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.
The search for a reliable high-capacity, high-drain cylindrical cell frequently leads engineers and battery enthusiasts straight to the Panasonic NCR21700T
Thanks to its high capacity and low internal resistance, the Panasonic NCR21700T is widely used across many industries:
The NCR21700T runs hotter than the Samsung 40T under identical loads. Why? Higher internal resistance. While the datasheet claims <18mΩ, real-world DC internal resistance (DCIR) often measures 20-24mΩ at room temperature. As the cell heats up, resistance climbs, creating a vicious heat loop. panasonic ncr21700t datasheet hot
Capable of higher bursts, though this significantly increases heat. End-of-Discharge Voltage: 2.5V (Standard cut-off) Thermal & Safety Guidelines
This article provides a comprehensive overview of the , analyzing its core specifications, performance under load, and crucial information regarding its operating temperatures, especially when the cell gets "hot" during high-drain applications. 1. Panasonic NCR21700T Technical Specifications
Let’s crack open the official Panasonic NCR21700T datasheet and separate the scorching performance from the literal heat. The NCR21700T has a CID (Current Interrupt Device)
Keep in mind that datasheets can vary depending on the source and specific product revisions. If you're looking for a detailed datasheet, I recommend checking the official Panasonic website or contacting their support team for the most up-to-date information.
The "hot" keyword points to the NCR21700T's ability to run , both in terms of high current and high temperature tolerance.
The following technical details are compiled from reputable retail and testing sources: Specification Typical Capacity Minimum Capacity 4800–4900 mAh Nominal Voltage Max Charge Voltage Discharge Cut-off Max Continuous Discharge 15A to 30A (Depending on source/thermal conditions) Peak Discharge Cycle Life >500 to 1000+ cycles ~66.8g to 70g Thermal & "Hot" Characteristics That hot smell is gas escaping
The required by your application
Charging a hot NCR21700T is deadly. The datasheet warns against charging below 0°C, but it fails to emphasize: If you attempt to charge a cell that is still hot from discharge (say, 50°C), lithium plating occurs. Needles of lithium metal grow inside, piercing the separator. This leads to an internal short circuit hours or days later—resulting in a fire while the device sits idle on a table.
is a high-capacity 21700 lithium-ion cell, frequently favored for industrial and high-drain applications such as power tools and e-bikes due to its 5000mAh capacity and robust discharge capabilities. Nominal Capacity: 4800–5000 mAh Nominal Voltage: 3.6V
The NCR21700T has a high thermal stability, which is essential for safe and reliable operation. Here are some thermal characteristics: