If you exceed 35A (say, a dead short or a mod malfunction pushing 50A), the internal separator melts. This causes an internal short circuit. That heat, combined with the NCA chemistry, leads to "venting with flame."
The "hot" designation in your query likely refers to the cell's thermal behavior under load. -20∘Cnegative 20 raised to the composed with power C +60∘Cpositive 60 raised to the composed with power C
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The Panasonic NCR21700T is a high-performance lithium-ion cell designed for applications requiring high energy density and continuous discharge currents. This article analyzes the technical specifications, performance metrics, and safety guidelines found in the official datasheet. 1. Key Specifications and Technical Dimensions panasonic ncr21700t datasheet hot
The capacity remains high, close to 4800-4900mAh, with minimal voltage sag.
The official operational window for discharging is .
The chemistry is stable, but high temperatures increase internal impedance, causing higher voltage sag, as shown in detailed thermal characterization reports (e.g., Batemo Cell Model ). If you exceed 35A (say, a dead short
If you already own these cells and want to push them safely, follow these thermal management rules derived from the datasheet:
Capable of handling brief pulses up to 30A, provided the external surface temperature is strictly monitored and does not exceed the maximum limits specified in the datasheet. 3. Thermal Limits and Heat Generation ("Hot" Conditions)
: Approximately 21.1mm (Diameter) x 70.4mm (Length) Weight : ~65g – 70g Performance & Thermal Behavior -20∘Cnegative 20 raised to the composed with power
Generally around 2.5V to 3.0V depending on the specific application safety settings. Thermal & Operational Limits
When discharging at continuous loads approaching 15A to 20A or higher, the internal resistance (IR) of the cell generates significant heat.
A quick scan of the primary electrical metrics from the outlines why this particular cell remains heavily sought after for demanding engineering environments: NCR21700 data sheet