Panasonic Ncr21700t Datasheet Hot -

The Panasonic NCR21700T is a high-performance lithium-ion battery cell originally popularized as a primary component in Tesla Model 3 battery packs. While often difficult to find through official retail channels as a standalone consumer product, it is highly sought after in the DIY EV and flashlight communities for its balance of high capacity and discharge capability. Core Specifications

Based on technical data typically associated with the NCR21700 series, these cells offer robust energy density and thermal stability. Nominal Capacity: ~4,800mAh to 5,000mAh Nominal Voltage: 3.6V Charging Voltage: 4.2V (Full Charge) Standard Discharge Cutoff: 2.5V to 3.0V Weight: Approximately 65.0g Dimensions: ~21.1mm (Diameter) x 70.3mm (Height) Performance Characteristics

The "T" variant is noted for its ability to handle higher current draws compared to standard energy-focused cells.

Discharge Rates: It supports continuous discharge rates typically ranging from 10A to 15A, with some pulse capabilities reaching higher under specific thermal management conditions.

Thermal Window: Standard operating temperatures range from 10°C to +45°C for charging and -20°C to +60°C for discharging.

Energy Density: Features high volumetric energy density (~775 Wh/l), making it ideal for compact, high-capacity battery packs. Community & Usage Notes

Origin: Many NCR21700T cells found on the market are "reclaimed" or salvaged from electric vehicle modules. These may show signs of removed aluminum wire bonds on the terminals.

Availability: Because Panasonic primarily supplies these to OEMs like Tesla, official retail datasheets can be elusive. Many users rely on community-tested models and digital twins from providers like Batemo for precision engineering. panasonic ncr21700t datasheet hot

Flashlight Compatibility: While powerful, users should note that these are usually "flat-top" cells and may require specific adapters or spacers for use in standard consumer flashlights.

against other high-current 21700 cells like the Molicel P45B or Samsung 50S? Panasonic NCR2170-M Battery Data, Model and Report

The Panasonic NCR21700T is a high-performance lithium-ion cell widely regarded as a premium choice for high-drain applications such as electric vehicles, power tools, and robotics. Utilizing a Nickel-Cobalt-Aluminum Oxide (NCA) cathode chemistry, this cell is engineered for high energy density and thermal stability. Core Technical Specifications

The following data highlights the primary performance metrics typical for the NCR21700 series: Nominal Capacity: Approximately 4800mAh to 5000mAh.

Nominal Voltage: 3.6V (consistent across discharge cycles for modern brushless motors).

Maximum Discharge Rate: Capable of sustained high-current delivery, typically rated up to 40A for "hot" high-drain needs. Charge Voltage: Standard 4.20V.

Discharge Cut-off: Generally around 2.5V to 3.0V depending on the specific application safety settings. Thermal & Operational Limits Power Density: At 35A and 3.6V

According to Panasonic technical documentation, maintaining proper temperature is critical for safety and longevity: Operating Temperatures: Charging: 10°C to +45°C. Discharging: -20°C to +60°C.

Heat Management: While the cell is designed for high-drain use, continuous operation at its maximum current (40A) can generate significant internal heat. Many expert guides recommend a more conservative continuous discharge to prevent thermal throttling. Key Advantages Panasonic Lithium Batteries Handbook

The Panasonic NCR21700T is a high-performance 21700 lithium-ion cell frequently cited for its balance of high capacity and substantial discharge capability, though it is often noted as being sourced from electric vehicle battery packs (like the Tesla Model 3) rather than being sold as a standalone retail product by Panasonic. Key Specifications Full Product Name: Panasonic NCR21700T Lithium-Ion Battery Nominal Capacity: 4800mAh to 5000mAh Nominal Voltage: 3.6V – 3.7V Maximum Charge Voltage: 4.2V

Continuous Discharge Current: Varies by source, typically listed at 30A maximum continuous (with peaks up to 40A) in high-drain applications. Some conservative retail listings suggest 10A–15A for optimal longevity. Operating Temperature (Discharge): -20°C to +60°C Operating Temperature (Charge): 0°C to +45°C (Standard)

Dimensions: Approximately 21.1mm (Diameter) x 70.4mm (Length) Weight: ~65g – 70g Performance & Thermal Behavior

Heat Management: During high-rate discharge (e.g., 20A+), internal resistance can cause significant surface temperature increases. For safety, these cells should be monitored to ensure they do not exceed a surface temperature of 60°C during operation.

