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The Golden Balance of High Capacity and Reliable Power. The LiitoKala Lii-50E is a premium 21700 rechargeable Li-ion battery that delivers a massive 5000mAh capacity with a stable 10A continuous discharge and an astonishing 1000 cycle life. This makes it the ultimate power source for high-lumen flashlights, power banks, medical devices, electric vehicles, and DIY battery pack projects.
Available in two distinct terminal versions to perfectly match your device's requirements:
Flat Top (70.9mm): Standard flat positive terminal for modern devices, DIY packs, and e-bikes.
Button Top (72mm): Raised positive terminal for older equipment with spring-loaded contacts. (Adds ~1mm length)
( IMPORTANT: Please carefully measure your device's battery bay depth before purchasing. The Button Top version is slightly longer than the standard Flat Top!)
Massive 5000mAh Capacity: One of the highest capacities in the 21700 format, delivering extended runtimes for your most demanding devices.
Stable 10A Continuous Discharge: Provides reliable power for high-drain devices without excessive voltage sag.
Ultra-Long 1000 Cycle Life: Withstands over 1000 charge/discharge cycles with only 50% capacity degradation, providing unmatched long-term value.
Low Internal Resistance (≤20mΩ): Ensures high efficiency, minimal heat generation, and stable voltage under load.
Two Terminal Options: Available in Flat Top and Button Top to suit any device or build.
Wide Operating Temperature: Functions safely from -20°C to 60°C, making it ideal for outdoor gear and emergency equipment.
Versatile Applications: Perfect for flashlights, power banks, medical instruments, electric vehicles, robotics, and DIY battery packs.
Brand: LiitoKala
Model: Lii-50E
Battery Size: 21700
Nominal Capacity: 5000mAh (Minimum 4800mAh)
Nominal Voltage: 3.7V
Full Charge Voltage: 4.2V
Discharge Cut-off Voltage: 2.75V
Max Continuous Discharge Current: 10A (2C)
Max Charge Current: 10A (2C)
Internal Resistance: ≤20mΩ
Cycle Life: 1000 cycles (50% capacity retention)
Operating Temperature: -20°C to 60°C
Storage Temperature: -30°C to 60°C (Less than 1 year)
Terminal Options: Flat Top (70.9mm) / Button Top (72mm)
Dimensions: 21.7mm (Dia) × 70.9mm / 72mm (Height)
Weight: Approx. 67-70g
High-Lumen Flashlights: Powers tactical and everyday carry flashlights.
Power Banks: Build high-capacity power banks for charging phones and tablets.
Medical Devices: Reliable power for portable medical equipment.
Electric Vehicles (EVs): Suitable for light e-bikes, e-scooters, and electric skateboards.
DIY Battery Packs: Ideal for custom 1S/2S/3S packs for robotics, drones, and power stations.
Q1: What is the difference between the two terminal options?
A1: Flat Top is 70.9mm and fits most modern devices. Button Top is 72mm and is for older spring-loaded devices (adds ~1mm). Please measure your device before ordering!
Q2: What is the continuous discharge rating?
A2: The official continuous discharge rating is 10A (2C). This is perfect for high-drain devices like high-lumen flashlights and power tools.
Q3: How many cycles can I expect?
A3: The Lii-50E is rated for 1000 charge/discharge cycles, retaining 50% of its original capacity, which is significantly longer than standard 21700 cells.
Q4: Can I use this battery in extreme temperatures?
A4: Yes! It operates safely from -20°C to 60°C, making it suitable for outdoor gear and emergency equipment.
Q5: Does this battery have a protection circuit?
A5: No, both versions are unprotected cells. Your device or a separate BMS (Battery Management System) should handle overcharge, over-discharge, and short-circuit protection.
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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