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SAMSUNG INR21700-48X
SAMSUNG INR21700-48X
Technical Specifications
Cell Type: Lithium-ion rechargeable cylindrical cell (21700 format)
Nominal Voltage: 3.64 V
Typical Capacity: 4,800 mAh (Min. 4,650 mAh)
Dimensions: Diameter approx. 21.15 mm, Height approx. 70.65 mm
Weight: Max approx. 69.5 g
Max Charging Voltage: 4.20 V (4.15 V for extended cycle-life variant)
Discharge Cut-off Voltage: 2.5 V (3.0 V for extended cycle-life)
Standard Charge Current: ~0.33 C (≈1,584 mA)
Max Continuous Discharge Current: Up to ~9.6 A (approx. 2 C) in standard use
Operating Temperature Range:
Discharge: -20 °C to 60 °C

Key Performance Highlights
- High Energy Capacity: Typical capacity about 4,800 mAh, with a standard discharge capacity of 4,650 mAh. Nominal Voltage: ~3.64 V.
- Good Discharge Performance: Maintains 100% capacity at up to 1 C (4,800 mA); at 1.5 C (~7,200 mA) it retains ~85%, and at 2 C (~9,600 mA) it retains ~80%.
- Long Cycle Life:
- Cycle Life 1: ≥ 70% capacity after 500 cycles (4.20 V ↔ 2.50 V).
Cycle Life 2: ≥ 70% capacity after 1,500 cycles (4.15 V ↔ 3.00 V). - Excellent Storage Recovery: After 28 days at room temperature, the cell recovers ≥ 90% of its capacity.
- Low Internal Resistance: ≤ 18 mΩ (AC, after standard charge), which helps reduce energy loss and improve efficiency.
- Wide Temperature Range:
Charge: 0 °C to 45 °C.
Discharge: –20 °C to 60 °C. - Robust Safety & Certification: Complies with UN38.3 for transport safety per spec sheet.
- Compact & Durable Design: Weighs up to 69.5 g, with a cell height of ~70.80 mm and diameter ~21.25 mm.
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Frequently Asked Questions
What are the key specifications (dimensions, weight, voltage)?
- Cell size: 21.25 mm diameter × 70.80 mm height.
- Nominal voltage: 3.64 V.
- Max weight: 69.5 g per datasheet.
What is the rated capacity and discharge behavior?
- Typical capacity: 4,800 mAh, minimum ≥ 4,650 mAh for standard discharge.
- Discharge cut-off (standard): 2.50 V; for extended cycle life mode: 3.00 V.
- Discharge characteristics: at 1.0C (~4,800 mA), 100% capacity; at 1.5C (~7,200 mA), ~85%; at 2.0C (~9,600 mA), ~80%.
What are the recommended charging conditions?
- Charging method: CC-CV.
- Charge voltage: 4.20 V (or 4.15 V for better cycle life).
- Recommended standard charge current: 0.33C (~1,584 mA).
How many charge/discharge cycles can this cell support?
- Cycle Life 1: ≥ 500 cycles at 1.0C (4.2V ↔ 2.5V) with ≥70% remaining capacity.
- Cycle Life 2: ≥ 1,500 cycles at 1.0C (4.15V ↔ 3.0V) with ≥70% capacity.
- According to independent review (Lygte-info), the cell is considered “high cycle life.”