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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Manufacturer | Misen | Model | ND21700-40H |
| Cell type | Rechargeable cylindrical lithium-ion cell | Format / chemistry | 21700 / INR lithium-ion |
| Nominal voltage | 3.7V | Nominal capacity | 4000mAh / 4.0Ah |
| Approx. nominal energy | 14.8Wh, calculated from 3.7V × 4.0Ah | Voltage limits | 4.20V charge cut-off; 2.75V discharge cut-off |
| Standard charge | 0.8A / 0.2C, CC/CV to 4.20V | Maximum charge | 12A / 3C; recommended cell temperature ≥10°C |
| Standard discharge | 2A / 0.5C | Maximum continuous discharge | 32A / 8C at ≥0°C |
| Cold-temperature continuous discharge | 20A / 5C from −10°C to below 0°C; 12A / 3C from −20°C to below −10°C | Peak discharge | 40A / 10C for no more than 5 seconds |
| AC internal resistance | ≤15mΩ at 1kHz | Relative humidity | 0–90% RH, non-condensing |
| Recommended charge temperature | 0°C to 45°C | Recommended discharge temperature | −20°C to 75°C |
| Dimensions | Diameter 21.7 ± 0.3mm; height 70.5 ± 0.3mm | Weight | Approximately 69.5g |
The ND21700-40H is a rechargeable 21700 high-rate lithium-ion cell with 3.7V nominal voltage and 4000mAh nominal capacity. The supplied technical summary lists 32A maximum continuous discharge, 40A peak discharge for up to 5 seconds and 12A maximum charging under suitable conditions. These figures make the cell a candidate for engineered high-power packs. MisenBattery can supply cells and support custom integration, subject to confirmation of the manufacturer's current limits and the intended thermal operating conditions.
The specified 4000mAh nominal capacity and 3.7V nominal voltage give approximately 14.8Wh of calculated nominal energy per cell. The 21700 cylindrical format can be arranged in series and parallel to meet an engineered pack's voltage and capacity targets. Final usable energy depends on discharge current, temperature, cut-off settings and the complete pack configuration.
The supplied specification lists a maximum continuous discharge of 32A, equivalent to 8C on a 4.0Ah capacity basis, at temperatures of 0°C or above. Lower-temperature limits are 20A from −10°C to below 0°C and 12A from −20°C to below −10°C. Pack designers should check cell temperature rise throughout the intended duty cycle.
Peak discharge is listed as 40A, or 10C, for no more than 5 seconds. This figure is separate from the 32A continuous rating and may help assess brief startup or acceleration loads. The supplied summary does not specify the permitted repeat interval or other peak-test conditions, so repeated bursts require confirmation and pack-level thermal validation.
Standard charging is specified as 0.8A using a CC/CV method with a 4.20V charge cut-off. The stated maximum charge current is 12A, with a recommended cell temperature of at least 10°C for high-rate charging. Charger design must also respect the overall 0°C to 45°C charge range and control cell temperature during operation.
AC internal resistance is specified as no more than 15mΩ at 1kHz. This provides a defined measurement point when comparing cells or checking incoming batches. It should not be treated as a direct measurement of DC voltage sag under a 32A load; interconnect resistance, cell state, temperature and current duration also affect pack performance.
The listed diameter is 21.7 ± 0.3mm, height is 70.5 ± 0.3mm and approximate weight is 69.5g. These values support early enclosure and mass estimates for power tools, robotics or light electric mobility packs. Final layout should account for cell tolerances, insulation, welded connections, cooling paths and the mechanical loads of the chosen application.
Custom battery pack applications: The ND21700-40H may be evaluated for power tools, cordless garden equipment, robotics and light electric mobility where its verified operating limits fit the load. MisenBattery supplies cells and supports custom pack integration with a compatible BMS, fuse protection, welded interconnects, temperature sensing, insulation and appropriate thermal and mechanical design. Request applicable CE, UN38.3, RoHS or UL documentation for the specific product and shipment; the supplied technical summary does not establish certification status.
