Product Description:
The ZK-IFR21700 is a premium-grade 21700 lithium iron phosphate (LiFePO4) battery engineered for high-capacity energy storage and reliable power delivery. This 64-Pack bulk bundle delivers a high-capacity 3200mAh (3.2Ah), 10.24Wh of energy, and a stable 3C (9.6A) continuous discharge current. With its standard 21700 form factor, it is the ideal core cell for large-scale battery pack assembly, e-bike conversions, and professional DIY energy storage projects.
What truly sets this battery apart is its exceptional longevity. According to the official cycle life curve, it maintains ≥92% capacity retention even after 1500 full cycles at 1C charge/discharge. Manufactured with advanced LiFePO4 chemistry and rigorous quality control, this cell offers superior thermal stability, an ultra-low internal resistance of ≤22mΩ, and enhanced safety against overcharging and short circuits.
Key Features:
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High-Capacity 3200mAh Cell: Delivers 10.24Wh of reliable energy for extended runtimes.
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3C (9.6A) Stable Discharge: Provides a stable 9.6A continuous discharge current for medium-to-high power applications.
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Ultra-Long 1500+ Cycle Life (≥92% Retention): Maintains over 92% of its original capacity after 1500 full cycles, providing exceptional long-term value.
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Ultra-Low Internal Resistance (≤22mΩ): Ensures minimal heat generation and efficient energy transfer during heavy loads.
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Advanced LiFePO4 Safety Chemistry: Superior thermal stability, explosion-proof design, and enhanced safety against overcharging and short circuits.
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Wide Operating Temperature: Supports discharging from -20°C to 60°C and charging from 0°C to 45°C.
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Professional Bulk Packaging: 64 cells in bulk pack, ideal for battery pack factories, manufacturers, and large-scale energy projects.
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Versatile Applications: Perfect for bulk battery assembly, e-bike battery packs, solar storage, and portable power stations.
Product Parameters:
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Brand: ZK
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Model: IFR21700
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Size: 21700
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Capacity: 3200mAh / 3.2Ah
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Energy: 10.24Wh
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Nominal Voltage: 3.2V
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Full Charge Voltage: 3.65V
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Discharge Cut-off Voltage: 2.0V
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Chemistry: LiFePO4 (Lithium Iron Phosphate)
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Discharge Rate: 3C
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Max Continuous Discharge Current: 9.6A
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Internal Resistance: ≤22mΩ
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Cycle Life: ≥ 1500 cycles (≥92% retention at 1C/1C)
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Standard Charging Current: 1600mA
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Max Charging Current: 3200mA
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Operating Temp - Charging: 0°C to 45°C
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Operating Temp - Discharging: -20°C to 60°C
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Dimensions: 21.6mm (Diameter) x 71mm (Height)
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Weight: ≤72g
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Pack Quantity: 64-Pack
Applications:
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Industrial Battery Pack Assembly: Ideal core cell for factories and workshops assembling 12V, 24V, and 48V battery packs for electric vehicles and energy storage.
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E-Bike & E-Scooter Battery Packs: Reliable high-capacity cells for retrofitting and manufacturing electric bicycle and scooter battery systems.
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Solar Energy Storage Systems: Long-lasting, high-capacity energy storage for off-grid solar setups and home backup systems.
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Large-Capacity Portable Power Stations: Core cell for building professional-grade portable power stations and outdoor energy supplies.
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Grid & Telecom Backup Power: Reliable power for industrial UPS systems, telecom backup batteries, and critical infrastructure.
Frequently Asked Questions (FAQ):
Q1: What is the discharge current of this battery?
A1: This ZK-IFR21700 is rated for a 3C continuous discharge, which equates to a stable 9.6A discharge current (3200mAh × 3). This makes it suitable for e-bike conversions, portable power stations, and medium-power tools.
Q2: What is the advantage of the 1500+ cycle life?
A2: According to the official test data, this cell maintains over 92% of its original capacity after 1500 full cycles at 1C charge/discharge. This is significantly higher than standard cells, offering exceptional long-term value and drastically reducing replacement costs.
Q3: Is this battery safe to use in e-bike battery packs?
A3: Absolutely. With its stable 3C (9.6A) discharge rate, high 3200mAh capacity, and ultra-long cycle life, this cell is an excellent choice for e-bike battery pack assembly. Always ensure your BMS is properly configured for 3.2V LiFePO4 cells.
Q4: What is the internal resistance of this battery?
A4: The internal resistance is ≤22mΩ, which ensures minimal heat generation and maximum energy transfer efficiency during high-load discharge.
Q5: What kind of charger should I use for this battery?
A5: You must use a charger specifically designed for 3.2V LiFePO4 batteries with a 3.65V cut-off voltage. A smart charger capable of delivering up to 3.2A (1C) is recommended for optimal charging.
