If you are into high-performance flashlights, DIY power walls, or electric vehicles (ironically), you have likely heard of the Panasonic NCR21700T.
While the world went crazy for the 18650, the 21700 form factor is the new king of capacity and power density. And the NCR21700T? It sits right at the top of the throne.
But you shouldn’t buy a cell based on marketing hype. You need to read the datasheet. Let’s strip down the official specs and see what this battery is actually capable of.
The discharge plateau is what matters. The NCR21700T maintains ~3.6V for most of its usable range. At 5A discharge, the voltage stays above 3.4V until about 80% depth of discharge. At 15A continuous, the voltage sags to ~3.2V early, so higher currents will reduce usable energy noticeably. panasonic ncr21700t datasheet
| Parameter | Value |
|-----------|--------|
| Diameter | 21.0 mm ±0.2 mm |
| Height | 70.0 mm ±0.3 mm |
| Weight (approx.) | 68 g |
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. Deep Dive: The Panasonic NCR21700T Datasheet – A
Before diving into complex charts, here are the headline specifications as listed in the Panasonic NCR21700T technical datasheet:
| Parameter | Value | |-----------|-------| | Model | NCR21700T | | Nominal Voltage | 3.6 V (3.7 V typical in some revisions) | | Typical Capacity | 5,000 mAh (0.2C discharge, 25°C) | | Minimum Capacity | 4,900 mAh | | Nominal Energy | 18.0 Wh | | Standard Charge Current | 1.5 A (0.3C) | | Max Continuous Discharge Current | 15 A (Note: some datasheets list 12.5A at 80°C cutoff) | | Max Discharge (Pulse) | 30 A (< 5 seconds) | | Internal Impedance (AC, 1kHz) | ≤ 30 mΩ (typical ~20 mΩ) | | Charge Voltage (CC/CV) | 4.20 V ± 0.03 V | | Cut-off Discharge Voltage | 2.50 V | | Cycle Life | ≥ 500 cycles (to 70% of initial capacity at 0.5C/0.5C) | | Weight | 69 g (max) | | Operating Temperature (Discharge) | -20°C to +60°C | | Operating Temperature (Charge) | 0°C to +45°C |
These numbers confirm the NCR21700T as a high-capacity, medium-drain cell. It is not a “high current” cell like the Samsung 40T (35A), but it excels in applications requiring long runtime with moderate power bursts. Not recommended for: Sub-ohm vaping (requires 30A+), jump
For exact ratings (pulse current, internal resistance, detailed charge/discharge curves, temperature ranges, mechanical tolerances, and safety test results), download the official Panasonic NCR21700T datasheet from Panasonic’s technical documentation or authorized distributors.
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(Note: Related search terms prepared.)
Based on the official specifications for the Panasonic NCR21700T (typically referred to as the NCR21700T), I have developed a comprehensive technical report. This report is designed to be useful for battery engineers, product designers, and procurement specialists.