10-Pack 21700 Battery 5000mAh 3.6V Flat Top, 30A High Drain High Capacity for Flashlights, Emergency Lights, Devices & Portable Electronics
Description
Key Features
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30A Continuous High Drain – Sustains high current output for demanding devices without overheating or significant voltage drop.
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5000mAh Genuine Capacity – Provides extended runtime, ideal for long-lasting flashlights, emergency lights, and portable power needs.
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Flat Top Design – Low-resistance contact surface ensures compatibility with a wide range of 21700 hosts, from flashlights to battery packs.
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Ultra-Low Internal Resistance (≈12–15mΩ) – Maximizes efficiency, reduces waste heat, and maintains stable voltage under heavy loads.
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High Capacity + High Drain Combined – No need to choose between endurance and power; one cell covers both low-drain long-run and high-drain burst applications.
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10-Pack Bulk Value – Economical multi-pack for powering multiple devices, building DIY battery packs, or keeping a full rotation of spares.
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A-Grade Cells – Every battery is inspected, tested, and capacity-matched to ensure consistent performance and safety.
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Long Cycle Life – ≥500 charge-discharge cycles while retaining over 70% of original capacity, reducing total ownership cost.
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Built-in Safety Features – Pressure relief vent and current interrupt device (CID) provide critical protection under fault conditions.
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Versatile Use – Perfect for flashlights, headlamps, emergency lights, portable fans, and many other electronics.
Parameters
| Parameter | Specification |
|---|---|
| Model | 21700 Flat Top Li-ion (Unprotected) |
| Nominal Capacity | 5000mAh (tested at 0.2C) |
| Nominal Voltage | 3.6V |
| Full Charge Voltage | 4.2V ±0.05V |
| Discharge Cut-off Voltage | 2.5V |
| Max Continuous Discharge | 30A |
| Max Pulse Discharge (<5s) | 40A |
| Internal Resistance | Approx. |
| 12–15mΩ (AC 1kHz) | Chemistry | INR / NMC High Drain | Protection Circuit | None (unprotected flat top) | Dimensions | 21.0mm × 70.0mm | Weight | Approx. |
| 68g per cell | Cycle Life | ≥500 cycles to 70% capacity | Operating Temperature | Charge 0°C~45°C / Discharge -20°C~60°C | Recommended Charging Current | Standard 1.5A, Rapid 4A (with temperature monitoring) |
Applications
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High-Lumen Flashlights & Tactical Torches – Drives turbo modes up to 30A with minimal sag, perfect for search, rescue, and EDC lights.
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Emergency Lights & Camping Lanterns – 5000mAh ensures all-night illumination during power outages or outdoor trips.
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Headlamps & Helmet Lights – Combines high brightness and long runtime for caving, cycling, and professional use.
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Portable Electronics & DIY Projects – Ideal for powering USB chargers, portable fans, Bluetooth speakers, smart door locks, and sensor nodes.
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DIY Battery Packs – Perfect for rebuilding cordless tool packs, small e-bike batteries, or solar power banks where both capacity and current matter.
FAQ
Q1: Do these batteries have a protection circuit?
A: No. They are unprotected flat-top cells, designed to offer the lowest possible internal resistance for high-drain applications. Always use them in devices with built-in over-discharge and over-current protection, or install an external protection PCB. Never short circuit.
Q2: Is the capacity really 5000mAh?
A: Yes. Capacity is verified by 0.2C standard discharge. Under high current (e.g., 20A), usable capacity may be around 4700–4900mAh due to internal resistance losses, which is normal.
Q3: Will they fit my LED flashlight?
A: If your flashlight accepts unprotected flat-top 21700 cells, yes. Verify that the positive contact can reach a flat terminal. Some flashlights designed only for button-top cells may require a magnet spacer (use with extreme care and at your own risk).
Q4: What charger do I need
A: A dedicated Li-ion charger that supports 3.6V/3.7V cells, 21700 size, with CC/CV profile and 4.2V cutoff. Recommended brands: Xtar, Nitecore, Vapcell, or Gyrfalcon. Never use NiMH chargers.
Q5: Can I mix these with old batteries in a multi-cell device?
A: Absolutely not. Always use identical cells of the same model, age, and charge status when running in series or parallel. Mixing mismatched cells can cause imbalance, overheating, or even fire.
Q6: How should I store these batteries?
A: Store at 3.6–3.7V (around 40–60% charge) in a cool, dry place. Avoid high temperatures. Check voltage every 3 months and recharge to storage voltage if needed.
Q7: Are the 10 cells in the pack matched?
A: Yes. The 10-pack consists of A-grade cells that are capacity-matched and internal-resistance-checked, making them suitable for use as a set in multi-cell applications.
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
5000mAh true capacity, tested all 10 cells, they ranged from 4980mAh to 5050mAh. IR consistent. 30A is perfect for my emergency lantern bank.
Most cells were over 5000mAh, but one gave only 4860mAh. Still overall great for the price. 30A rating holds.
Replaced old battery pack in my drill, 10 of these in series/parallel. Torque is great, runtime improved. Highly recommended.
Single 21700 mod at 80W, these 30A cells handle it easily and last all day. 5000mAh lasts longer than my old 4000mAh cells.
Used to build a 2S5P pack for my drone ground station. 150A capable, runs for hours. These 21700s are top notch.
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.