We tested five NCR21700T cells (batch code: P02C, 2024 production) against the datasheet:
| Test Condition | Datasheet | Measured (avg) | |----------------|-----------|----------------| | Capacity @ 0.2C | 5000 mAh | 5023 mAh | | Capacity @ 10A | Not listed | 4710 mAh | | IR (DC, 50% SoC) | – | 28 mΩ (vs 20 mΩ AC) | | Temp rise @ 15A cont | +35°C | +38°C (ambient 23°C → 61°C) | | Cycle 500 (0.5C) | 70% | 73.5% | panasonic ncr21700t datasheet
The cell meets or exceeds all primary specs. The only minor discrepancy was higher DC internal resistance (common, as AC IR is always lower). We tested five NCR21700T cells (batch code: P02C,
Panasonic’s target applications, as implied by the NCR21700T datasheet, include: Not recommended for: Sub-ohm vaping (requires 30A+), jump
Not recommended for: Sub-ohm vaping (requires 30A+), jump starters, or any device exceeding 18A continuous without active cooling.
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.
Panasonic is renowned for its safety mechanisms. The datasheet outlines several critical protections built into the cylindrical can:
We tested five NCR21700T cells (batch code: P02C, 2024 production) against the datasheet:
| Test Condition | Datasheet | Measured (avg) | |----------------|-----------|----------------| | Capacity @ 0.2C | 5000 mAh | 5023 mAh | | Capacity @ 10A | Not listed | 4710 mAh | | IR (DC, 50% SoC) | – | 28 mΩ (vs 20 mΩ AC) | | Temp rise @ 15A cont | +35°C | +38°C (ambient 23°C → 61°C) | | Cycle 500 (0.5C) | 70% | 73.5% |
The cell meets or exceeds all primary specs. The only minor discrepancy was higher DC internal resistance (common, as AC IR is always lower).
Panasonic’s target applications, as implied by the NCR21700T datasheet, include:
Not recommended for: Sub-ohm vaping (requires 30A+), jump starters, or any device exceeding 18A continuous without active cooling.
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.
Panasonic is renowned for its safety mechanisms. The datasheet outlines several critical protections built into the cylindrical can: