Cell Type: Lithium-ion rechargeable cylindrical cell (21700 format) Nominal Voltage: ~3.63 V Standard Discharge Capacity: Min 4,900 mAh Typical Capacity (commercial data): ~5,000 mAh Dimensions: Diameter up to max 21.10 mm, Height up to max 70.15 mm Weight: Max approx 69.5 g
Max Charge Voltage: 4.20 V Discharge Cut-off Voltage: 2.50 V Max Continuous Discharge Current: ~9.8 A (approx 2 C) and Up to ~14.7 A (for short bursts) Cycle Life: ≥ 3,880 mAh remaining after 1,000 cycles (approx 80% of initial capacity) Operating Temperature Range:
What is the continuous and peak discharge current?
Continuous discharge current: 9.7 A (per DNK spec) for long-term use.
Pulse (non-continuous) discharge: up to 14.5 A according to spec sheet.
Discharge cut-off voltage is 2.5 V.
What is the cell’s behavior after long storage?
After 30 days stored at 60 °C, the cell can recover to ≥ 4,410 mAh, which is ~90% of its standard capacity per Samsung’s spec.
What is the operating temperature range?
Charge (ambient): 0 °C to 45 °C.
Discharge (ambient): –20 °C to 60 °C.
Cell surface max (for safety): during charge up to ~45 °C, and during discharge up to ~60 °C per spec.
Are there any special handling or protection considerations?
This is a plain (unprotected) cylindrical cell — you should use a BMS or protection circuit in any battery pack.
According to user reports, the printed markings on the bare cell can be removed if cleaned aggressively (e.g., with certain solvents), so care should be taken when applying heat shrink or tape.
Also, protection settings (like over-temperature protection) should be configured based on the cell’s surface temperature, not just the ambient, because of thermal considerations.
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