BAK 21700 50D 5000mAh 3.7V High-Drain Battery – Tabless Technology, 4mΩ Ultra-Low IR, -40°C to 60°C Wide Temperature for High-Power Devices (2pcs)
Description
Product Description:
The BAK 21700 50D is a next-generation high-drain lithium-ion battery engineered with advanced tabless technology. This 2pcs bundle delivers a massive 5000mAh capacity, an ultra-low internal resistance of just 4mΩ, and a wide operating temperature range from -40°C to 60°C. It sets a new standard for 21700 performance, providing explosive power and exceptional reliability even in extreme cold environments.
Unlike traditional cells that use threaded or spiral-welded negative terminals, the BAK 50D features a unique spot-welded negative terminal design. This advanced manufacturing process contributes to its ultra-low resistance and superior performance. With its wide temperature range, it is the ultimate power source for high-power devices, cold-weather flashlights, electric tools, and outdoor equipment.
Key Features:
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BAK 21700 50D Premium Cell: Next-generation high-drain Li-ion battery with advanced tabless technology.
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5000mAh High Capacity: Provides massive energy for extended runtimes.
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Ultra-Low Internal Resistance (4mΩ): Ensures minimal heat generation and maximum power transfer efficiency.
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Wide Operating Temperature (-40°C to 60°C): Delivers reliable performance in extreme cold and hot environments, perfect for northern winters.
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Advanced Tabless Technology: Newer tabless design offers lower internal resistance and better performance compared to traditional spiral-welded cells.
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Unique Spot-Welded Negative Terminal: Features a spot-welded imprint at the negative terminal, a distinct mark of its advanced manufacturing process.
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Standard 21700 Size: Perfectly fits standard 21700 battery compartments (21mm x 70mm).
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Versatile Applications: Ideal for high-power flashlights, electric tools, drones, and outdoor gear.
Product Parameters:
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Brand: BAK
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Model: 50D
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Size: 21700
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Capacity: 5000mAh
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Nominal Voltage: 3.7V
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Full Charge Voltage: 4.2V
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Internal Resistance: Approx. 4mΩ (Tested at low temperature)
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Chemistry: Li-ion (Lithium Ion)
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Operating Temperature: -40°C to 60°C
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Negative Terminal: Spot-welded imprint (Non-threaded/Non-spiral)
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Dimensions: 21mm (Diameter) x 70mm (Height)
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Pack Quantity: 2pcs
Applications:
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High-Power Tactical Flashlights: Powers the brightest flashlights and searchlights with extreme 4mΩ low internal resistance.
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Cold-Weather Outdoor Gear: Ideal for outdoor equipment and power tools used in extreme cold environments.
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High-Performance Drones & RC Hobbies: Provides sustained high-current power for heavy-lift drones and RC vehicles.
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Cordless Power Tools: Delivers high-power output for demanding power tools and electric drills.
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Professional Industrial Equipment: Reliable power for industrial applications requiring high discharge and wide temperature tolerance.
Frequently Asked Questions (FAQ):
Q1: What is the advantage of tabless technology?
A1: Tabless technology eliminates the traditional spiral or threaded connections, resulting in significantly lower internal resistance. For the BAK 50D, this translates to an ultra-low 4mΩ IR, which means less heat generation and more power delivered to your device.
Q2: What is the operating temperature range of this battery?
A2: The BAK 50D has an impressive operating temperature range of -40°C to 60°C. This makes it the ideal choice for devices used in extreme cold environments, such as northern winters or high-altitude operations.
Q3: Is the 5000mAh capacity real?
A3: Yes. The BAK 50D delivers a true 5000mAh capacity, providing reliable, long-lasting energy for high-drain devices.
Q4: How does the negative terminal differ from traditional batteries?
A4: Unlike traditional batteries that use threaded or spiral-welded negative terminals, the BAK 50D features a spot-welded imprint at the negative terminal. This advanced manufacturing technique is a hallmark of its superior engineering.
Q5: 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. Do not use a standard AA/AAA Ni-MH charger.
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
The BAK 50D is now my go-to 21700 cell. Highly recommended.
They outperform every other cell I own in freezing conditions.
I replaced my old cells with these. My unicycle has noticeably more power when climbing hills.
My laser level needs high peak current. These cells provide it without any flickering.
These feel like industrial-grade cells. The build quality is excellent.
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.