Ncr21700t Datasheet __exclusive__ - Panasonic
The Panasonic NCR21700T is a high-performance, cylindrical lithium-ion cell designed for applications requiring a balance of extreme energy density and high discharge capabilities. Often cited as a "Tesla-grade" cell, it is a staple in high-drain power tools, electric bikes, and custom battery packs. Core Technical Specifications
Key nominal specifications (typical ranges from manufacturer specs, reseller catalogs and independent characterization)
- Form factor: 21700 cylindrical (≈21.0 mm diameter × ≈70.0 mm length)
- Nominal voltage: ≈3.6–3.7 V
- Typical capacity: ≈4,900–5,000 mAh (5.0 Ah class)
- Charge termination voltage: 4.20 ± 0.05 V
- Standard/continuous discharge: often quoted 10–15 A in vendor sheets (designs emphasize energy, typical safe continuous range ~6–15 A depending on thermal management)
- Pulse/peak discharge: vendors and resellers list pulses up to ~20–40 A (short durations, dependent on temperature)
- Internal resistance: typically in the low tens of milliohms (e.g., ≤14 mΩ reported in some vendor spec tables)
- Mass: ~66–70 g
- Recommended charge method: CC‑CV
- Cut‑off/discharge end voltage: often 2.5–3.0 V (system dependent)
- Cycle life: vendor claims vary; typical expectation for NCR‑style high‑capacity cells is several hundred cycles to ~80% capacity, with >500 cycles possible under conservative C‑rates and temperature control
- Operating temperature: charge and discharge windows published by vendors (charge typically 0–45–60 °C range; discharge: −10–45 °C typical)
Note: exact figures vary by data source and production batch; use the official Panasonic datasheet for critical designs.
- The catch: That 500 cycles is rated at a 0.5C charge (approx 2.25A) and 0.5C discharge. If you rapid charge at 4A or discharge at 35A every time, your cycle life drops significantly to maybe 250-300 cycles.
This makes the NCR21700T ideal for low-to-medium drain long-life applications like solar storage, not for racing drones. panasonic ncr21700t datasheet