If you are asking about the "hot" data because your batteries are getting hot during use:
: 21700 (21mm x 70mm), which offers higher energy density than traditional 18650 cells. Промелектроніка
Comprehensive Breakdown of the Panasonic NCR21700T Li-ion Battery Datasheet panasonic ncr21700t datasheet hot
On the surface, the NCR21700T is a direct competitor to the Samsung 40T and the Molicel P42A. However, unlike its rivals, the Panasonic cell uses a modified NCA (Nickel-Cobalt-Aluminum) chemistry that trades ultra-low resistance for higher energy density.
At first glance, 15A continuous and 5000 mAh is excellent. But here is the catch: The datasheet says maximum 15A, but it does not say "15A without significant temperature rise." In fact, the thermal appendix of the datasheet (which most people skip) warns that operating near 15A for extended periods will push the cell surface temperature past 65°C—the official cutoff for safety. If you are asking about the "hot" data
The primary driver of thermal behavior is the cell's internal resistance (DCIR). Panasonic's datasheet lists typical DCIR at 1 kHz as ≤ 20 mΩ, but under DC load at 15A, effective resistance rises to ~25 mΩ due to polarization. Joule heating (P = I²R) at 15A yields approximately 5.6W of internal heat. This heat must be conducted through the jellyroll to the can wall. The datasheet’s thermal derating curve shows that at 20A continuous, surface temperature hits after 10 minutes in still air—exceeding the recommended 60°C operating window for longevity.
Thanks to its high capacity and low internal resistance, the Panasonic NCR21700T is widely used across many industries: At first glance, 15A continuous and 5000 mAh is excellent
Due to its high energy density and robust discharge profile, the Panasonic NCR21700T is frequently selected for: Electric vehicles (EVs) and E-bikes Cordless power tools Energy Storage Systems (ESS) High-end portable flashlights and vaping hardware Industrial automation and robotics
The official operational window for discharging is .