Description
The Samsung INR21700-50E is a high-capacity 21700 lithium-ion cell manufactured by Samsung SDI, with a nominal capacity of 5000mAh. It is an energy-optimized cell designed for medium-power applications requiring long runtime. Built on INR nickel-manganese chemistry, it delivers a continuous discharge current of approximately 10A (some sources rate it at 15A maximum), with pulse discharge up to 14.7A. This product is available in five configurations: flat top, button top, spot welded tabs, pre-wired leads, and protected top. The 10-pack format supports applications ranging from DIY battery pack assembly to drop-in replacements. As a bare cell, the 50E requires a BMS-equipped system, making it suitable for e-bikes, power tools, energy storage systems, and custom battery pack projects.
Key Features
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5000mAh High Capacity: Genuine Samsung SDI cell with high energy density, approximately 18.15Wh per cell, ideal for long-runtime applications
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10A–15A Continuous Discharge: Energy-focused design with excellent temperature control and stable discharge plateau under moderate loads
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Low Internal Resistance ~13–15mΩ: Reduced voltage sag and heat generation during high-current discharge
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Multiple Configuration Options: Flat top, button top, spot welded tabs, pre-wired leads, and protected top versions for different assembly and usage scenarios
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Cycle Life ≥500 Cycles: ≥80% capacity retention (≥3802mAh) after 500 cycles
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10-Pack Bulk Packaging: Ideal for pack assembly, repair replacements, and bulk spares
Parameters
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Brand: Samsung SDI
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Model: INR21700-50E
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Battery Type: INR Li-ion (Nickel Manganese)
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Size: 21700 (21.25mm diameter × 70.8mm height)
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Nominal Capacity: 4900mAh (standard discharge) / 5000mAh (nominal)
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Rated Capacity: 4753mAh (1C discharge)
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Nominal Voltage: 3.6V / 3.63V
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Charge Cut-off Voltage: 4.2V
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Discharge Cut-off Voltage: 2.5V
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Max Continuous Discharge Current: 9.8A / 10A (some sources rate 15A)
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Max Pulse Discharge Current: 14.7A
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Internal Resistance: Approx. 13–15mΩ (AC 1kHz)
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Standard Charging Current: 2450mA (0.5C)
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Max Charging Current: 4900mA (1C)
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Weight: Approx. 69g
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Cycle Life: ≥500 cycles (≥80% capacity retention)
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Operating Temperature: Charging 0°C ~ 45°C; Discharging -20°C ~ 60°C
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Version: Flat Top / Button Top / Spot Welded Tabs / Pre-Wired / Protected Top
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Pack Quantity: 10-Pack
Applications
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E-Bike and e-scooter battery packs
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Portable power stations and power bank assemblies
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Power tools (moderate-power, not high-burst applications)
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Solar energy storage systems and backup power
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DIY battery pack assembly, repair replacements, and custom pack builds
FAQ
Q1: What is the capacity of the INR21700-50E?
A: Standard discharge capacity is 4900mAh (0.2C discharge), rated capacity is 4753mAh (1C discharge), and nominal capacity is typically listed as 5000mAh.
Q2: What is the maximum continuous discharge current?
A: According to Samsung SDI specifications, the maximum continuous discharge current is 9.8A (approximately 10A), with a maximum pulse discharge current of 14.7A. Some market listings rate it at 15A, but the original specification should be considered authoritative.
Q3: What are the differences between flat top, button top, welded tabs, pre-wired, and protected versions?
A: Flat top suits standard battery compartments or spot-welding assembly. Button top fits spring-loaded contacts. Welded tabs are for direct spot-welding into packs. Pre-wired leads suit quick replacement or solder-free applications. Protected versions include built-in overcharge/over-discharge/short-circuit protection, suitable for single-cell use without a BMS.
Q4: Does this cell have a protection circuit?
A: Standard, welded tab, and pre-wired versions are unprotected bare cells and must be used with a BMS or protected devices. The protected top version includes built-in protection circuitry, suitable for standalone single-cell use.
Q5: How should I charge it?
A: Use CC-CV (constant current, constant voltage) charging with a cut-off voltage of 4.2V. Standard charge current is 2450mA, with a maximum of 4900mA. Do not use chargers not specifically designed for Li-ion cells.
Q6: How should I store the 10-pack?
A: Store in a cool, dry place (long-term storage recommended at -20°C to 20°C), keep at approximately 40%–60% state of charge, and use insulating protective cases to prevent short circuits.
