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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Manufacturer | Samsung SDI Co., Ltd. | Model | INR21700-40T |
| Cell type | Rechargeable cylindrical lithium-ion cell | Nominal voltage | 3.6V |
| Standard capacity | Minimum 4,000mAh; 0.8A discharge to 2.5V at room temperature after standard charge | Rated capacity | Minimum 3,900mAh; 10A discharge to 2.5V at room temperature after rated charge |
| Calculated energy | Approx. 14.4Wh based on 3.6V × 4.0Ah standard capacity | Maximum weight | 70.0g |
| Maximum dimensions | Diameter 21.22mm × height 70.30mm, with insulating tube | Discharge cut-off | 2.5V cell specification |
| Standard charge | CC-CV, 2A, 4.20V, 200mA cut-off; approximately 180 minutes at room temperature | Rated charge | CC-CV, 6A, 4.20V, 100mA cut-off; approximately 70 minutes at room temperature |
| Continuous discharge | 35A without temperature cut | Temperature-controlled discharge | 45A with 80°C cell-surface temperature cut |
| Initial impedance | ≤12mΩ, AC 1kHz after rated charge | Cycle-life test | ≥2,400mAh after 250 cycles; 6A charge and 35A discharge at room temperature |
| Ambient temperature | Charge: 0 to 45°C; discharge: −20 to 60°C | Cell-surface limits | Charge: 0 to 50°C; discharge: −20 to 80°C, subject to specified protection and release conditions |
| Ex-factory voltage | 3.340 to 3.490V | Pack connection | Weld leads to terminals; do not solder directly to cells |
The Samsung SDI INR21700-40T is a rechargeable lithium-ion cell specified for power tool applications. Its 3.6V nominal voltage, minimum 4,000mAh standard discharge capacity and defined high-current conditions make it a candidate for professionally engineered battery packs. MisenBattery can support cell sourcing and custom pack integration. Current, temperature, charging and protection limits must be applied to the finished design; the bare cell is not a protected battery.
Standard discharge capacity is at least 4,000mAh when tested at 0.8A after standard charging. The separately specified rated discharge capacity is at least 3,900mAh at 10A after rated charging. Keeping these test conditions attached to each figure helps buyers compare cells and estimate performance under their intended pack load.
The drawing specifies a maximum diameter of 21.22mm and height of 70.30mm with the insulating tube; maximum cell weight is 70.0g. At 3.6V and the 4.0Ah standard capacity basis, calculated nominal energy is approximately 14.4Wh per cell. Use the maximum dimensions when planning holders and pack clearances.
Samsung SDI specifies 35A maximum continuous discharge without a temperature cut. The separate 45A condition requires an 80°C cell-surface temperature cut. These are distinct operating conditions: a pack intended to use the higher current needs correctly positioned temperature sensing and protection settings based on the hottest cell surface.
Standard charging uses 2A to 4.20V with a 200mA cut-off and is listed at approximately 180 minutes at room temperature. Rated charging uses 6A to 4.20V with a 100mA cut-off and is listed at approximately 70 minutes. Charge controls must also respect the specified temperature limits.
Initial internal impedance is limited to 12mΩ when measured at AC 1kHz after rated charge. The specification lists ambient operation at 0–45°C for charging and −20–60°C for discharging. It separately gives cell-surface limits and release conditions; these surface figures should not be substituted for ambient operating limits.
The specified 250-cycle test requires at least 2,400mAh remaining capacity, equal to 60% of the 4,000mAh standard capacity. That test uses 6A CC-CV charging to 4.20V with a 100mA cut-off, followed by 35A discharge to 2.5V at room temperature. Results under other conditions may differ.
Custom battery pack applications: MisenBattery supplies cells and supports custom power tool pack integration subject to the intended load and environmental requirements. The finished pack needs a suitable BMS or protection circuit, overcurrent protection, cell-voltage monitoring, temperature sensing, insulation, welded interconnects and mechanical spacing. Samsung SDI recommends more than 1mm between cells and prohibits direct soldering to cell terminals. Confirm applicable product and shipment documentation before stating any certification or approval.
