Reliance RS50 21700 5000mAh 70A High-Discharge Li-ion Battery
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The Reliance INR21700-RS50 is a high-performance rechargeable lithium-ion cell designed for applications requiring both high energy capacity and exceptional current delivery.
Featuring a 5000mAh typical capacity, 4950mAh minimum capacity, and a manufacturer-specified 70A maximum continuous discharge current with an 80°C temperature cutoff, the RS50 combines high energy density with impressive high-current performance in a standard 21700 format.
With low internal resistance and a compact flat-top design, the Reliance RS50 is suitable for compatible high-output flashlights, power tools, and professionally engineered battery systems.
Important: This is an unprotected flat-top 21700 lithium-ion cell without a built-in protection PCB/BMS.
5000mAh High Capacity
The Reliance RS50 delivers a typical capacity of 5000mAh and a minimum standard discharge capacity of 4950mAh.
With a nominal voltage of 3.6V, it provides approximately 18Wh of nominal energy, offering substantial energy storage for demanding applications.
The RS50 is designed to balance battery capacity with high-current performance, making it an attractive option for compatible equipment requiring both power and runtime.
Actual operating time depends on device power consumption, discharge current, temperature, and operating conditions.
70A Maximum Continuous Discharge with Thermal Cutoff
One of the key features of the Reliance RS50 is its manufacturer-specified maximum continuous discharge current of 70A, subject to an 80°C cell-temperature cutoff.
This high-current capability makes the RS50 suitable for demanding power applications where substantial current delivery is required.
Discharge Specifications
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Maximum Continuous Discharge Current: 70A
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Temperature Cutoff at 70A: 80°C
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Standard Discharge Current: 1A
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Discharge Cutoff Voltage: 2.50V
Important: The 70A specification includes an 80°C thermal cutoff. It does not guarantee that the battery can sustain 70A indefinitely or without appropriate temperature monitoring and cooling.
Actual sustained performance depends on cell temperature, cooling conditions, equipment design, and electrical load.
Low Internal Resistance
The Reliance RS50 features an initial AC internal resistance of 4.0mΩ or less, measured at 1kHz under manufacturer-specified conditions.
Low internal resistance helps reduce voltage drop under heavy loads and supports efficient high-current power delivery.
This makes the RS50 particularly suitable for compatible high-drain devices where electrical performance is important.
High-Rate Discharge Performance
The Reliance RS50 is designed to maintain useful discharge capacity across a wide range of current levels.
Its high-rate discharge characteristics make it suitable for applications requiring substantial power output.
As discharge current increases, available capacity and operating time may decrease due to voltage sag, heat generation, and temperature-related cutoff conditions.
For reliable operation, always use the cell within the manufacturer's specified voltage, current, and temperature limits.
Fast-Charging Capability
The RS50 supports constant-current/constant-voltage (CC/CV) lithium-ion charging.
According to the manufacturer's specifications:
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Standard Charging Current: 2.5A
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Rate Charging Current: 8A
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Maximum Continuous Charging Current: 15A
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End-of-Charge Voltage: 4.20V
Higher charging currents require suitable charging equipment, appropriate temperature control, and compliance with the manufacturer's specified conditions.
For everyday charging, the standard 2.5A charging current is a practical reference.
Unprotected Flat-Top Design
The Reliance INR21700-RS50 is an unprotected flat-top lithium-ion cell.
It does not include a built-in electronic protection PCB or BMS.
The battery must be used only in compatible equipment with appropriate voltage, current, and temperature protection.
Before purchasing, confirm that your device supports:
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21700 lithium-ion batteries
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Flat-top positive terminals
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Unprotected battery cells
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3.6V nominal lithium-ion voltage
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The cell's physical dimensions
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The battery's electrical and discharge characteristics
Not all flashlights designed for 21700 batteries are compatible with unprotected flat-top cells.
Compact 21700 Battery Format
The RS50 uses a cylindrical 21700 design, providing substantial capacity and high-current capability in a compact format.
According to the A1-3 manufacturer specification:
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Maximum Diameter: 21.25mm
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Maximum Height: 70.35mm
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Maximum Weight: 67g
Please check the battery compartment dimensions before purchasing.
Key Features
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5000mAh typical capacity
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4950mAh minimum capacity
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3.6V nominal voltage
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Approximately 18Wh nominal energy
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70A maximum continuous discharge with 80°C temperature cutoff
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Low AC internal resistance of ≤4.0mΩ
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Standard 2.5A charging current
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8A rate-charging capability
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Maximum continuous charging current of 15A under specified conditions
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Flat-top positive terminal
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Unprotected design without PCB/BMS
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Standard 21700 cylindrical format
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Designed for compatible high-drain applications
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Reliance |
| Manufacturer | Jiangsu Reliance Energy Tech. Co., Ltd. |
| Model | INR21700-RS50 |
| Battery Chemistry | Rechargeable Lithium-Ion |
| Battery Size | 21700 |
| Typical Capacity | 5000mAh |
| Minimum Capacity | 4950mAh |
| Nominal Voltage | 3.6V |
| Nominal Energy | Approx. 18Wh |
| End-of-Charge Voltage | 4.20V |
| Discharge Cutoff Voltage | 2.50V |
| Standard Charging Current | 2.5A |
| Rate Charging Current | 8A |
| Maximum Continuous Charging Current | 15A |
| Standard Discharge Current | 1A |
| Maximum Continuous Discharge Current | 70A, with 80°C temperature cutoff |
| AC Internal Resistance | ≤4.0mΩ (1kHz) |
| Maximum Diameter | 21.25mm |
| Maximum Height | 70.35mm |
| Maximum Weight | 67g |
| Ambient Charging Temperature | -20°C to 45°C |
| Ambient Discharging Temperature | -40°C to 60°C |
| Positive Terminal | Flat Top |
| Protection Circuit | No – Unprotected |
Technical specifications are based on the Reliance INR21700-RS50 A1-3 manufacturer specification. Actual performance depends on charging conditions, discharge current, cell temperature, and device compatibility.
