AS18650 25.9V 10Ah Lithium-Ion Battery Pack

AS18650 25.9V 10Ah Lithium-Ion Battery Pack

An Overview of the 18650 25.9V 10Ah Lithium-Ion Battery: 

Specifications and Applications

In the rapidly advancing world of rechargeable batteries, the 18650 lithium-ion battery stands 

out as a popular and versatile choice for various electronic applications. Among the many variants,

the 18650 25.9V 10Ah battery offers a great balance between power, capacity, and compactness. 

This blog will explore the key features of this battery, including its size, weight, capacity, applications, 

and technical specifications.

1. What is the 18650 25.9V 10Ah Battery?

The term “18650” refers to the battery's dimensions, where 18 signifies a diameter of 18mm, and 

65 indicates a length of 65mm. These cylindrical cells are known for their high energy density and are 

widely used in portable electronic devices, power tools, and electric vehicles. The 25.9V 10Ah battery is 

a pack made up of several 18650 cells connected in series and parallel to reach a voltage of 25.9V and 

a capacity of 10Ah (Ampere-hours).

1.1 Key Specifications

l Voltage: 25.9V

l Capacity: 10Ah

l Configuration: Typically, this configuration would consist of 7S (7 cells in series) and a suitable 

number of parallel strings to meet the capacity requirement.

l Battery Type: Lithium-ion

l Dimensions: Dependent on the specific arrangement of the cells but typically compact for its power capacity.

l Weight: The weight of a 25.9V 10Ah battery pack varies depending on the configuration and protective casing, 

but generally, it weighs between 1.5 to 2 kg.

The 25.9V rating indicates the nominal voltage of the battery pack, which can fluctuate slightly during charging 

and discharging. The 10Ah rating reflects the total energy storage capacity of the battery, indicating how long 

the battery can deliver power before needing a recharge. Together, these parameters make the battery suitable 

for various demanding applications that require both reliability and extended operation times.

2. Size and Weight Considerations

Lithium-ion batteries are preferred for their high energy density, meaning they pack more power into a smaller, 

lighter form factor compared to older battery chemistries like lead-acid or nickel-cadmium. The 18650 cells are 

cylindrical, with dimensions of 18mm in diameter and 65mm in length, but when combined into a battery pack, 

the overall size depends on how the cells are arranged.

In a 25.9V 10Ah configuration, the cells are typically arranged in a series-parallel setup. A standard battery pack 

could range from 200mm to 300mm in length, 60mm to 80mm in width, and 40mm to 80mm in thickness, 

depending on the specific arrangement. The weight of the battery is also impacted by additional components 

like the Battery Management System (BMS), protective casings, and connectors.

Despite its compact size and light weight (around 1.5 to 2 kg), the 18650 25.9V 10Ah battery provides substantial 

power, making it ideal for applications where both portability and power are crucial.

3. Applications of the 18650 25.9V 10Ah Battery

One of the standout features of this lithium-ion battery is its versatility. Its balance between capacity and voltage 

makes it an excellent choice for various applications. Below are some key fields where the 18650 25.9V 10Ah battery 

is widely used.

3.1 Electric Bicycles and Scooters

Electric mobility solutions, such as e-bikes and e-scooters, have become increasingly popular due to their 

eco-friendliness and convenience. The 18650 25.9V 10Ah battery is commonly used in these vehicles because it 

offers enough power to drive the motor for a significant distance while being lightweight enough to avoid adding 

unnecessary bulk to the design.

For example, a 25.9V 10Ah battery pack can typically provide sufficient energy for a small e-bike to travel 20-30 

kilometers on a single charge, depending on factors like rider weight, terrain, and motor efficiency.

3.2 Power Tools

The high discharge rate and power density of the 18650 cells make them ideal for power tools that require bursts 

of energy. Many cordless drills, saws, and other power tools are designed to use battery packs in the 25V to 30V 

range, and the 25.9V 10Ah battery fits perfectly in this category.

