Description
The Reliance RS40 is a high-performance lithium-ion 21700 rechargeable battery built for power-intensive applications. With a nominal capacity of 4000mAh and a continuous discharge rating of 70A, it offers exceptional output without sacrificing reliability. Ideal for custom battery packs, power tools, e-mobility devices, and high-drain electronics, the RS40 combines robust build quality with outstanding energy delivery.
Key Features
- High Capacity: 4000mAh for long runtimes in power-hungry applications.
- Extreme Discharge Power: Up to 70A max continuous discharge with temperature monitoring.
- INR Chemistry: Delivers a balance of energy density, safety, and thermal stability.
- Durable Construction: Steel shell with safety vent and internal pressure relief design.
- Trusted for Packs: Ideal for integration into professional battery packs and energy systems.
| Manufacturer: | Reliance |
| Model: | RS40 |
| Size: | 21700 |
| Positive Terminal: | Flat Top |
| Nominal Capacity: | 4000mAh |
| Minimum Capacity: | 3900mAh |
| Continuous Discharge Rating (max): | 70A |
| Nominal Voltage: | 3.6V |
| Maximum Voltage: | 4.2V |
| Discharge cut-off Voltage: | 2.5V |
| Protected: | NO, UNPROTECTED. |
| Standard Charge Current: | 2500mA |
| Cycle Life: | =80% capacity after 500 cycles |
| Operating Temperature: | -20°C to 60°C (Discharge), 0°C to 45°C (Charge) |
| Rechargeable: | Yes |
| Approx. Dimensions: | 21.55mm x 70.3mm |
| Approx. Weight: | 65g |
| Country of Origin: | China |
| Data Specification Sheet: | Reliance RS40 21700 4000mAh 70A Battery Datasheet |
⚠ Important Safety Warnings
Improper handling or misuse of this lithium-ion battery can result in FIRE, EXPLOSION, or THERMAL RUNAWAY, causing personal injury, property damage, or death. Users must read and follow all safety guidelines before purchase and use. Click here to review the full safety guidelines.
- Critical Warning: Never carry loose batteries in your pocket, purse, or bag. Loose batteries can come into contact with metal objects like keys or coins, causing a short circuit, which may result in severe burns, fire, or explosion. Always store or transport batteries in a protective case.
- Intended Use: This battery is designed for integration into protected battery packs with a Battery Management System (BMS) or Protection Circuit Board (PCB). It is not intended for standalone use or for e-cigarettes, vaporizers, or similar devices.
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Thermal Runaway: A chain reaction where heat from a failing battery
causes further overheating, potentially leading to fire or explosion.
- Causes: Overcharging, short circuits, physical damage, or exposure to high temperatures.
- Prevention: Use a smart charger, avoid damage, and store batteries in a cool, dry place.
- Storage & Transport: Always store batteries in protective cases to prevent accidental contact with metal objects. Never store loose batteries in pockets, purses, bags, or near conductive materials.
- Inspection: Do not use if the PVC wrapper, terminal insulator, or casing is damaged, dented, leaking, or bulging. Continued use could result in failure, fire, or explosion.
- Charging: Use a smart charger specifically designed for lithium-ion batteries and ensure the charger's voltage matches the battery's specifications. Never overcharge, over-discharge, or leave unattended while charging.
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Prohibited Activities:
- Do not expose the battery to extreme heat, fire, or liquids.
- Do not short circuit, puncture, crush, or modify the battery.
- Do not charge or discharge beyond the manufacturer’s voltage range.
- Do not dispose of in regular trash—always recycle at approved facilities.
- Emergency Response: If the battery overheats, emits smoke, or swells, move it to a non-flammable surface (e.g., sand or concrete) and stop use immediately. In case of fire, use a Class D fire extinguisher or sand. Do not use water.
Disclaimer
18650Battery.com is not responsible for any damages, injuries, or claims arising from improper use, handling, or failure to follow these safety guidelines. Lithium-ion batteries require strict adherence to all safety protocols. It is the reseller's responsibility to ensure all safety warnings and product guidelines are effectively communicated to customers. Users and resellers assume full responsibility for the safe handling, usage, and distribution of this product.