Low internal resistance is vital for two reasons. First, it minimizes heat generation during charging and discharging. Second, it prevents the voltage from sagging significantly when a load is applied. While the NCR21700T is not a "high drain" cell designed for 30A currents, its low impedance ensures efficient energy transfer for its intended load range.
The Panasonic NCR21700T is suitable for a wide range of applications, including:
No. Do not hold at 4.20V indefinitely. The datasheet explicitly warns against trickle charging. panasonic ncr21700t datasheet
The is a high-performance lithium-ion battery cell primarily recognized for its application in high-drain devices and electric vehicle technology, most notably within Tesla Model 3 battery packs. It utilizes a 21700 form factor, which is slightly larger than the traditional 18650 cell, allowing for higher energy density and improved thermal management. Core Specifications
| Parameter | Value | | :--- | :--- | | | 3.6 V (3.7 V common rating) | | Typical Capacity | 4500 mAh - 4700 mAh (Varies by version) | | Minimum Capacity | 4450 mAh | | Maximum Discharge Current | 15A (Continuous) / 25A (Pulse/Peak) | | Standard Charge Current | 2.175 A (0.5C) | | Fast Charge Current | 4.35 A (1C) | | Max Charge Voltage | 4.20 V ± 0.03 V | | Cut-off Voltage | 2.5 V | | Internal Resistance | ≤ 25 mΩ (AC IR at 1kHz) | | Weight | Approx. 69 g | | Operating Temperature | Charge: 0°C to 45°C / Discharge: -20°C to 60°C | | Form Factor | 21700 (Diameter: 21.0 mm +/- 0.2 mm / Height: 70.1 mm +/- 0.3 mm) | | Positive Terminal | Flat Top (Unprotected) | Low internal resistance is vital for two reasons
The 21700 form factor measures 21mm in diameter and 70mm in length. This size offers a 48% volume increase over traditional 18650 cells, allowing for superior thermal management and energy capacity. Specification Value Technical Notes 4,800 mAh (Typical) Rated at 0.2C discharge, 25°C Minimum Capacity Guaranteed minimum factory threshold Nominal Voltage Standard mid-point operating voltage Charging Voltage 4.20V ± 0.03V Maximum safe upper limit voltage Cut-off Voltage Absolute lower discharge limit Standard Charge Current 1,410 mA (0.3C) Optimized for maximum cycle life Max Continuous Discharge 15A (Without temperature cut-off) Safe continuous draw without active cooling Max Pulse Discharge Requires thermal monitoring below 60°C Cell Weight High gravimetric energy density 📈 Performance Dynamics & Discharge Characteristics Voltage Discharge Profile
Ideal for e-bikes, e-scooters, and electric skateboards requiring extended range and rapid hill-climbing current draws. While the NCR21700T is not a "high drain"
For a 4P4S pack (16 cells) delivering 60A total, include a 5mm air gap between cells and a temperature probe attached to the center cell.