Samsung 21700 40T 3.6V 4000mah Cylindrical Rechargeable Lithium Battery

Samsung 21700 40T

Samsung 21700 40T is a 4000mah 45A maximum discharge rechargeable lithium battery with a 1-year warranty.

Weighing only 70g , 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, and is 3C certified, meeting international quality and safety standards.

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

Quantity

Contact Now

add to cart

Alibaba purchase link：Samsung 21700 40T BATTERY

Overview

Product Description

Product Features:

High rate: maximum 45A discharge.

Compact size: 21*70mm, light weight, only 70g.

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:

Samsung 21700 40T 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 Samsung 21700 40T battery cells in different industries, making it a versatile choice for many electronic and transportation equipment.

The21700 4000mAh battery from Samsung, model 21700-40T, is an advanced High rate battery designed to meet the intense power demands of professional and industrial-grade applications. Engineered with a nominal capacity of 4000mAh and capable of delivering up to 45A continuous discharge, this 21700 4000mAh battery stands out as one of the most powerful cells in its class. It is widely chosen for high-drain environments such as Power tool battery packs, drones, electric fans, communication devices, tactical flashlights, and mobile energy storage where strong output and endurance are mission-critical.

The21700 4000mAh battery features low internal resistance and robust high-current handling, making it ideal as a High rate battery in demanding power tools and unmanned aerial vehicles. Its exceptional pulse and sustained discharge capabilities ensure consistent performance, while its thermal stability supports safe use in compact and enclosed Power tool batteryhousings.

As a top-tier 21700 4000mAh battery, the Samsung 40T delivers excellent voltage retention under load, supporting applications that require both high current and long runtime. Whether integrated into a cordless drill, high-speed blower, or impact wrench, this High rate battery provides reliable and uninterrupted energy delivery. In a Power tool battery pack, it significantly improves runtime without sacrificing torque or power output.

Each21700 4000mAh battery undergoes Samsung’s rigorous testing and adheres to international safety and quality standards. This ensures that every High rate battery cell operates safely under high-stress cycles. Whether deployed in a heavy-duty Power tool battery configuration or a lightweight drone module, the Samsung 40T maintains cycle life, safety, and thermal control.

The cylindrical form factor of the 21700 4000mAh battery allows for dense, scalable pack assembly. It is a preferred choice among OEMs developing advanced Power tool battery solutions and compact power modules. The high continuous discharge current of this High rate battery allows it to perform flawlessly in fast-reaction systems, including UAV propulsion and robotic powertrains.

From power-hungry grinders to portable ventilators and tactical torches, the 21700 4000mAh battery enhances device reliability and energy delivery. Its capacity and discharge rate allow for hybrid use cases where both duration and intensity matter — the ideal role for a High rate battery. When assembled into a Power tool battery pack, the 40T sustains high current without overheating or sagging voltage.

Additionally, the 21700 4000mAh battery is compatible with advanced BMS platforms that ensure safe charge and discharge operations. This makes it a safe and effective High rate battery choice even in smart Power tool battery systems and outdoor high-drain electronics.

In summary, the Samsung 21700-40T is a premium 21700 4000mAh battery engineered to exceed expectations in power-intensive fields. Whether powering a Power tool battery, supporting UAV flight, or operating in mobile off-grid systems, this High rate battery delivers consistent, safe, and robust performance trusted across industrial sectors.

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.

Related Blogs