A mandatory hardware or software BMS must monitor individual cell voltages to prevent overcharging (>4.25V) and over-discharging (
When designing battery packs using the NCR21700T, engineers must integrate robust protection mechanisms:
Searching for “Panasonic NCR21700T datasheet max current” yields conflicting numbers. Some early datasheets specify (with 15A allowed with active cooling or reduced cycle life). Later revisions explicitly state 15A continuous provided the cell temperature stays below 80°C. Panasonic’s thermal cutoff is conservative – our testing shows the cell can run at 20A, but cycle life plummets to <300 cycles.
With a high capacity of , the Panasonic NCR21700T significantly outperforms older cells like the NCR18650B (3350mAh) , offering up to 49% more energy per cell . It has an internal resistance of just 11-15mΩ , enabling highly efficient power delivery with minimal energy loss as heat. The NCR21700T also has a low self-discharge rate , retaining most of its charge even after long periods of storage. panasonic ncr21700t datasheet
Approximately 21.35mm (diameter) by 70.3mm (height) . Weight: Maximum 65.0g .
To help tailor this breakdown to your project, could you tell me a bit more about how you plan to use this cell? If you want, tell me: What is your ? What is the peak current draw of your application?
While rated for a maximum continuous discharge of 15A, thermal management is required at high currents. At a 15A draw, internal resistance causes Joule heating. Engineers must ensure the cell temperature does not exceed 60°C during continuous operation to prevent accelerated degradation. 3. Cycle Life and Longevity A mandatory hardware or software BMS must monitor
The Panasonic NCR21700T is a high-capacity 21700-format lithium‑ion cylindrical cell marketed for high‑energy applications that require long run time and reasonable discharge capability. With a nominal voltage around 3.6–3.7 V and a published nominal capacity near 5,000 mAh, the cell represents a class of large-format cylindrical Ni‑rich/NC‑based (NCR-series) chemistries optimized for energy density rather than maximum continuous current. This treatise surveys its specification envelope, internal design and materials implications, electrical and thermal behavior, typical applications, performance tradeoffs, lifecycle and safety considerations, testing and modeling resources, supply/market context, and practical guidance for designers and end users.
No. It is an unprotected flat-top cell. You must add a protection circuit or use a BMS.
| Specification | Typical Values | | --- | --- | | | 4800mAh / 5000mAh | | Standard Charge | 2A (CC-CV) | | Standard Charging Time | ~6 hours | | Rated Charge | 2A | | Rated Charging Time | ~3.6 hours | | Max Continuous Discharge | 10A (Standard), 2C (6.8A Rated) | | Pulse Discharge (Max) | 12A (5-6 seconds) | | Internal Resistance | 12-14mΩ (Source), ≤14mΩ (Typ) | | Nominal Voltage | 3.6V / 3.7V | | Full Charge Voltage | 4.2V ± 0.05V | | Discharge Cut-off Voltage | 2.5V | | Cycle Life | >500 cycles to >3.84Ah | | Weight | 68g ± 0.5g | Panasonic’s thermal cutoff is conservative – our testing
The cell features a (flat‑top), which makes it compatible with most device holders and battery compartments designed for 21700 cells. Note that flat‑top cells may not make contact in some devices designed specifically for button‑top cells; users should verify compatibility before use.
We tested five NCR21700T cells (batch code: P02C, 2024 production) against the datasheet:
| Parameter | Value | |-----------|--------| | Standard Charge Current | 1.5 A (0.3 C) | | Max. Charge Current | 4 A (0.8 C) | | Charge Cut-off Voltage | 4.20 V ±0.03 V | | Standard Discharge Current | 2.5 A | | Max. Continuous Discharge Current | 15 A (or up to 20 A pulsed, check latest specs) | | Discharge Cut-off Voltage | 2.5 V | | AC Impedance (1 kHz) | ≤ 30 mΩ |