High Drain Performance: Testers from community forums like Endless Sphere note that these cells maintain stable voltage even under heavy loads, making them popular for DIY EV projects and high-power flashlights. but this generates significant heat.

Cycle Life: Rated for over 1,000 cycles under standard conditions before significant capacity loss. Safety Note

This is an unprotected (flat top) cell. It does not have a built-in protection circuit (PCM/PCB) and must be used with external battery management systems to prevent overcharging, over-discharging, and short circuits.

2. Monitor Terminal Temperature

Buy an infrared thermometer. If the metal can exceeds 55°C (131°F) , stop discharging. The datasheet explicitly states that exceeding 60°C voids the warranty and accelerates aging.

1. Internal Protection (PTC)

Failure 2: Venting (The Sizzle)

The NCR21700T has a CID (Current Interrupt Device) and a PTC (Positive Temperature Coefficient) thermistor. When the internal temperature hits ~85°C, the PTC increases resistance to stop the current. If you bypass safety circuits, the cell will vent electrolyte. That hot smell is gas escaping. If you hear hissing, throw the device outside immediately.

Continuous Discharge Current

1. Thermal Specifications (Absolute Limits)

These are the hard limits defined by Panasonic to prevent thermal runaway or permanent degradation.

The Smoking Gun: The Discharge Rating

Standard 21700 cells (like the Samsung 50E) prioritize capacity, maxing out at 9.8A to 15A. The Panasonic NCR21700T is a different beast.

According to the datasheet, this cell is rated for 35A continuous discharge (and some early revisions even suggested burst rates up to 45A).

Why does this make it "hot"?

  1. Power Density: At 35A and 3.6V, you are pulling roughly 126 Watts continuously from a single cell the size of your thumb.
  2. The Heat Curve: At 35A, the internal resistance generates significant Joule heat (I²R loss). The datasheet shows that at this load, the surface temperature of the cell climbs rapidly past 80°C (176°F) within minutes.

The Thermal and Electrical Dynamics of the Panasonic NCR21700T: A Datasheet Analysis of High-Performance Operation

3. Datasheet Verdict: Is the "Hot" Performance a Deal Breaker?

It depends on your application. Let’s categorize by use case:

The Panasonic NCR21700T is a high-performance lithium-ion battery cell originally popularized as a primary component in Tesla Model 3 battery packs. While often difficult to find through official retail channels as a standalone consumer product, it is highly sought after in the DIY EV and flashlight communities for its balance of high capacity and discharge capability. Core Specifications

Based on technical data typically associated with the NCR21700 series, these cells offer robust energy density and thermal stability. Nominal Capacity: ~4,800mAh to 5,000mAh Nominal Voltage: 3.6V Charging Voltage: 4.2V (Full Charge) Standard Discharge Cutoff: 2.5V to 3.0V Weight: Approximately 65.0g Dimensions: ~21.1mm (Diameter) x 70.3mm (Height) Performance Characteristics

The "T" variant is noted for its ability to handle higher current draws compared to standard energy-focused cells.

Discharge Rates: It supports continuous discharge rates typically ranging from 10A to 15A, with some pulse capabilities reaching higher under specific thermal management conditions.

Thermal Window: Standard operating temperatures range from 10°C to +45°C for charging and -20°C to +60°C for discharging.

Energy Density: Features high volumetric energy density (~775 Wh/l), making it ideal for compact, high-capacity battery packs. Community & Usage Notes

Origin: Many NCR21700T cells found on the market are "reclaimed" or salvaged from electric vehicle modules. These may show signs of removed aluminum wire bonds on the terminals.

Availability: Because Panasonic primarily supplies these to OEMs like Tesla, official retail datasheets can be elusive. Many users rely on community-tested models and digital twins from providers like Batemo for precision engineering.

Flashlight Compatibility: While powerful, users should note that these are usually "flat-top" cells and may require specific adapters or spacers for use in standard consumer flashlights.

against other high-current 21700 cells like the Molicel P45B or Samsung 50S? Panasonic NCR2170-M Battery Data, Model and Report

The Panasonic NCR21700T is a high-performance lithium-ion cell widely regarded as a premium choice for high-drain applications such as electric vehicles, power tools, and robotics. Utilizing a Nickel-Cobalt-Aluminum Oxide (NCA) cathode chemistry, this cell is engineered for high energy density and thermal stability. Core Technical Specifications

The following data highlights the primary performance metrics typical for the NCR21700 series: Nominal Capacity: Approximately 4800mAh to 5000mAh.

