Panasonic Ncr21700t Datasheet [new]
The "21700" designation dictates the form factor of the cell. The precise dimensions from the technical drawing are critical to map out physical clearances and busbar arrangements when engineering a physical battery enclosure. Standard Value Maximum Tolerance Height ( ) Weight Electrical Characterization and Discharge Curves The Charging Profile (CC-CV Method)
The 5,000 mAh rating is industry-leading for 21700 cells available to the public. At 0.2C (1,000 mA) discharge to 2.5V at 25°C, a fresh cell will deliver at least 5,000 mAh. However, at higher drain (e.g., 10A), expect capacity to drop to ~4,600–4,700 mAh due to internal resistance losses. The datasheet’s “minimum capacity” of 4,900 mAh ensures consistency across production batches.
In this article, we will extract, explain, and expand upon every critical specification from the official Panasonic NCR21700T datasheet. We will also discuss real-world performance, safety precautions, and common applications.
The cell is designed for a lower continuous discharge rate, optimized for high-capacity applications. While some sources suggest up to 10A-30A depending on thermal management, typical high-capacity applications utilize this cell at lower continuous currents to maximize run-time. panasonic ncr21700t datasheet
| Feature | | NCR18650B (Legacy) | NCR21700A (Previous Gen) | | :--- | :--- | :--- | :--- | | Form Factor | 21700 | 18650 | 21700 | | Capacity | 4800 mAh | 3400 mAh | ~4000 - 4500 mAh | | Energy | ~17.3 Wh | ~12.2 Wh | ~15.8 Wh | | Advantage | Highest energy density in class | Mature technology | Good balance of power/energy |
For mechanical design, the datasheet provides exact dimensions:
Limiting the charge voltage to 4.1V and avoiding deep discharges (above 3.0V) can double the total cycle life. Critical Safety and Temperature Thresholds The "21700" designation dictates the form factor of the cell
Disclaimer: This report is based on technical specifications available for the Panasonic NCR21700T series. Always consult the official manufacturer datasheet for the specific lot code before final design, as specifications can be subject to change.
The cell offers a volumetric energy density of approximately 775 Wh/l , making it one of the most efficient 21700 cells for space-constrained designs.
Panasonic NCR21700T Datasheet: Specifications, Performance, and Applications In this article, we will extract, explain, and
– Good for specific use, poor for general high-drain applications.
German battery forum discussions note that while the cell can theoretically handle 30 A discharge currents, the usable energy drops significantly when discharged at higher rates, particularly if the cut‑off voltage is set above 3.0 V. In other words, the cell is high‑capacity but not truly high‑power; pushing it beyond its rated continuous current will result in diminished performance and potentially reduced service life.
(Note: Designers must account for the natural swelling of the cell—up to 10-15% expansion in diameter—over its lifetime when designing battery packs.)