at a company level. They will only release data that is in favor of tested parts that worked good, and a general failure rate or MTBF. Keep checking for comments and answers. \$\endgroup\$ – Sparky256 Oct 13 '18 at 5:24

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