For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
Samsung SDI 50G Version B 21700 Cell – 4900mAh – High-Capacity Lithium-Ion Battery - Check availability
Continuous discharge: 14.7A
The Samsung SDI INR21700-50G (Ver. B) is a 21700 lithium-ion rechargeable cell designed for battery-pack applications that need high capacity, solid energy density, and moderate continuous current capability.
Samsung specifies minimum 4,900mAh standard discharge capacity, 3.63V nominal voltage, and up to 14.7A continuous discharge at -20°C to 30°C, with 9.8A continuous discharge specified at 31°C to 60°C.
The Ver. B specification uses CC-CV charging to 4.20V, calls for 2,450mA standard charge current, and emphasizes proper pack protection, cell monitoring, and welded connections instead of direct soldering.
Specifications:
| Model | Samsung SDI INR21700-50G (Ver. B) |
| Size | 21700 |
| Standard Discharge Capacity | Min. 4900mAh |
| Rated Discharge Capacity | Min. 4753mAh |
| Approx. Nominal Energy | 17.8Wh (calculated from 3.63V × 4.90Ah) |
| Approx. Rated Energy | 17.3Wh (calculated from 3.63V × 4.753Ah) |
| Nominal Voltage | 3.63V |
| Charging Voltage | 4.20V |
| Discharge Cut-off Voltage | 2.50V |
| Charging Method | CC-CV (constant voltage with limited current) |
| Standard Charge Current | 2450mA (0.5C) CC-CV to 4.20V, 98mA cut-off @ RT |
| Standard Charge Time | 4 hours |
| Max Charge Current | 4900mA (1C, not for cycle life) |
| Max Continuous Discharge | 14.7A (3C) at -20°C to 30°C; 9.8A (2C) at 31°C to 60°C |
| Standard Discharge | 980mA (0.2C), 2.50V cut-off @ RT |
| Rated Discharge Test | 4900mA (1C), 2.50V cut-off @ RT |
| Chemistry | Lithium-ion |
| Manufacturing Site | Korea, China, Malaysia |
| Protected | No |
| Rechargeable | Yes |
| Initial Internal Impedance | ≤18mΩ at AC 1kHz |
| Approx. Weight | 71g max |
| Dimensions | Max. 21.50mm diameter × 70.85mm height |
| Operating Temperature | Charge: 0°C to 45°C / Discharge: -20°C to 60°C |
| Storage Characteristic | Capacity recovery ≥4410mAh after 20 days at 60°C (90% of standard capacity @ RT) |
| Recovery After Storage | 1 year: -20°C to 23°C; 3 months: -20°C to 45°C; 1 month: -20°C to 60°C |
| Cycle Life | ≥3802mAh after 500 cycles (80% of rated capacity @ RT); alternate test: ≥70% after 1000 cycles at 4.15V / 3.0V conditions |
| Safety Certifications | UN38.3, UL2580 annex B |
| Datasheet | Datasheet |
Applications:
- ✅ Long-Range E-Bikes
- ✅ Energy Storage Modules
- ✅ Portable Power Stations
- ✅ Solar Backup Battery Packs
- ✅ Endurance-Focused Custom Builds
DIY500AMP.COM Design – Samsung 50G Ver. B High-Capacity Pack Cell
⚠️ Safety Warning for Lithium-Ion Battery Usage
This cell should be used in a properly engineered battery pack with protective circuitry, cell-voltage monitoring, and over-temperature / over-voltage / over-current protection.
Do not solder directly to the cell, disassemble it, short the terminals, expose it to heat above 100°C, immerse it in water, or dispose of it in fire. Use only undamaged cells with intact sleeves and keep them away from loose metal objects.
Important Usage Guidelines:
- Battery Pack Use with Proper Protective Circuitry / BMS
- Spot Weld Tabs Only – Do Not Solder Directly
- Do Not Short-Circuit or Store with Loose Metal Objects
- Do Not Disassemble, Puncture, or Incinerate
- Do Not Charge Above 4.20V or Discharge Below 2.50V
- Use Only Within the Specified Temperature Range
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
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