Reliance 21700 RS40 Battery 4000mah 70A Discharge Rate Lithium Ion 3.6v Cylindrical Cell

21700 RS40

21700 RS40 is a 4000mah 70A maximum discharge rechargeable lithium battery with a 1-year warranty.

Weighing only 67.0g , it is suitable for various applications such as toys, power tools, AGV, two-wheel electric vehicles, electric scooters, etc.

The battery is manufactured by Samsung a well-known lithium battery manufacturer, meeting international quality and safety standards.

Can be customized according to customer needs, including PCB, wires and connectors.

Quantity

Contact Now

add to cart

Overview

Product Description

Product Features:

High rate: maximum 70A discharge.

Compact size: 21.35*70.30mm, light weight, only 67g.

Wide range of uses: suitable for power tools, AGV, two-wheel electric vehicles, electric scooters and other products.

Flexible warranty: The warranty period is 1 year, giving you peace of mind.

Rechargeable:Lithium-ion technology ensures long-term availability.

Customizable:Supports custom assembly, providing PCB, wire and connector options.

International compliance: 3C, RoHS, UN38.3 and other certifications ensure safety and quality.

Applications:

21700 RS40 battery cells are used in various fields due to their versatility and reliability.

Its main applications include:

Toys:Power electronic toys and gadgets to extend playtime.

Power tools: Provide energy for a variety of cordless power tools for efficient operation.

Consumer electronics: Support a variety of portable electronic devices, ensuring long service life and stable performance.

These applications prove the adaptability and reliability of 21700 RS40 battery cells in different industries, making it a versatile choice for many electronic and transportation equipment.

The21700 RS40 4000mAh Battery is a cutting-edge cylindrical lithium-ion cell developed by RUIEN to deliver exceptional performance in power-hungry devices. Designed for extreme output and runtime, the 21700 RS40 4000mAh Battery offers a massive 70A continuous discharge rate, making it ideal for high-drain applications like drones, power tools, and tactical Flashlights Battery systems requiring both endurance and intense bursts of power. It also provides reliable support in modular Energy Storage Battery systems, where long service life and stable output are critical.

With a nominal voltage of 3.6V and a capacity of 4000mAh, the 21700 RS40 4000mAh Battery balances energy density and discharge capability better than most batteries in its class. Whether installed in a heavy-duty Flashlights Battery setup or integrated into a compact Energy Storage Battery array for off-grid or mobile applications, this battery delivers unmatched stability, making it a go-to choice for engineers and outdoor users alike.

Engineered for rugged performance, the 21700 RS40 4000mAh Battery is well-suited to tactical lights, drone propulsion, portable fans, and professional-grade communication tools. Its low internal resistance and fast voltage recovery under high current make it ideal for responsive Flashlights Battery applications, as well as efficient charge-discharge cycles in Energy Storage Battery modules that demand consistent throughput and safety.

The cell’s cylindrical format offers easy integration into multi-cell assemblies, allowing designers to build scalable Energy Storage Battery banks or high-powered Flashlights Battery packs. The 21700 RS40 4000mAh Battery provides excellent thermal management, essential when pushing the 70A discharge rating in continuous-use tools or high-speed drone motors.

As a high-performance Flashlights Battery, the RS40 offers stable lumen output, allowing tactical and rescue lights to maintain brightness levels without sagging voltage. In the same way, the 21700 RS40 4000mAh Battery delivers high peak power to tools like cordless grinders, air blowers, and fascia guns. These high-power characteristics also enhance Energy Storage Battery performance in portable backup stations and off-grid lighting setups.

In energy storage applications, the 21700 RS40 4000mAh Battery supports reliable daily cycling, making it a top choice for mobile solar stations, camping power kits, and field communications gear. This battery is frequently used in custom Flashlights Battery builds where long runtime, fast recharge, and strong voltage stability are required. At the same time, the RS40 meets the thermal and electrical demands of larger Energy Storage Battery systems, particularly in compact or weight-sensitive builds.

The21700 RS40 4000mAh Battery also enables portable cooling and ventilation devices like USB fans and airflow tools to run longer and stronger. As a Flashlights Battery, it keeps high-lumen lights operational through the night, while as an Energy Storage Battery, it ensures clean, stable backup power for off-grid conditions or mobile infrastructure.

In conclusion, the 21700 RS40 4000mAh Battery from RUIEN is a professional-grade power cell built for performance, endurance, and safety. Whether it’s used as a Flashlights Battery for demanding environments or an Energy Storage Battery for remote, solar, or portable systems, it delivers industry-leading reliability, all while maintaining compact size and maximum output.

About us:

Shenzhen Genju Technology Co., Ltd. has 16 years of experience in the lithium battery industry and is a high-tech enterprise integrating R&D, production and sales.

Specializing in the R&D and production of high-quality lithium-ion batteries, it has its own R&D brand SAFD and professional low-temperature lithium battery brand WORWORF.

The company has close cooperative relations with many universities and scientific research institutions, and has signed industry-university-research cooperation agreements with Central South University and Hunan University.

We will take the creation of safer, more stable and more cost-effective lithium battery products as the standard, and provide targeted R&D and private customization services according to the needs of different customers.

With excellent quality, stable supply and thoughtful service, we have strong competitiveness and stand out in the fierce market competition. We have established long-term and stable cooperative relations with many large enterprises and hope to become your partner.

Product range we provide:

We provide a wide range of products, including 18650 batteries, 21700 batteries, lithium iron phosphate cylindrical batteries, lithium primary batteries and OEM/ODM batteries. Our battery pack voltage ranges from 12V to 80V, and the capacity ranges from 7AH to 100AH. It can be customized according to customer needs.

Application:

Our batteries are used in smart two-wheel travel, power tools, smart homes, smart robots, drones, portable energy storage, medical equipment, industrial equipment and other fields. Whatever your needs for battery packs, our batteries can meet and exceed your expectations.

About Us：

1.Experience Genju has 16 years of experience in the battery industry.

2.Main Over the past 16 years, we have cooperated with hundreds of enterprises at home and abroad. We are recognized by most of our peers and customers.

3.Quality We strictly implement each inspection step, including appearance/short circuit quality inspection, electrical inspection, liability testing, etc. To ensure the quality of the product you receive, our batteries have passed UN38.3 certification, IEC62133 certification, MSDS certification, and CE certification. And do final inspection before shipment.

4.After-sales service We provide one year warranty. Our well-trained engineers and staff will respond to your product within 12 hours and help you solve any product problems patiently and sincerely.

5.OEM & ODM Any details (size, material, etc.) can be customized or changed according to your unique requirements.

FAQ：

1. Is the product original?

Yes, 100% original battery. We have been in the lithium battery industry for 16 years and never sell counterfeit batteries. We know that reputation is the way for a company to last long.
We support you to buy samples for testing. No matter how much we say, it is not as accurate as your own test.

2. Is there a minimum order quantity?

There is no limit, but the more quantity, the better the price. Welcome to consult the best price.

3. What products do we mainly sell?

18650, 21700, lifepo4 cylindrical battery, CR123A, lithium battery pack.
Tips: Due to the large number of products in the store, if you want to find the product you need quickly, you can contact us directly and send the product model you want.
Or send the product data you need, we can recommend suitable products for your reference.

4. How long is the delivery time?

Usually 2-5 days (because final inspection is required before delivery). We will arrange delivery for you as soon as possible.

5. Delivery terms

Accepted delivery terms: FOB, CIF, EXW, CIP, DDP;

6. If you are interested in our products, have any suggestions or needs, please contact us.