Panasonic Ncr21700t Datasheet Hot Repack -

Panasonic NCR21700T

The is a high-performance lithium-ion cell widely regarded as a premium choice for high-drain applications such as electric vehicles, power tools, and robotics. Utilizing a Nickel-Cobalt-Aluminum Oxide (NCA) cathode chemistry, this cell is engineered for high energy density and thermal stability. Core Technical Specifications

78°C

The primary driver of thermal behavior is the cell's internal resistance (DCIR). Panasonic's datasheet lists typical DCIR at 1 kHz as ≤ 20 mΩ, but under DC load at 15A, effective resistance rises to ~25 mΩ due to polarization. Joule heating (P = I²R) at 15A yields approximately 5.6W of internal heat. This heat must be conducted through the jellyroll to the can wall. The datasheet’s thermal derating curve shows that at 20A continuous, surface temperature hits after 10 minutes in still air—exceeding the recommended 60°C operating window for longevity.

Cycle Life

: Rated for over 1000 cycles , making it a durable choice for long-term projects. panasonic ncr21700t datasheet hot

The Panasonic NCR21700T is suitable for various applications:

The "hot" performance of the NCR21700T is heavily dependent on temperature management. Operating outside these ranges can lead to thermal runaway or permanent capacity degradation. Panasonic's datasheet lists typical DCIR at 1 kHz

2. Capacity vs. Heat (The Killer Graph)

The datasheet includes a temperature vs. discharge curve. At room temperature (25°C), you get 4,000 mAh. At 0°C, you lose about 20% capacity. But at 60°C+ (where you operate at 35A), cycle life drops by nearly 50%. Running this cell at its "hot" max rating means you are sacrificing lifespan for performance.

Operating outside these temperature ranges can lead to "hot" running conditions, reducing the cell's lifespan or triggering safety risks. The datasheet’s thermal derating curve shows that at

In this article, we dissect the official Panasonic NCR21700T datasheet, translate the electrical jargon, and explain exactly why this cell runs hot, where the thermal limits are, and how to use it safely without venting your device.