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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Model | ND21700-4000mAh-3C / ND21700-40-3C | Cell type | Rechargeable cylindrical lithium-ion cell |
| Chemistry | NMC lithium-ion | Size designation | 21700 |
| Nominal voltage | 3.7V | Nominal capacity | 4000mAh / 4.0Ah |
| Nominal energy | Approx. 14.8Wh, calculated from 3.7V × 4.0Ah | Voltage limits | 4.20V charge cut-off; 2.75V discharge cut-off |
| Maximum charge current | 4A / 1C | Maximum continuous discharge | 12A / 3C |
| Peak discharge current | 16A / 4C; permitted duration not provided | Internal resistance | ≤21mΩ; measurement method not provided |
| Charge temperature | 0°C to 45°C | Discharge temperature | −20°C to 60°C |
| Storage temperature | −20°C to 45°C | Cycle life | ≥800 cycles; test conditions and capacity-retention threshold not provided |
| Diameter | Approximately 21.7mm | Height | Approximately 70.5mm |
| Weight | Approximately 69.5g | Product form | Bare cell for protected battery-pack integration |
The ND21700-4000mAh-3C, also listed as ND21700-40-3C in the supplied product parameters, is a 21700 rechargeable NMC lithium-ion cell. It combines 3.7V nominal voltage, 4000mAh nominal capacity and a stated 12A maximum continuous discharge current. Its compact cylindrical format makes it a candidate for professionally engineered custom battery packs. MisenBattery can supply the cell and assist with pack integration after the operating current, temperature range, protection circuit and mechanical design have been reviewed.
The stated 3.7V nominal voltage and 4000mAh nominal capacity identify this as a rechargeable NMC lithium-ion cell for designs requiring a defined 21700 electrical format. Its calculated nominal energy is approximately 14.8Wh per cell. Actual available energy in a finished battery pack depends on the load, discharge cut-off, temperature and protection settings.
The supplied dimensions are approximately 21.7mm in diameter and 70.5mm in height, with an approximate cell weight of 69.5g. These figures help estimate enclosure space and pack mass during early design. Confirm production tolerances, sleeve dimensions, terminal shape and interconnect clearance using the physical cell and approved mechanical drawing before finalizing a holder or welded assembly.
Maximum continuous discharge is listed as 12A, equivalent to 3C on the stated 4.0Ah capacity basis. A separate 16A, 4C peak figure is also supplied, but its permitted duration and test conditions are not defined. Engineers should size the pack around the verified continuous operating requirement and confirm any higher transient load with the manufacturer's full specification.
The supplied charge cut-off voltage is 4.20V, maximum charge current is 4A and charging temperature range is 0°C to 45°C. These values are inputs for charger and BMS selection; the supplied table does not specify a standard charging current or detailed termination method. Pack charging should include voltage and temperature monitoring suited to the finished configuration.
The supplied parameters list discharge from −20°C to 60°C and storage from −20°C to 45°C. Internal resistance is listed as no more than 21mΩ, although its measurement method and temperature are not provided. Operation near a temperature limit can change usable capacity and heat generation, so thermal design should be checked against the intended current profile.
Cycle life is listed as at least 800 cycles in the supplied parameter table. Charge and discharge rates, temperature, depth of discharge and the remaining-capacity threshold are not stated, so this number should be used only as a preliminary selection figure. Obtain the full cycle-test conditions before using it to predict service life or set a warranty target.
Custom battery pack applications: This bare cell may be evaluated for portable equipment and other custom 21700 battery packs whose electrical and environmental requirements fit its verified limits. MisenBattery supplies cells and supports custom pack integration with a compatible BMS, fusing, welded interconnects, temperature sensing, insulation and suitable thermal and mechanical design. Request the applicable CE, UN38.3, RoHS or UL documentation for the specific product and shipment; none is established by the supplied parameter table.
