Panasonic Ncr21700t Datasheet Hot (LIMITED 2027)

The Panasonic NCR21700T

2. Pressure Vent

  • If the cell overheats drastically (thermal runaway), an internal safety valve will rupture (vent) to release gas and prevent an explosion.
  • Warning: A venting cell releases hot, toxic gas. If you hear a hissing sound or smell chemicals, move away immediately.

Stay cool, and discharge safely.

All three groups notice the same thing: When you push this cell past 25A continuous, the temperature skyrockets. Here is what the datasheet implies but rarely states explicitly: The 35A rating is a "cutoff" limit, not a "comfortable continuous" limit. panasonic ncr21700t datasheet hot

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. The Panasonic NCR21700T Go to product viewer dialog

  1. Never exceed 4.85A charge current. Fast charging creates more heat than discharging. The datasheet specifies 4.85A max, but for longevity, stay at 2A.
  2. Add a copper heatsink wrap. In tubular flashlights, use thermal transfer tape to bond the cell to the metal body.
  3. Monitor voltage sag. If your device’s voltage drops from 4.0V to 3.2V under load, you are drawing too many amps. Back off.
  4. Use active cooling for packs. If building a 4S or 6S pack, include a 12V fan over the cells. At 15A per cell, a 6S pack (22.2V nominal) dissipates nearly 15 watts of heat across the pack.

Due to its high discharge rate and 4800mAh capacity, it is frequently used in: High-end power tools. Electric Vehicles (EVs) and E-bikes. High-performance flashlights. Custom battery packs for robotics. If the cell overheats drastically (thermal runaway), an

Datasheet Parameters

Performance reports indicate that testing typically stops if the surface temperature reaches to prevent cell degradation or thermal instability. Discharge Performance Data from the NCR21700 Datasheet shows characteristics for varying current loads: High-Drain Capability: The cell can handle continuous discharge currents of 5A, 10A, 15A, and up to 20A