BAK N21700CG-50 21700 5000mAh 3.6V High-Capacity Li-ion Battery – 14.7A Max Discharge, 25mΩ Low IR for Power Stations & Energy Storage (2-Pack)
Description
Product Description:
The BAK N21700CG-50 is a premium-grade 21700 lithium-ion battery cell engineered for high-capacity energy storage and reliable power delivery. With a true 5000mAh (4900mAh typical) capacity and a stable 3.6V nominal voltage, this cell delivers exceptional energy density, making it the ideal core for high-capacity portable power stations, solar energy storage systems, and DIY battery pack assemblies.
Manufactured by BAK, a leading global lithium battery manufacturer, this cell features ultra-low internal resistance (≤25mΩ) and proven performance under sustained loads. According to the official specification sheet, it supports a 3C (14.7A) maximum discharge current for high-power bursts, and maintains a wide operating temperature range for reliable performance in various environments. With two cells included, you have the flexibility to power a single device, rotate batteries for continuous operation, or begin building your custom battery system.
Key Features:
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BAK N21700CG-50 High-Capacity Cell: Premium-grade 21700 Li-ion battery from the trusted brand BAK.
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5000mAh (4900mAh Typ.) True Capacity: Provides massive energy for extended runtimes.
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3.6V Nominal Voltage: Stable voltage output for consistent device performance.
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14.7A (3C) Max Discharge Current: Delivers high burst power for demanding applications (Note: For cycle life, standard 0.2C discharge is recommended).
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Ultra-Low Internal Resistance (≤25mΩ): Ensures minimal heat generation and maximum energy efficiency.
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Wide Operating Temperature: Supports charging from 0°C to 45°C and discharging from -20°C to 60°C.
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Professional Grade Quality: Manufactured by BAK with strict quality control and rigorous testing.
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Versatile Applications: Perfect for portable power stations, solar storage, and DIY battery projects.
Product Parameters (Based on the Provided Spec Sheet):
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Brand: BAK
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Model: N21700CG-50
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Size: 21700
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Typical Capacity: 4900mAh / 5000mAh (Typical)
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Nominal Voltage: 3.6V
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Charging Limited Voltage: 4.20V
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Standard Charging Current: 0.5C (2450mA)
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Max Charging Current: 1C (4900mA)
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Standard Discharge Current: 0.2C (980mA)
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Max Discharge Current: 3C (14.7A) – Not for cycle life; for burst usage only.
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Discharge Cut-off Voltage: 2.50V (Standard) / 2.00V (Absolute)
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Internal Resistance: ≤25mΩ (AC Impedance, 1000Hz)
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Weight: ≤70g (Measured: ~68.2g)
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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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Storage Temp: -20°C to 45°C (1-year recommend)
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Dimensions: 21.40mm (Max Diameter) x 70.75mm (Max Height)
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Pack Quantity: 2-Pack
Applications:
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High-Capacity Portable Power Stations: The ideal core cell for building large-capacity outdoor camping power stations and emergency backup power.
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Solar Energy Storage Systems: Reliable, high-capacity energy storage for off-grid solar setups and home backup systems.
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High-Performance LED Flashlights: Powers high-lumen searchlights and tactical flashlights for extended outdoor operations.
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DIY Battery Pack Assemblies: Perfect for building custom 12V/24V battery packs for various DIY projects.
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Electric Vehicle Conversions: Delivers long-lasting, stable power for retrofitting e-bikes and electric scooters.
Frequently Asked Questions (FAQ):
Q1: What is the discharge current of this battery?
A1: According to the official spec sheet, this cell supports a 3C (14.7A) maximum discharge current. However, please note that the spec sheet explicitly states "3C max discharge, not for cycle life." For daily use and maximizing cycle life, we recommend using a standard 0.2C (980mA) discharge.
Q2: What is the typical capacity of this battery?
A2: The BAK N21700CG-50 has a typical capacity of 4900mAh, with a maximum rated capacity of 5000mAh. This provides massive energy for extended runtimes in high-drain applications.
Q3: What kind of charger should I use for this battery?
A3: You must use a charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. We recommend using a high-quality smart charger with over-charge protection.
Q4: Is this battery safe for use in high temperatures?
A4: Yes. The spec sheet indicates a wide operating temperature range: discharging from -20°C to 60°C, and charging from 0°C to 45°C.
Q5: Can I use this battery to build a 12V battery pack?
A5: Yes. For a standard 12V system, you would connect 3 cells in series (3S) to achieve 10.8V nominal (3.6V x 3). Always use a BMS (Battery Management System) when building custom packs to ensure safety and balance.
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
Thick PVC wraps. Clear labeling with specifications. These look like quality cells.
Impressed with BAK quality. These 21700s are my go-to for future power station builds.
Competitive pricing for quality 21700 cells. BAK offers excellent performance per dollar.
Tested at 4980mAh and 5020mAh. BAK is honest with their ratings. 14.7A discharge is adequate for my power station.
Both cells in protective boxes. Voltage at 3.52V. Properly stored and shipped.
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.