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The Samsung INR21700-50S is a high-power 21700 lithium-ion cell manufactured by Samsung SDI, with a nominal capacity of 5000mAh, designed for applications demanding sustained high current and high energy density. Released in 2020, this cell features a high-nickel cathode and graphite/silicon additive anode, delivering an energy density of approximately 250Wh/kg and class-leading gravimetric and volumetric power density for the 21700 format. Its maximum continuous discharge is 25A (without temperature cut), and with 80°C temperature protection, it can reach 45A pulse discharge, making it ideal for power tools, e-bikes, drones, and high-power battery pack assembly.
This product is available in five configurations: flat top, button top, spot welded tabs, pre-wired leads, and protected top. The 10-pack format supports applications ranging from DIY battery pack assembly to drop-in replacements. As a bare cell, the standard 50S requires a BMS-equipped system.
5000mAh High Capacity: Genuine Samsung SDI cell with typical standard discharge capacity of 5000mAh and minimum rated capacity of 4800mAh (6A charge / 10A discharge)
25A Continuous / 45A Pulse Discharge: 25A continuous without temperature cut; 45A with 80°C temperature cut, suitable for high-power load applications
Low Internal Resistance ≤14mΩ: Reduced voltage sag and heat generation during high-current discharge
High Energy Density: ~250Wh/kg gravimetric energy density and ~2250W/kg power density, outstanding among 21700 high-power cells
Five Configuration Options: Flat top, button top, spot welded tabs, pre-wired leads, and protected top for different assembly and usage scenarios
10-Pack Bulk Packaging: Ideal for pack assembly, repair replacements, and bulk spares
| Parameter | Specification |
|---|---|
| Brand | Samsung SDI |
| Model | INR21700-50S |
| Battery Type | Li-ion (high-Ni cathode + graphite/Si additive anode) |
| Size | 21700 (21.25mm diameter × 70.62mm height) |
| Standard Discharge Capacity | Typ. 5000mAh (0.5C charge / 0.2C discharge to 2.5V) |
| Rated Discharge Capacity | Min. 4800mAh (6A charge / 10A discharge to 2.5V) |
| Nominal Voltage | 3.6V |
| Charge Cut-off Voltage | 4.2V |
| Discharge Cut-off Voltage | 2.5V |
| Max Continuous Discharge | 25A (without temperature cut) |
| Temperature-Cut Discharge | 45A (80°C cut-off, re-discharge release <50°C) |
| Internal Resistance | ≤14mΩ (AC 1kHz, after rated charge) |
| Standard Charge | CCCV, 2.5A, 4.20V, 250mA cut-off |
| Rated Charge | CCCV, 6A, 4.20V, 100mA cut-off |
| Max Charge Current | 10A (step charge) / 6A (continuous) |
| Weight | ≤72g |
| Cycle Life | ≥2940mAh after 250 cycles (25A discharge) / ≥2940mAh after 100 cycles (45A discharge) |
| Operating Temperature (Charge) | 0°C ~ 50°C (recommended release <45°C) |
| Operating Temperature (Discharge) | -20°C ~ 80°C (release requires <60°C) |
| Version | Flat Top / Button Top / Spot Welded Tabs / Pre-Wired / Protected Top |
| Pack Quantity | 10-Pack |
E-Bikes and e-scooters: High power output for acceleration and hill climbing
Power tools: Cordless drills, angle grinders, saws, and other high-drain tool battery packs
Drones and RC models: High energy density and discharge rate for both range and power
Portable energy storage: Solar storage and outdoor power station battery packs
DIY battery pack assembly: Welded tabs and pre-wired versions for spot welding and quick connections
Robotics, electric wheelchairs, and other industrial/mobile equipment
Q1: What is the capacity of the INR21700-50S?
A: Standard discharge capacity is typically 5000mAh (0.5C charge, 0.2C discharge to 2.5V), with a minimum rated capacity of 4800mAh (6A charge, 10A discharge to 2.5V).
Q2: What is the maximum discharge current?
A: Maximum continuous discharge is 25A without temperature cut. With 80°C temperature cut-off and re-discharge release below 50°C, it can support up to 45A pulse discharge.
Q3: What are the differences between flat top, button top, welded tabs, pre-wired, and protected versions?
A: Flat top suits standard battery compartments or spot-welding assembly. Button top fits spring-loaded contacts. Welded tabs are for direct spot-welding into packs. Pre-wired leads suit quick replacement or solder-free applications. Protected versions include built-in overcharge/over-discharge/short-circuit protection, suitable for single-cell use without a BMS.
Q4: Does this cell have a protection circuit?
A: Standard, welded tab, and pre-wired versions are unprotected bare cells and must be used with a BMS or protected devices. The protected top version includes built-in protection circuitry, suitable for standalone single-cell use.
Q5: How should I charge it?
A: Use CC-CV (constant current, constant voltage) charging. Standard charge is 2.5A, 4.20V, 250mA cut-off; rated charge is up to 6A continuous / 10A step charge, 4.20V, 100mA cut-off. Charge and discharge cut-off voltages are 4.2V and 2.5V respectively; do not exceed these limits.
Q6: How should I store the 10-pack?
A: Store in a cool, dry place at approximately 40%–60% state of charge, using insulating protective cases to prevent short circuits. Long-term storage temperature recommended at 0°C ~ 25°C.
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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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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