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| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Manufacturer | Misenpower | Model | INR21700-45E |
| Cell type | Rechargeable cylindrical lithium-ion cell | Nominal voltage | 3.7V |
| Nominal capacity | 4500mAh at 0.2C | Minimum capacity | 4400mAh at 0.2C |
| Nominal energy | Approx. 16.65Wh, calculated from 3.7V × 4.5Ah | Charge voltage | 4.2V |
| Standard charge | CC-CV at 0.5C (2.25A), 4.2V; stop at 0.05C (0.225A), at 25°C | Maximum charge current | 1C (4.5A); not for cycle-life operation |
| Standard discharge | 0.2C (0.9A) to 2.5V | Maximum continuous discharge | 3C (13.5A); not for cycle-life operation |
| Discharge cut-off | 2.5V | Internal resistance | <30mΩ AC impedance; meter frequency 1kHz |
| Cycle-life test | ≥80% capacity retention after 800 cycles at 25°C; 0.5C charge and 1C discharge to 2.75V | Operating temperature | Charge: 0 to 45°C; discharge: −20 to 60°C |
| Dimensions | Diameter ≤21.4mm; height ≤70.75mm | Weight | <76g |
| Specified shipping state | 3.500–3.700V open-circuit voltage; ≤30% SOC | Manufacturing location | China |
The INR21700-45E is a rechargeable 21700-format lithium-ion cell manufactured by Hengdian Group DMEGC in Zhejiang, China. Its specification lists 3.7V nominal voltage, 4500mAh nominal capacity and 4400mAh minimum capacity, with both capacity figures measured at 0.2C. It is supplied as a cell for integration into a suitably designed battery pack. Electrical protection, interconnections and application-level performance depend on the finished pack design.
At a 0.2C discharge rate, the manufacturer specifies 4500mAh nominal capacity and 4400mAh minimum capacity. Keeping these grades separate helps buyers compare cells and calculate pack configurations accurately. With a 3.7V nominal voltage, the nominal-capacity figure corresponds to approximately 16.65Wh per cell by calculation; actual delivered energy varies with operating conditions.
The cell drawing specifies a maximum diameter of 21.4mm and maximum height of 70.75mm, while the listed weight is below 76g. These limits provide a starting point for holder clearance, cell spacing and mechanical design. Confirm the intended connection method and production-batch dimensions before finalizing tooling or a tightly fitted enclosure.
The specified maximum continuous discharge rate is 3C, equivalent to 13.5A using the 4500mAh nominal capacity. DMEGC marks this maximum as “not for cycle,” so it should not be used to infer the stated 800-cycle performance. Pack current capability also depends on protection settings, interconnects, temperature and the number of cells connected in parallel.
Standard charging uses 0.5C constant current to 4.2V, followed by constant voltage until current falls to 0.05C, at 25°C. These rates correspond to approximately 2.25A and 0.225A respectively. The listed 1C maximum charge current is marked “not for cycle.” Charging must remain within the specified 0–45°C operating range.
DMEGC specifies charging from 0 to 45°C and discharging from −20 to 60°C, with AC internal resistance below 30mΩ measured using a 1kHz impedance meter. In its temperature test, discharge capacity at −10°C is at least 80% of the 25°C reference under the stated 1C procedure. Temperature limits and test results should be considered separately during pack design.
The specification states at least 80% capacity retention after 800 cycles under its 25°C test procedure: standard 0.5C charging, a five-minute rest, 1C discharge to 2.75V and another five-minute rest. DMEGC expressly limits this cycle-life result to those conditions. Different temperatures, cut-off settings or sustained operation at maximum current may produce different outcomes.
Custom battery pack applications: MisenBattery supplies cells and supports custom pack integration for suitable portable equipment and other projects after electrical and mechanical review. A finished pack needs a compatible BMS or protection circuit, appropriate overcurrent protection, welded interconnects, insulation and thermal design. DMEGC prohibits soldering directly to the cell. Ask for documentation applicable to the specific cell, pack configuration and shipment; certifications are not claimed by this listing.
