Panasonic Ncr21700t Datasheet Hot -

Panasonic Ncr21700t Datasheet Hot -

Charging a hot NCR21700T is deadly. The datasheet warns against charging below 0°C, but it fails to emphasize: Do not charge above 45°C. 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.

Search engines are seeing the phrase "panasonic ncr21700t datasheet hot" because users are experiencing real-world thermal saturation. Here is the science:

At 20°C ambient, the NCR21700T datasheet specifies a nominal capacity of 4.0 Ah to 4.2 Ah with a nominal voltage of 3.6V. The "hot" classification arises from its maximum continuous discharge rating: 15A to 20A (depending on temperature cutoff settings). Unlike lower-impedance cells (e.g., Molicel P42A), the NCR21700T operates near its thermal limit at 20A. The datasheet explicitly warns that continuous discharge at >15A will elevate the cell surface temperature beyond 60°C, a critical threshold where cycle life degrades exponentially. panasonic ncr21700t datasheet hot

This section covers how the cell behaves under heat and how much heat it generates during use.

First, the basics. The NCR21700T is a cylindrical lithium-ion cell (21mm x 70mm) built on Panasonic’s famous NCA (Nickel-Cobalt-Aluminum) chemistry. Charging a hot NCR21700T is deadly

But here is where the "hot" part comes in: Maximum Continuous Discharge Current.

  • Discharging Temperature: -20°C to 60°C (-4°F to 140°F)

    • Before diving into the thermal data, here are the baseline specifications for the cell. But here is where the "hot" part comes

    If your NCR21700T is hot after use, wait 45 minutes before charging. Place it on a metal tray (not a plastic charger) to dissipate heat. Only charge at 0.5C (2.2A) or less. Rapid charging at 5.8A will turn a warm cell into a hand grenade.