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Do you know protected 18650 batteries?

Jul. 07, 2017

Protected 18650 Li-ion batteries have a small electronic circuit integrated into the cell packaging. This circuit protects the battery against common dangers, such as overcharge, over discharge, short circuit/over current, and temperature. Protected batteries are safer to use in your devices. Protected batteries are less like to ignite and cause personal or property damage.


18650 Li-ion batteries


Most protected batteries have these components:

PTC: Protect against over heating and indirectly over current. Will automatically reset.

CID or Pressure Valve: Will disable the cell permanently if the pressure is too high in the cell (Can be due to over charge).

PCB: Will protect against over discharge, over charge, and over current, depending on design. The PCB will reset automatically or when placed in a charger.

The following images show you examples of the components of a safe, well-designed protected 18650 battery.