2Pack Samsung 40T 21700 Cells - 4000mAh 35A for Power Tools & E-Bike (INR21700-40T)
Description
Unlock the Full Potential of Your High-Drain Devices
Unlock the full potential of your high-drain devices with our 2Pack Samsung 40T 21700 Cells (Model: INR21700-40T). Renowned for its legendary performance in the DIY and power tool community, this 21700 battery delivers a massive 4000mAh capacity while supporting a blistering 35A continuous discharge. Whether you are upgrading your electric bike (E-Bike), building a high-capacity battery pack for power tools, or powering heavy-duty robotics, the Samsung 40T provides consistent, reliable, and safer energy delivery. This listing includes two individual cells (not soldered or pre-assembled), offering you the flexibility to build your own packs or replace worn-out batteries in high-performance devices.
Key Features
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High Discharge Rate (35A Continuous)
Designed for high-power applications. It can handle sudden surges in current demand without overheating or voltage sag, perfect for performance-driven devices. -
High Capacity (4000mAh)
Provides longer runtime between charges compared to standard 21700 cells, keeping your tools and rides running longer. -
Trusted Samsung Quality
Premium-grade INR21700-40T cells. Authentic Samsung manufacturing ensures safety, lifespan, and stable voltage output. -
Flat Top Design
Standard flat top configuration for easy DIY assembly and compatibility with most battery holders and spring-loaded devices. -
2-Pack Value
Supplied as two individual cells, providing flexibility for series or parallel configurations to achieve the voltage or capacity your project requires.
Technical Parameters
| Parameter | Value |
|---|---|
| Brand & Model | Samsung INR21700-40T |
| Battery Type | Lithium-Ion (Li-Ion) |
| Size | 21700 (Diameter 21mm, Height 70mm) |
| Capacity | 4000mAh (Minimum 3900mAh) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V |
| Cut-off Voltage | 2.5V |
| Continuous Discharge Current | 35A |
| Pulse Discharge Current | Up to 60A (depending on temperature) |
| 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) / Scooters / Skateboards
Building or replacing battery packs for high-speed electric rides. -
Power Tools
Retrofitting cordless drills, impact wrenches, angle grinders, and hedge trimmers. -
High-Drain Flashlights
Powering tactical searchlights and high-lumen flashlights. -
DIY Battery Packs
Creating custom 2S, 3S, 4S, or larger battery banks for robotics, drones, or portable power stations. -
High-Performance RC Models
Suitable for 1/8th or 1/10th scale buggies/truggies and drones requiring high current spikes.
FAQ
Q1: Does "2Pack" mean it's a 2S battery pack assembled together?
A: No. "2Pack" 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: Can I use these batteries directly in my E-Bike?
A: Usually, a single 3.6V cell is not enough for an E-Bike (which typically requires 36V, 48V, or 52V). You need to build a battery pack using multiple cells wired in series. For a 48V E-Bike, you typically need 13 cells in series (13S). Always consult with a professional if you are unsure about building a battery pack.
Q3: Does this battery have a protection circuit (PCB/BMS) built-in?
A: No. The Samsung 40T is an unprotected flat-top cell. It relies on the external device or the BMS (Battery Management System) of the pack you build to handle overcharge, over-discharge, and short-circuit protection.
Q4: 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).
Q5: How do I identify positive and negative terminals?
A: The flat top (the side with the Samsung logo and model number on it) 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
Built a 36V pack with multiple 2-packs. 35A per cell, amazing power.
Cells are authentic, IR around 12mOhm. 35A continuous is real. 2 pack price good.
I use these in my Emisar D4SV2, turbo is blinding. 4000mAh enough.
Bought 2-pack 40T for my cordless drill. Massive torque. Each cell 4000mAh 35A. Very happy.
Tested capacity 3920mAh each. 35A discharge holds. 2-pack is great.
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.