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Product Description:
The Samsung SDI INR21700-50S is a premium automotive-grade 21700 lithium-ion battery cell engineered for extreme high-power, high-torque applications. This 2-Pack bundle delivers a massive 5000mAh capacity per cell, an impressive 25A (5C) continuous discharge current, and an ultra-low internal resistance of just ≤12mΩ, providing explosive, sustained power for the most demanding devices.
Manufactured by Samsung SDI, this cell offers exceptional cycle life (≥90% capacity retention after 1000 cycles) and features a built-in safety valve with an automotive-grade explosion-proof design, safely venting internal gases to prevent swelling or rupture.
To suit your specific project needs, we offer 5 customized options:
Flat Top (2-Pack): Standard 21mm x 70mm flat terminal (≤11mΩ IR).
Button Top (2-Pack): 21mm x 73mm with a protruding nub for recessed contacts (≤14mΩ IR).
Spot-Welded Tabs (2-Pack): Pre-welded nickel strips for easy connection (≤11mΩ IR).
Wired (Red/Black) (2-Pack): Pre-soldered positive and negative wires for plug-and-play convenience.
Built-in Protection Board (2-Pack): Includes over-charge, over-discharge, and over-current protection (Discharge limit: 5A; Size: 21.5mm x 75mm).
Key Features:
2-Pack of Authentic Samsung SDI INR21700-50S 50S Cells: Premium automotive-grade 21700 Li-ion batteries.
5000mAh High Capacity: Provides massive energy for extended runtimes.
25A (5C) High Continuous Discharge: Delivers explosive 25A power output for high-torque power tools and electric vehicles.
Ultra-Low Internal Resistance (≤12mΩ): Ensures minimal heat generation and maximum power transfer efficiency.
1000+ Cycle Life (≥90% Retention): Offers excellent long-term value and durability.
Built-In Safety Valve: Automotive-grade explosion-proof design safely releases internal gases.
Automotive Grade Quality: Manufactured to Samsung's rigorous automotive standards for reliability and safety.
Versatile 5 Options: Choose from Flat Top, Button Top, Welded Tabs, Wired, or Protected versions.
Product Parameters (Based on Spec Sheet & Images):
Brand: Samsung SDI
Model: INR21700-50S
Size: 21700
Capacity: 5000mAh (Typical) / 4900mAh (Minimum)
Nominal Voltage: 3.7V
Full Charge Voltage: 4.2V
Continuous Discharge Current: 25A (5C) / 5A (Protected Version)
Internal Resistance: ≤12mΩ (Flat/Welded) / ≤14mΩ (Button)
Cycle Life: ≥ 1000 cycles (≥90% retention after 1000 cycles)
Safety: Positive terminal safety valve, automotive-grade explosion-proof design
Dimensions (Based on Variant):
Flat Top / Welded / Wired: 21mm (Dia) x 70mm (H)
Button Top: 21mm (Dia) x 73mm (H)
Protected Board: 21.5mm (Dia) x 75mm (H)
Pack Quantity: 2-Pack (Selectable)
Applications:
High-Torque Cordless Power Tools: Drives heavy-duty drills, impact drivers, and saws demanding 25A burst power.
Electric Scooters & Light Vehicles: Reliable power core for electric scooters, e-bikes, and golf carts.
High-Performance RC Hobbies & Drones: Sustained high-current power for high-torque RC cars and heavy-lift drones.
High-Capacity Portable Power Stations: Ideal core cell for building high-power portable energy storage systems.
Automotive & Industrial Equipment: Automotive-grade reliability for demanding industrial machinery and tools.
Frequently Asked Questions (FAQ):
Q1: What is the discharge current of this 50S battery?
A1: The Samsung 50S is rated for an impressive 25A (5C) continuous discharge current. This is significantly higher than standard cells, making it the perfect choice for high-torque power tools and electric vehicles.
Q2: What is the advantage of the ultra-low ≤12mΩ internal resistance?
A2: A ≤12mΩ internal resistance means this battery generates much less heat and loses very little energy during 25A high-current discharge. More power reaches your device, and the battery runs cooler, extending its lifespan.
Q3: What is the difference between the 5 variants?
A4: * Flat Top: Standard 70mm height, ≤11mΩ IR. * Button Top: 73mm height with protruding nub for recessed contacts, ≤14mΩ IR. * Welded Tabs: Pre-welded nickel strips for easy connection. * Wired: Pre-soldered red/black wires for plug-and-play. * Protected: Includes a protection board (5A, 75mm height) for enhanced safety.
Q4: What kind of charger should I use for this battery?
A5: You must use a charger specifically designed for 3.6V/3.7V Li-ion batteries with a 4.2V cut-off voltage. A smart charger with over-charge protection is highly recommended.
Free Shipping: Enjoy free shipping on all orders over $65. For orders under $65, the shipping cost is $8.99.
Delivery Time: Once shipped, orders typically arrive within 7–15 business days.
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.
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Samsung 50S sets the new standard for 21700 cells. Maximum capacity with serious power delivery. Highly recommended.
Temperature rise only 20¡«C at full discharge. Samsung thermal management is excellent. Safe for enclosed applications.
These will outlast most devices they're used in. Long-term investment that pays for itself.
Both cells at 3.54V. Factory fresh. Individually boxed. Professional packaging from authorized distributor.
5000mAh AND 25A discharge. 12mtimes IR is incredible. Best all-around 21700 cell on the market. Samsung engineering is unmatched.
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:
Condition: Items must be unused, undamaged, and in the same condition that you received them.
Packaging: Items must be returned in their original packaging with all accessories, manuals, and protective covers intact.
Proof of Purchase: A valid receipt, order confirmation email, or proof of purchase must accompany all returns.
Non-Returnable Items:
Batteries that have been installed, used, or show any signs of wear.
Items marked as “Final Sale” or “Clearance” at the time of purchase.
Customized or special-order products.
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:
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.
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.
Pack Securely: Place the item in its original packaging, include all accessories, and clearly write the RMA number on the outside of the box.
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
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.
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.
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.
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.
Partial Refunds: In certain situations, only partial refunds may be granted:
Items not in original condition, missing parts, or damaged for reasons not due to our error.
Items returned more than 30 days after delivery (reviewed on a case-by-case basis).
Non-Refundable Fees: Original shipping charges are non-refundable unless the return is due to our error (defective product or incorrect shipment).
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:
Email: support@oneandes.com
Phone: (213) 316-8849 (Mon-Fri, 9 AM – 5 PM Pacific Time)
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.
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