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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Manufacturer | Samsung SDI Co., Ltd. | Model | INR21700-50G (Ver. B) |
| Cell type | Rechargeable cylindrical lithium-ion cell | Nominal voltage | 3.63V |
| Standard capacity | Minimum 4,900mAh; 0.2C discharge to 2.50V at room temperature after standard charge | Rated capacity | Minimum 4,753mAh; 1C discharge to 2.50V at room temperature after standard charge |
| Calculated energy | Approx. 17.79Wh, based on 3.63V × 4.9Ah standard capacity | Maximum weight | 71g |
| Maximum dimensions | Diameter 21.50mm × height 70.85mm | Initial impedance | ≤18mΩ, AC 1kHz after standard charge |
| Standard charge | CC-CV, 2.45A to 4.2V, 98mA cut-off; specified time 4 hours | Maximum charge | 4.9A; not for cycle life |
| Continuous discharge at −20 to 30°C | Maximum 14.7A (3C) | Continuous discharge at 31 to 60°C | Maximum 9.8A (2C) |
| Charge temperature | 0 to 45°C ambient | Discharge temperature | −20 to 60°C ambient |
| 500-cycle test | ≥3,802mAh after 500 cycles; 2.45A charge to 4.2V and 4.9A discharge to 2.50V at room temperature | 1,000-cycle test | ≥70% of initial discharge capacity; 1.617A charge to 4.15V and 4.9A discharge to 3.0V at room temperature |
| Ex-factory voltage | 3.43 to 3.63V | Cell connection | Weld leads to terminals; do not solder directly to the cell |
The Samsung SDI INR21700-50G (Ver. B) is a rechargeable cylindrical lithium-ion cell with 3.63V nominal voltage and a minimum 4,900mAh standard discharge capacity. Its specification separates standard and rated capacity, provides two continuous discharge limits by ambient temperature, and defines two distinct cycle-life tests. MisenBattery can support professional cell sourcing and custom battery pack integration, subject to verification of supply authorization and the finished pack's electrical, thermal and mechanical requirements.
Standard discharge capacity is at least 4,900mAh at 0.2C to a 2.50V cut-off after standard charging at room temperature. Rated discharge capacity is at least 4,753mAh when discharge rises to 1C under the stated test conditions. Pack runtime estimates should account for this difference and the intended operating load.
The outline drawing specifies a maximum diameter of 21.50mm and maximum height of 70.85mm; cell weight is limited to 71g. Using 3.63V nominal voltage and the 4.9Ah standard capacity basis gives approximately 17.79Wh of calculated nominal energy per cell. Allow for the stated dimensions in holder and pack design.
Maximum continuous discharge is 14.7A from −20 to 30°C ambient and 9.8A from 31 to 60°C ambient. This temperature split is part of the current rating, so thermal behavior must be considered when setting pack protection. The specification also notes that maximum discharge conditions do not guarantee cycle life.
Samsung SDI specifies CC-CV charging to 4.2V. Standard charge current is 2.45A, with a 98mA cut-off for the standard capacity test and an approximately four-hour specified charging time. A separate 4.9A maximum charge current is marked as not for cycle life. Charging is limited to 0–45°C ambient.
Initial internal impedance is specified at no more than 18mΩ, measured at AC 1kHz after standard charge. Pack design must include cell-voltage and temperature monitoring as well as suitable overcurrent protection. Samsung SDI specifies that discharge over-temperature protection must not be set above 70°C at the hottest relevant cell surface.
One test specifies at least 3,802mAh after 500 cycles using 4.2V charging and a 2.50V discharge cut-off. A second specifies at least 70% of initial discharge capacity after 1,000 cycles, but uses 4.15V charging and a 3.0V discharge cut-off. The two results describe different test conditions.
Custom battery pack applications: MisenBattery supplies cells and supports custom pack integration for professionally designed equipment whose requirements match the verified cell limits. A finished pack needs a compatible BMS, suitable fusing, voltage and temperature sensing, insulation, welded interconnects, spacing and thermal design. Samsung SDI recommends more than 1mm between cells and prohibits direct soldering to cell terminals. Confirm supply authorization and applicable product and shipment documents before making certification claims.
