HY INR21700 3.7V 4500mAh Cylindrical Battery Cell
HY INR21700-4500mAh lithium-ion cylindrical cell with 3.7 V nominal voltage, 4500 mAh capacity and 16.65 Wh nominal energy. Maximum continuous discharge current: 13.5 A (3C).
3C
Discharge
Product overview
HY Lithium-ion Cell
Cell dimensions
Ø21.5 ± 0.3 × 70.9 ± 0.3 mm (diameter × height, including sleeve)
- Brand
- HY
- Nominal voltage
- 3.7 V
- Nominal capacity
- 4500 mAh / 4.5 Ah
- Calculated energy (listed voltage × capacity)
- 16.65 Wh (0.01665 kWh)
- Weight
- ≤71.0 g
- Cell type
- Cylindrical
Delivery Time
30–60 Days
Warranty & Support
30 days free return
Specifications
- Brand
- HY
- Model
- INR21700-4500mAh
- Dimensions
- Ø21.5 ± 0.3 × 70.9 ± 0.3 mm (diameter × height, including sleeve)
- Nominal voltage
- 3.7 V
- Nominal capacity
- 4500 mAh / 4.5 Ah
- Nominal energy
- 16.65 Wh (0.01665 kWh)
- Chemistry
- Lithium-ion
- Minimum capacity
- 4450 mAh at 0.5C, 4.2–2.75 V
- Capacity test rate
- 0.5C (specification table)
- Cell type
- 21700 cylindrical lithium-ion
- Weight
- ≤71.0 g
- Charge cut-off voltage
- 4.2 V
- Discharge cut-off voltage
- 2.75 V
- Standard charge current
- 2250 mA (0.5C)
- Recommended charge current
- 2250 mA (0.5C)
- Maximum charge current
- 4500 mA (1C)
- Recommended discharge current
- 2250 mA (0.5C)
- Maximum continuous discharge current
- 13500 mA / 13.5 A (3C)
- Maximum discharge current
- 13500 mA / 13.5 A (3C)
- Standard charge method
- CC/CV to 4.2 V; terminate at 45 mA (0.01C)
- Internal resistance
- ≤20 mΩ (AC impedance, 1000 Hz)
- Charging ambient temperature
- 0–45°C
- Discharging ambient temperature
- −20–60°C
- Charge surface temperature limits
- 0–60°C
- Discharge surface temperature limits
- −20–75°C
- Cycle life
- 500 cycles with ≥80% capacity retention; 0.5C charge / 3C discharge at 25 ± 2.5°C
FAQs
Is this a single cell or a complete battery pack?
This is one HY INR21700-4500mAh cylindrical lithium-ion cell. A battery pack needs an appropriate series/parallel configuration, BMS, connections, enclosure and thermal design.
What are the nominal capacity, voltage and energy?
Nominal capacity is 4500 mAh (4.5 Ah), nominal voltage is 3.7 V, and nominal energy is 16.65 Wh. The specification table lists a minimum capacity of 4450 mAh at 0.5C from 4.2 V to 2.75 V.
What is the maximum continuous discharge current?
The specification lists 13500 mA (13.5 A), or 3C, as the maximum continuous discharge current. This is a discharge rating, not a charging rate.
What charger settings does the cell specification require?
The standard method is CC/CV charging at 2250 mA (0.5C) to 4.2 V, followed by constant voltage charging until current falls to 45 mA. Maximum charge current is 4500 mA (1C). A complete pack requires a charger and protection system matched to its configuration.
What are the cell dimensions and weight?
Diameter is 21.5 ± 0.3 mm and height is 70.9 ± 0.3 mm, including the heat-shrink sleeve. Cell weight is no more than 71.0 g. Allow additional room for connections, insulation and pack hardware.
What temperature ranges apply?
Charging ambient temperature is 0–45°C; discharging ambient temperature is −20–60°C. The separate cell-surface temperature limits are 0–60°C during charge and −20–75°C during discharge.
What are the cycle-life test conditions?
The specification requires at least 80% capacity retention after 500 cycles using 0.5C charging and 3C discharging at 25 ± 2.5°C. Charge to 4.2 V, end CV charging at 0.01C, rest 5 minutes, discharge to 2.75 V and rest 10 minutes.
How can I request a quotation?
Use Get Price or WhatsApp and provide the quantity, destination and pack requirements. Delivery time is 30–60 days. Warranty & Support: 30 days free return.
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