Important Battery Safety Information
WARNING: UNPROTECTED HIGH-DISCHARGE LITHIUM-ION CELL
The Reliance RS50 does not include a built-in electronic protection circuit. Improper handling, charging, or operation may cause overheating, fire, or serious injury.
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Use only in equipment specifically compatible with unprotected 21700 lithium-ion cells.
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Ensure the device or battery system provides appropriate overcharge, over-discharge, overcurrent, and temperature protection.
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Use a suitable lithium-ion charger with CC/CV charging control.
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Never short-circuit the positive and negative terminals.
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Do not exceed the manufacturer's voltage, current, or temperature limits.
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Never use damaged, dented, leaking, or improperly insulated cells.
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Do not carry loose batteries with coins, keys, or other conductive objects.
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Store and transport individual cells in protective battery cases.
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Do not mix different battery models, ages, or charge levels in multi-cell devices.
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Battery pack assembly should be performed only by qualified personnel using appropriate protection circuitry.
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Keep batteries away from children.
Package Contents
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1 × Reliance INR21700-RS50 5000mAh Unprotected Li-ion Battery
Charger and accessories are not included unless otherwise specified.
High Capacity Meets High-Current Performance
The Reliance RS50 21700 5000mAh Battery combines substantial energy capacity, low internal resistance, and manufacturer-specified high-current discharge capability.
With a 70A maximum continuous discharge rating subject to an 80°C temperature cutoff, it is designed for compatible high-performance flashlights and other demanding power applications.
Please verify device compatibility before ordering. This is an unprotected flat-top lithium-ion cell without a built-in PCB
SHIPPING
The final shipping cost and estimated delivery timeframe will be available to you during checkout. Currently, we offer 3 International shipping methods which are steady and easy to track. Priority worldwide shipping, Premium ( Partial countries) and a faster Express shipping. The estimated times stated below are not guaranteed. An international package could experience delays like postal strikes or severe weather or Cov-19 situation. All shipping ways, PO Box address is not acceptable.
For some flashlights, there's a pure battery inside（phone charging）,If We can not ship your packages via USPS or DHL,we'll ship your package in another way.
Note:
When you place an order for just the batteries, for easy shipping, faster and safe delivery, the batteries are placed in the flashlights.
If you don’t receive your order within the estimated time frame provided below and suspect that it might be lost in transit, please contact Flashlightgo Support ( support@flashlightgo.com ) and we can look into the order with the courier. Lost-in-transit requests must be submitted to Flashlightgo Support within 3 months of the date of shipping or before the courier archives the tracking information.
Option 1.
Express by DHL/UPS/Fedex/Aramax/SF etc ( there may be tax need to pay in this way),
The estimated time of delivery is usually 3-7 work days depending on the country. Includes detailed tracking and confirmation of delivery.
Option 2.
Premium ( 6-10days, All tax and Duty Paid),
All tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.
Option 3.
Priority shipping(1-2 Weeks, average 10 days)
If we marked it is with all tax and duty paid, all tax and duty are prepaid to carrier by Flashlightgo before shipping, so you dont need to pay any tax or duty when you get it.
Learn more,Please click on Here.
To ensure that you get the desirable product, we allow a seven-day product return period. Any product return application outside this period will not be entertained.
All returned product must be unused and the original package should be kept.
Return：
We do not offer return for personal products like socks and hats or food, magazine and fragile or dangerous products The original receipt must be available for application of return.
Discount products：
No product return for discount products
Gifts products：
If the item is marked as a gift when purchased and shipped directly to you, it cannot be exchanged , refunded or warranty.
Exchange：
We only replace items if they are defective or damaged.
Exchange service are offered only to wrong deliveries or product damage not caused by client. If needed, please email to info@flashlightgo.com.
Warranty
How long is the warranty period?
Flashlightgo warrants to the original purchaser that the Product(s) shall be free of any defect in material or workmanship for a period of one year for labor and one year for parts from the date of the original order except the items listed below:
Chargers,Batteries and Other Accessories: 3 months warranty
Should the Product(s) supplied by Flashlightgo prove defective because of improper workmanship or material as reasonably determined by us, Flashlightgo agrees, at its option, to either repair or replace the Product free of charge, excluding any shipping or handling charges.
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