Panasonic Ncr21700t Datasheet Jun 2026

Only use a dedicated Li-ion charger with CC/CV (Constant Current/Constant Voltage) protocol.

| 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 longest life, stay ≤10A. For occasional 15A bursts (e.g., power tools), the cell performs admirably. panasonic ncr21700t datasheet

| Parameter | Value | Reviewers' Take | |-----------|-------|------------------| | | 4800 mAh (0.2C discharge) | Excellent for 21700 format. Slightly above the common 4500-5000 mAh range. | | Nominal Voltage | 3.6V (3.7V typical) | Standard Li-ion. | | Max Discharge Current | 2C (9.6A continuous) / 4C (19.2A pulse) | Major limitation. This is a low-drain cell. | | Standard Charge | 1.4A (0.3C) | Very slow by modern 21700 standards. | | Fast Charge | 3.2A (0.67C) | Still slow. Compare to Samsung 50G or LG M50LT (1C+). | | Max Charge Voltage | 4.20V ±0.03V | Standard, not high-voltage (4.35V). | | Cut-off Voltage | 2.5V | Standard. | | Internal Resistance | ≤ 40 mΩ (AC IR) | Good, but not exceptional (high-power cells are ~10 mΩ). | | Weight | ~69g | Very light for capacity – good energy/weight ratio. | | Operating Temp | Charge: 0~45°C / Discharge: -20~60°C | Standard range. |

Optimized for gravimetric density (~263 Wh/kg), providing more runtime for its weight than standard 18650s. Stable Discharge: Only use a dedicated Li-ion charger with CC/CV

As a result, battery builders and system integrators must rely on secondary sources, aggregated data from reputable resellers, and independent laboratory tests to confirm the cell's true capabilities.

-20°C to 60°C (Low-temperature discharge reduces effective capacity due to increased internal resistance; high-temperature discharge accelerates chemical aging). | Parameter | Value | Reviewers' Take |

The lithium-ion battery market has been dominated by the shift from the standard 18650 form factor to the larger, more energy-dense 21700 format. Leading this charge is Panasonic, a Tier-1 supplier whose cells power everything from electric vehicles (EVs) like Tesla to high-end consumer electronics.

Never use a cell with a torn, punctured, or peeling outer PVC sleeve. A exposed metal casing acts as a negative terminal; if it touches a positive contact, an immediate short circuit occurs.

The cell offers a volumetric energy density of approximately 775 Wh/l and a gravimetric density of 263 Wh/kg , making it highly efficient for its weight and size.