2Pack Samsung 50S 21700 Battery - 5000mAh 25A High Capacity High Drain (INR21700-50S)
Description
Product Description
Experience the perfect balance of power and endurance with the 2Pcs Samsung 50S 21700 Battery (Model: INR21700-50S). Engineered to bridge the gap between high capacity and high discharge, this 21700 lithium-ion cell delivers an impressive 5000mAh capacity alongside a robust 25A continuous discharge (50A pulse). Whether you are building a high-performance e-bike battery pack, upgrading your power tools, or powering a tactical high-lumen flashlight, the Samsung 50S provides the energy density you need without sacrificing power output. This listing includes two individual cells (not pre-assembled), giving you the flexibility to build custom configurations in series or parallel for your specific project requirements. The 2-pack offers excellent value, providing enough cells for a small battery pack upgrade or replacement of worn-out cells in your existing devices.
Key Features
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High Capacity + High Drain (5000mAh + 25A): Offers the perfect balance. Enjoy 5000mAh of runtime with 25A continuous discharge, making it ideal for devices that need both long runtime and sustained power.
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Robust 25A Continuous Discharge: Delivers consistent, stable power under heavy loads without significant voltage sag or overheating. Supports up to 50A pulse discharge for short bursts of high demand.
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Massive 5000mAh Capacity: Provides 25% more capacity than standard high-drain cells (like the 40T), significantly extending your device's runtime between charges.
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Authentic Samsung Quality: Premium-grade INR21700-50S cells with excellent cycle life, safety certifications, and reliable voltage stability.
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Flat Top Design: Standard flat top configuration, compatible with most battery holders, spring-loaded contacts, and DIY battery pack builds.
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2-Piece Value Pack: Supplied as two individual cells, allowing you to replace worn-out cells in pairs, build a 1S2P (parallel), 2S1P (series), or other custom configurations to achieve your desired voltage and capacity.
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Versatile Performance: Suitable for both high-drain applications (power tools, e-bikes) and long-run applications (flashlights, portable stations).
Technical Parameters
| Parameter | Value |
|---|---|
| Brand & Model | Samsung INR21700-50S |
| Battery Type | Lithium-Ion (Li-Ion) |
| Size | 21700 (Diameter 21mm, Height 70mm) |
| Capacity | 5000mAh (Minimum 4900mAh) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Cut-off Voltage | 2.5V |
| Continuous Discharge Current | 25A |
| Pulse Discharge Current | Up to 50A (not for continuous use) |
| Positive Terminal | Flat Top |
| Protection Circuit | No (Unprotected Flat Top Cell) |
| Quantity in Package | 2 Pcs |
Applications
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Electric Bikes (E-Bikes) / E-Scooters / E-Skateboards: Building high-performance battery packs that balance acceleration with long range. Two cells can serve as a starter pack or replacement for worn-out cells in an existing pack.
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Power Tools: Upgrading cordless drills, impact wrenches, angle grinders, and saws for both heavy-duty work and extended run time. Perfect for replacing old cells in a 2-cell tool battery.
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High-Power Flashlights: Powering high-lumen tactical flashlights, searchlights, and headlamps with sustained brightness. Many tactical flashlights use two 21700 cells in series for higher voltage.
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DIY Battery Packs: Creating custom 1S2P, 2S1P, or 2S2P battery banks for robotics, drones, or portable power stations.
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High-Performance RC Models: Suitable for 1/8th or 1/10th scale buggies/truggies and drones requiring high current spikes.
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Portable Power Stations: Building compact yet powerful battery banks for camping, emergency power, or off-grid applications.
FAQ
Q1: Does '2Pcs' mean it's a 2S battery pack assembled together?
A: No. "2Pcs" means you will receive two separate individual cells. You will need to assemble them in series, parallel, or a specific configuration based on your device's requirements.
Q2: What is the difference between Samsung 50S, 50E, and 40T?
A: The 50S is the balanced choice. It has the same 5000mAh capacity as the 50E but with a much higher 25A continuous discharge (vs 9.8A on 50E). Compared to the 40T, it has 1000mAh more capacity but slightly lower continuous discharge (25A vs 35A). Choose 50S if you need both long runtime and good power output.
| Model | Capacity | Continuous Discharge | Best For |
|---|---|---|---|
| 40T | 4000mAh | 35A | High power (power tools, heavy e-bikes) |
| 50E | 5000mAh | 9.8A | Long runtime (flashlights, camping) |
| 50S | 5000mAh | 25A | Balanced (e-bikes, medium power tools) |
Q3: Can I use these two cells to build a battery pack for my E-Bike?
A: A single 3.6V cell (or two cells) is not enough for an e-bike (which typically requires 36V, 48V, or 52V). Two cells can be combined in series to create a 7.2V pack, which is suitable for small devices like some flashlights or RC models. For an e-bike, you need many more cells wired in series. Always consult a professional if you are unsure.
Q4: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 50S is an unprotected flat-top cell. It relies on the external device or a BMS (Battery Management System) to handle overcharge, over-discharge, and short-circuit protection.
Q5: What charger should I use?
A: Use a dedicated intelligent Li-Ion charger designed for 3.6V/4.2V cells. Ensure the charger supports the correct voltage for your specific pack setup (e.g., 1S charger for single cells, 2S charger for 2 cells in series, etc.).
Q6: How do I identify positive and negative terminals?
A: The flat top (the side with the Samsung logo and model number) is the Positive (+) terminal. The bottom (the side with the shiny metal casing and a slight indentation) is the Negative (-) terminal.
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
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Security
Samsung 50S 2 pack came in original box. Performance as expected. Buy with confidence.
Direct drive triple LED, needs 25A. 50S delivers. 2 pack so I can hot swap.
High speed fan 15A, 50S runs 10+ hours. 2 pack for multi-day trips.
One cell 5020mAh, other 4980mAh. Still within spec. Great pair.
I always buy pairs for my 2-cell flashlights. 50S is the best 21700 overall.
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.