4Pcs Reliance RS50 21700 5000mAh 70A Battery – -40℃ Low Temp Tabless High Drain Cell for Drone, Power Tools & E-Scooter
Description
Description
Defy the cold with the Reliance RS50, a revolutionary 21700 cell that combines tabless high-drain technology with extreme low-temperature capability down to -40℃. This 4-pack delivers a massive 5000mAh capacity, a continuous 70A discharge, and a 120A pulse rating, making it the ultimate all-weather power solution for drones, heavy-duty power tools, e-scooters, and cold-climate operations. The ultra-low internal resistance of approximately 5mΩ ensures minimal voltage sag and rapid power delivery even in sub-zero conditions where conventional batteries fail. The flat top design fits all standard 21700 devices and simplifies spot-welding for custom battery packs. When your mission cannot be stopped by winter, the Reliance RS50 is your unstoppable power source.
Key Features
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-40℃ Extreme Low Temperature Capability – Engineered with advanced low-temperature electrolyte, the RS50 discharges reliably at -40℃ where standard lithium cells completely fail. Perfect for polar expeditions, high-altitude drones, and winter outdoor work.
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70A Continuous / 120A Pulse Discharge – Delivers massive current for the most demanding applications. Handles power tool start-ups, e-scooter acceleration, and drone punch-outs with ease, even in freezing temperatures.
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5000mAh High Capacity – Industry-leading energy density for a high-drain low-temp cell. Enjoy extended runtime and flight time compared to standard 4000mAh cells.
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Tabless (All-Tab) Technology – Reduces internal resistance to ~5mΩ. Minimizes heat generation, maximizes power delivery, and maintains voltage stability under extreme loads.
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Flat Top Design – Universally compatible with 21700 spring-contact chargers, battery trays, and flashlights. Ideal for spot-welding nickel strips in custom battery packs.
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4-Pack Convenience – Perfect for building a cold-weather drone pack, equipping winter tools, or powering a compact e-scooter battery module.
Parameters
| Parameter | Specification |
|---|---|
| Model | Reliance RS50 (21700) |
| Technology | Tabless (All-Tab) + Low-Temperature Electrolyte |
| Typical Capacity | 5000 mAh (0.2C discharge to 2.5V at 25°C) |
| Minimum Capacity | ~4800 mAh |
| Nominal Voltage | 3.6 V (typical operating 3.7 V) |
| Max Continuous Discharge | 70 A (at 25°C; derate to ~40A for prolonged -40℃ use) |
| Max Pulse Discharge | 120 A (short burst <5 sec, monitor temperature) |
| Low-Temperature Discharge | -40℃ operable (capacity and voltage may be reduced; typical 60-70% capacity retention at -40℃) |
| Discharge Cut-off Voltage | 2.5 V (do not over-discharge) |
| Standard Charge | CC-CV, 0.5C (2500 mA) to 4.2 V, cut-off 50 mA |
| Max Charge Current | 1C (5000 mA) at 10-45°C |
| Critical Charging Note | Charge only above 0°C. Charging below freezing causes permanent damage. |
| Internal Resistance | ≤ 8 mΩ (typical ~5 mΩ, AC 1 kHz at 25°C) |
| Cycle Life | ≥ 500 cycles (to 80% capacity, 0.5C charge / 1C discharge at 25°C) |
| Operating Temperature (Discharge) | -40°C to 60°C (ensure active cooling for sustained 70A at room temp) |
| Storage Temperature | -20°C to 25°C recommended; store at 3.6-3.7V for long-term |
| Top Type | Flat Top |
| Dimensions | Approx. 21.2 mm diameter × 70.3 mm length |
| Weight (single cell) | Approx. 69 g |
| Package Includes | 4 × Reliance RS50 21700 cells in protective packaging |
Applications
Recommended For
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Polar & High-Altitude Drones / FPV: Maintain stable flight power at -40℃ where standard LiPo and Li-ion packs fail. 5000mAh extends mission duration in cold weather surveillance and research.
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Cold-Climate Power Tools: Angle grinders, impact wrenches, and drills used in winter construction, mountain rescue, or arctic fieldwork operate without battery failure.
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Winter E-Scooters & Snow Vehicles: Overcome the severe range loss that conventional batteries suffer in freezing temperatures.
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Polar Research & Cold-Region Monitoring: Unattended weather stations, wildlife cameras, and scientific instruments that must operate reliably through extreme winters.
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Winter Search & Rescue Lights: High-output flashlights and searchlights that cannot afford battery failure during critical mountain rescue operations.
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Cold Storage & Cold Chain Logistics: Handheld terminals, scanners, and equipment used in -18℃ to -40℃ freezer environments.
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Competition Vaping & RC Racing (Cold Weather): Maintain peak power delivery during outdoor winter competitions and training sessions.
Not Recommended For
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Indoor Low-Power Devices (room temperature): The extreme low-temp capability is unnecessary and adds cost. Use a standard high-capacity cell like the Samsung 50G.
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Standard USB Power Banks: Severe performance overkill.
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18650-Only Devices: This is a 21700 cell and will not physically fit.
FAQ
Q: Can this battery really work at -40℃? How does the performance compare to room temperature?
A: Yes. The RS50 is specifically engineered with a low-temperature electrolyte that enables discharge at -40℃. At this extreme temperature, you can expect approximately 60-70% of the room temperature capacity and a slightly lower voltage under load. For best results at -40℃, we recommend limiting continuous current to around 40A to maximize runtime and minimize voltage sag.
Q: Can I charge this battery in freezing temperatures?
A: No. Never charge a lithium-ion battery below 0℃. The RS50 can discharge at -40℃, but charging must always be done above 0℃ (ideally 10-25℃). Charging below freezing causes irreversible lithium plating, permanently damaging the cell and creating a safety hazard. If the battery has been used in the cold, allow it to warm up to room temperature before charging.
Q: How does the RS50 compare to standard high-drain 21700 cells?
A: The RS50 matches or exceeds the performance of top-tier tabless cells like the EVE 40PL or Ampace JP40 in terms of current delivery (70A continuous, 120A pulse) and capacity (5000mAh), while adding the unique -40℃ low-temperature capability that no standard cell can match. It is essentially a premium all-weather upgrade.
Q: Is this battery suitable for my FPV drone?
A: Absolutely. For winter FPV flying or high-altitude missions, the RS50 is a game-changer. It provides the high burst current needed for punch-outs and acrobatics, the 5000mAh capacity for extended flight time, and reliable operation in freezing conditions that would ground standard packs.
Q: Do I need a special charger?
A: No special charger is required. Use any quality CC-CV lithium-ion charger compatible with 21700 cells. The critical rule is to always ensure the battery temperature is above 0℃ before initiating a charge cycle.
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
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.