3.3 Consumer Electronics

In the world of consumer electronics, lithium-ion batteries have revolutionized the way we power portable devices. 

Although smaller devices typically use lower voltage batteries, the 25.9V 10Ah battery can be used in more substantial 

equipment such as drones, RC vehicles, and high-powered audio equipment. These batteries are also popular in DIY 

projects for hobbyists who need a reliable and compact power source.

3.4 Solar Energy Storage

The 25.9V 10Ah battery is a great option for storing solar energy in off-grid systems. When combined with solar panels, 

these batteries can store excess energy generated during the day for use at night or during cloudy periods. Their 

high energy density and cycle life make them a cost-effective and efficient solution for small to medium-scale solar 

installations.

3.5 Medical Devices

Medical devices such as portable oxygen concentrators and other life-saving equipment rely on battery power for 

uninterrupted operation. The 18650 25.9V 10Ah battery's compact size, high energy density, and long cycle life 

make it an ideal choice for powering these critical devices.

3.6 Robotics

Robots, both in industrial and hobbyist contexts, often require powerful and long-lasting batteries. The 25.9V 10Ah 

lithium-ion battery provides enough power to run motors, sensors, and other robotic components, allowing for extended 

operation without frequent recharging.

4. Advantages of the 18650 25.9V 10Ah Battery

There are several reasons why the 18650 25.9V 10Ah battery has become a preferred power source for many applications. 

Below, we explore some of its key advantages:

4.1 High Energy Density

Compared to other battery types, such as lead-acid or nickel-metal hydride (NiMH), lithium-ion batteries offer significantly 

higher energy densities. This means that they can store more energy in a smaller space, making them ideal for applications 

where size and weight are critical factors.

4.2 Long Cycle Life

Lithium-ion batteries are known for their longevity. A typical 18650 battery can undergo 500 charge-discharge cycles before its 

capacity begins to degrade significantly. With proper care, the 18650 25.9V 10Ah battery can last several years, even 

with frequent use.

4.3 Low Self-Discharge

One of the drawbacks of older battery technologies is that they tend to lose charge over time, even when not in use. 

Lithium-ion batteries, however, have a very low self-discharge rate, meaning they can retain their charge for extended 

periods without needing to be recharged.

4.4 Lightweight and Compact

Thanks to their high energy density, lithium-ion batteries are much lighter and more compact than their lead-acid counterparts. 

This makes them ideal for applications where weight is a concern, such as in electric vehicles and portable electronics.

4.5 Safety Features

Modern lithium-ion battery packs, including the 18650 25.9V 10Ah variant, are equipped with built-in safety features such 

as short-circuit protection, overcharge protection, and thermal shutdowns. These features help prevent accidents and 

ensure the longevity of the battery.

5. Safety Considerations

While lithium-ion batteries are generally safe to use, they do require certain precautions to ensure their safe operation. 

Overcharging, overheating, and physical damage to the battery pack can pose safety risks, including the possibility 

of fire or explosion. Therefore, it's essential to use a high-quality Battery Management System (BMS) to monitor the 

battery's performance and prevent unsafe conditions.

When using these batteries in demanding applications, it’s crucial to follow the manufacturer’s guidelines for charging, 

discharging, and storage. Avoid exposing the battery to extreme temperatures and ensure it is used in a well-ventilated 

area to prevent overheating.

6. Conclusion

The 18650 25.9V 10Ah lithium-ion battery is a versatile and powerful solution for a wide range of applications, from 

electric vehicles to consumer electronics and solar energy storage. Its high energy density, long cycle life, and lightweight 

design make it an ideal choice for users who need reliable, long-lasting power in a compact form.

With the continued growth of the lithium-ion battery market, the 18650 cell configuration, in particular, remains a 

cornerstone of modern battery technology, providing solutions to both small and large-scale energy storage challenges. 

Whether you’re building a new product or upgrading an existing one, the 18650 25.9V 10Ah battery offers a robust and 

dependable power source that’s worth considering.