Hot - Panasonic Ncr21700t Datasheet

The datasheet incorporates a PTC (Positive Temperature Coefficient) device and a CID (Current Interrupt Device). Under abusive "hot" conditions (e.g., short circuit at 80°C ambient), the PTC activates at approximately 90°C, limiting current to <5A. However, for legitimate high-drain use, the datasheet strongly recommends active cooling: airflow of 2 m/s reduces surface temperature by 40% at 15A. Without such cooling, cycle life drops from 500 cycles (to 80% capacity) at 25°C to just 250 cycles at 45°C.

The Panasonic NCR21700T is an excellent cell if you respect its thermal limitations. It offers superior capacity (4800mAh) compared to high-power competition. However, the moment you type "Panasonic NCR21700T datasheet hot" into Google, you have likely already exceeded its safe thermal envelope. panasonic ncr21700t datasheet hot

Buy this cell if:

Avoid this cell if:

Internal testing (and independent bench tests by Mooch, a famous battery tester in the vaping community) reveals the following thermal behavior: Avoid this cell if: Internal testing (and independent

The Verdict: The NCR21700T runs hotter than the Samsung 40T under identical loads. Why? Higher internal resistance. While the datasheet claims <18mΩ, real-world DC internal resistance (DCIR) often measures 20-24mΩ at room temperature. As the cell heats up, resistance climbs, creating a vicious heat loop. The Verdict: The NCR21700T runs hotter than the