Panasonic Ncr21700t - Datasheet

Data parsed from official testing documentation yields a distinct profile for the bare cell: NCR21700 data sheet

Shut down operation if internal pack temperatures exceed 60∘C60 raised to the composed with power C during discharge or 45∘C45 raised to the composed with power C during charging.

Do not charge below 0°C. Lithium plating occurs, causing internal short circuits. Also, do not float charge – terminate when current drops to <100 mA.

Stage 1: Constant Current (CC) | Stage 2: Constant Voltage (CV) (Current is capped; Voltage rises) | (Voltage is locked; Current drops) --------------------------------------|------------------------------------ Current (A) : [====== Capped ======] | Current (A) : [== Tapering Down =>] Voltage (V) : [== Rising to 4.2V ==] | Voltage (V) : [==== Locked 4.2V ===] panasonic ncr21700t datasheet

This is a bare cell ; it must be used with a Battery Management System (BMS).

The “NCR“ prefix in the model name is an important technical indicator. NCR stands for , a cathode chemistry that combines lithium‑nickel‑cobalt‑aluminum (NCA) or lithium‑nickel‑cobalt‑manganese (NCM) formulations. This chemistry delivers:

According to the official Panasonic NCR21700 Datasheet , the cell features the following core parameters: Typical capacity of 5000mAh (minimum 4900mAh). Nominal Voltage: 3.6V . Charging Voltage: 4.20V using the CC-CV method. Data parsed from official testing documentation yields a

The datasheet includes a cycle life curve showing:

NCR21700T Type: Rechargeable Li-ion (Nickel-Cobalt-Aluminum Oxide chemistry) Nominal Voltage: 3.6 V Typical Capacity: 4500 – 4800 mAh (depending on discharge rate) Minimum Capacity: 4350 mAh Energy: ~16.2 Wh

German battery forum discussions note that while the cell can theoretically handle 30 A discharge currents, the usable energy drops significantly when discharged at higher rates, particularly if the cut‑off voltage is set above 3.0 V. In other words, the cell is high‑capacity but not truly high‑power; pushing it beyond its rated continuous current will result in diminished performance and potentially reduced service life. Also, do not float charge – terminate when

The “21700“ designation indicates a cylindrical cell measuring approximately . Exact measurements are:

For context, a standard high-quality 18650 cell typically offers between 3000 mAh and 3500 mAh. By switching to the 21700 format and the NCR21700T chemistry, designers gain nearly 50% more capacity per cell. This reduction in cell count (fewer cells needed to achieve a target Watt-hour rating) simplifies Battery Management Systems (BMS) and reduces welding points, increasing overall pack reliability.

For mechanical design, the datasheet provides exact dimensions:

As an unprotected cell, the Panasonic NCR21700T requires careful handling and appropriate safety measures.