ZK-IFR21700 3.2V 3200mAh 3C LiFePO4 Battery – 10.24Wh Energy, 1500+ Cycles ≥92% Retention for Bulk Power Stations & E-Bikes (64-Pack)
Description
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.
Shipping and Returns
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Free Shipping: Enjoy free shipping on all orders over $65. For orders under $65, the shipping cost is $8.99.
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Delivery Time: Once shipped, orders typically arrive within 7–15 business days.
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Easy Returns: We want you to be completely satisfied. If you're not, you can return your product within 30 days of receiving your order. Please ensure the items are unused and in their original condition. For return instructions, please contact our support team.
Payment & Security
Payment methods
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Security

Outstanding value for 64 quality LiFePO4 cells. ZK has earned my trust for future bulk purchases.
Prepped for spot welding. Clean nickel-plated terminals. Professional quality for pack building.
Palletized delivery. Each cell in protective packaging. Professional logistics for bulk order.
If you're building a large LiFePO4 system, this ZK 64-pack is the best value available.
Built a 48V 25.6Ah powerwall with these. 3200mAh per cell, 3C discharge. 1500+ cycle rating is excellent. ZK quality.
Refund Policy
OneAndes Return & Refund Policy
At OneAndes, we are committed to providing high-quality cylindrical lithium-ion batteries for your drones, vacuums, garden tools, and other power needs. If you are not completely satisfied with your purchase, we are here to help. Please read our full return policy below before initiating a return.
1. Return Window
You have 30 calendar days from the date you received your item(s) to request a return. Any return request submitted after 30 days will not be eligible for a refund or exchange.
2. Eligibility Conditions
To qualify for a return, all items must meet the following conditions:
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Condition: Items must be unused, undamaged, and in the same condition that you received them.
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Packaging: Items must be returned in their original packaging with all accessories, manuals, and protective covers intact.
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Proof of Purchase: A valid receipt, order confirmation email, or proof of purchase must accompany all returns.
Non-Returnable Items:
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Batteries that have been installed, used, or show any signs of wear.
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Items marked as “Final Sale” or “Clearance” at the time of purchase.
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Customized or special-order products.
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Gift cards.
If a returned item fails to meet these conditions, we reserve the right to deny the return or charge a restocking fee.
3. How to Initiate a Return
Follow these steps to return your product:
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Contact Us: Email our support team at support@oneandes.com with your order number and the reason for return. We aim to respond to all return requests within 24 hours on business days.
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Receive RMA: We will provide you with a Return Merchandise Authorization (RMA) number and return instructions. Do not ship any item without an RMA number.
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Pack Securely: Place the item in its original packaging, include all accessories, and clearly write the RMA number on the outside of the box.
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Ship to Our US Warehouse: Ship the package to the following address:
OneAndes Returns
10320 6th St
Rancho Cucamonga, CA 91730
USA*Important: Lithium-ion batteries are classified as hazardous materials (Class 9). Please follow the shipping guidelines provided in Section 4 below. We recommend using a trackable shipping service and purchasing shipping insurance, as we cannot guarantee receipt of your returned item.*
4. Return Shipping Costs
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Defective or Incorrect Items: If the item you received is defective, damaged in transit, or different from what you ordered, OneAndes will cover the return shipping cost. In this case, we will provide you with a prepaid return shipping label.
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Buyer’s Remorse / Non-Defective Returns: If you are returning an item for any other reason (e.g., no longer needed, ordered the wrong model), you are responsible for the return shipping costs. You must prepay the return shipping cost using a trackable carrier that accepts lithium batteries. We do not provide prepaid return labels for non-defective returns.
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Lithium Battery Shipping Regulations: By law, all returns must be shipped in compliance with applicable dangerous goods regulations. We will provide guidance on proper packaging and labeling. Failure to comply may result in carrier refusal, seizure, or additional fees. We are not responsible for returned items lost or rejected by the carrier due to improper shipping.
5. Refunds
Once we receive and inspect your return at our Rancho Cucamonga, CA facility, we will notify you via email of the approval or rejection of your refund.
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Approved Refunds: If approved, your refund will be processed to your original method of payment within 5 to 10 business days. Please note that depending on your bank or credit card issuer, it may take additional time for the credit to appear on your statement.
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Partial Refunds: In certain situations, only partial refunds may be granted:
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Items not in original condition, missing parts, or damaged for reasons not due to our error.
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Items returned more than 30 days after delivery (reviewed on a case-by-case basis).
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Non-Refundable Fees: Original shipping charges are non-refundable unless the return is due to our error (defective product or incorrect shipment).
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Restocking Fee: We do not charge a restocking fee for defect-free returns, but we may deduct the return shipping cost, which will be deducted from your refund.
6. Exchanges
We replace items only if they are defective or damaged upon arrival. If you need to exchange a defective item for the same product, please contact us at support@oneandes.com. Exchanges are subject to product availability.
If you ordered the wrong battery size or model, please follow the standard return process above and place a new order for the correct item.
7. Damaged or Missing Items
If your package arrives visibly damaged, please take photos of the package before opening and contact us immediately. We will work with the shipping carrier to file a claim and arrange for a replacement or refund. Damaged or missing item claims must be reported within 7 calendar days of delivery. For immediate assistance, you may also call us at (213) 316-8849.
8. Order Cancellation
You may cancel your order without penalty if it has not yet been shipped. To cancel, email us at support@oneandes.com as soon as possible. If the order has already been processed or shipped, you will need to follow the standard return process upon receipt.
9. Warranty
All OneAndes batteries are backed by a 12-month limited warranty against defects in materials and workmanship. This warranty does not cover damage caused by misuse, improper charging, unauthorized modifications, normal wear and tear, or use outside of manufacturer specifications. For warranty claims, please contact our support team.
10. Contact Us
If you have any questions about our Return & Refund Policy, please reach out:
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Email: support@oneandes.com
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Phone: (213) 316-8849 (Mon-Fri, 9 AM – 5 PM Pacific Time)
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Mailing Address: 10320 6th St, Rancho Cucamonga, CA 91730, USA
We aim to respond to all inquiries within 24 hours during business days. Please include your order number for faster assistance.