Nominal Voltage: 3.6V (consistent across discharge cycles for modern brushless motors).

Maximum Discharge Rate: Capable of sustained high-current delivery, typically rated up to 40A for "hot" high-drain needs. Charge Voltage: Standard 4.20V.

Discharge Cut-off: Generally around 2.5V to 3.0V depending on the specific application safety settings. Thermal & Operational Limits

According to Panasonic technical documentation, maintaining proper temperature is critical for safety and longevity: Operating Temperatures: Charging: 10°C to +45°C. Discharging: -20°C to +60°C.

Heat Management: While the cell is designed for high-drain use, continuous operation at its maximum current (40A) can generate significant internal heat. Many expert guides recommend a more conservative continuous discharge to prevent thermal throttling. Key Advantages Panasonic Lithium Batteries Handbook

The Panasonic NCR21700T is a high-performance 21700 lithium-ion cell frequently cited for its balance of high capacity and substantial discharge capability, though it is often noted as being sourced from electric vehicle battery packs (like the Tesla Model 3) rather than being sold as a standalone retail product by Panasonic. Key Specifications Full Product Name: Panasonic NCR21700T Lithium-Ion Battery Nominal Capacity: 4800mAh to 5000mAh Nominal Voltage: 3.6V – 3.7V Maximum Charge Voltage: 4.2V

Continuous Discharge Current: Varies by source, typically listed at 30A maximum continuous (with peaks up to 40A) in high-drain applications. Some conservative retail listings suggest 10A–15A for optimal longevity. Operating Temperature (Discharge): -20°C to +60°C Operating Temperature (Charge): 0°C to +45°C (Standard)

Dimensions: Approximately 21.1mm (Diameter) x 70.4mm (Length) Weight: ~65g – 70g Performance & Thermal Behavior

Heat Management: During high-rate discharge (e.g., 20A+), internal resistance can cause significant surface temperature increases. For safety, these cells should be monitored to ensure they do not exceed a surface temperature of 60°C during operation.

High Drain Performance: Testers from community forums like Endless Sphere note that these cells maintain stable voltage even under heavy loads, making them popular for DIY EV projects and high-power flashlights.

Cycle Life: Rated for over 1,000 cycles under standard conditions before significant capacity loss. Safety Note

This is an unprotected (flat top) cell. It does not have a built-in protection circuit (PCM/PCB) and must be used with external battery management systems to prevent overcharging, over-discharging, and short circuits.

2. Monitor Terminal Temperature

Buy an infrared thermometer. If the metal can exceeds 55°C (131°F) , stop discharging. The datasheet explicitly states that exceeding 60°C voids the warranty and accelerates aging.

1. Internal Protection (PTC)

Failure 2: Venting (The Sizzle)

The NCR21700T has a CID (Current Interrupt Device) and a PTC (Positive Temperature Coefficient) thermistor. When the internal temperature hits ~85°C, the PTC increases resistance to stop the current. If you bypass safety circuits, the cell will vent electrolyte. That hot smell is gas escaping. If you hear hissing, throw the device outside immediately.

Continuous Discharge Current

1. Thermal Specifications (Absolute Limits)

These are the hard limits defined by Panasonic to prevent thermal runaway or permanent degradation.

The Smoking Gun: The Discharge Rating

Standard 21700 cells (like the Samsung 50E) prioritize capacity, maxing out at 9.8A to 15A. The Panasonic NCR21700T is a different beast.

According to the datasheet, this cell is rated for 35A continuous discharge (and some early revisions even suggested burst rates up to 45A).

Why does this make it "hot"?

  1. Power Density: At 35A and 3.6V, you are pulling roughly 126 Watts continuously from a single cell the size of your thumb.
  2. The Heat Curve: At 35A, the internal resistance generates significant Joule heat (I²R loss). The datasheet shows that at this load, the surface temperature of the cell climbs rapidly past 80°C (176°F) within minutes.

The Thermal and Electrical Dynamics of the Panasonic NCR21700T: A Datasheet Analysis of High-Performance Operation

3. Datasheet Verdict: Is the "Hot" Performance a Deal Breaker?

It depends on your application. Let’s categorize by use case: