Panasonic Ncr21700t Datasheet Hot !new! Jun 2026

: 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.

Rule of Thumb: If the cell is too hot to hold comfortably in your hand (approx 50°C+), you are discharging it too fast for its design. panasonic ncr21700t datasheet hot

So why is it running hot?