How to Replace the 18650 Battery: Choosing the Right Alternative |

The battery is a common cylindrical lithium battery with a size of 18mm in diameter and 65mm in length. Its nominal voltage is usually 3.7V, and its capacity ranges from mAh to mAh. Due to its widespread use in various devices, such as power tools, electric toys, and laptops, many people consider finding a replacement when the battery is damaged or needs upgrading. So, apart from the battery, what other batteries can serve as alternatives? What key factors should we consider when selecting a replacement battery? This article will analyze the key aspects such as battery size, chemical composition, and performance in detail.

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Consider the Size

The most important factor when replacing an battery is the size. If the device’s battery compartment has strict size limitations, you may not be able to use a battery with a different size. In many devices, the battery compartment is designed to fit only the size. Therefore, before considering a replacement battery, it is crucial to confirm whether the device can accommodate the new battery size.

Battery

• Size: 21mm diameter * 70mm length
• Capacity: mAh ~ mAh
• Common Applications: Electric bicycles, power tools, energy storage devices, drones, etc.
• Advantages: Larger capacity than the battery, suitable for extended use and can provide more power.
• Disadvantages: Larger size, may not fit the battery compartment of certain devices.

The battery is a common alternative to the battery, typically used in devices with higher power demands. Due to its slightly larger size (21mm in diameter and 70mm in length), it may not fit in some device battery compartments. While the battery has a better capacity and performance than the , it cannot replace the unless the device design allows for the larger size.

Battery

• Size: 26mm diameter * 65mm length
• Capacity: mAh ~ mAh
• Common Applications: Power tools, large flashlights, energy storage devices, robots, etc.
• Advantages: Larger capacity, suitable for devices requiring longer runtime or higher power output.
• Disadvantages: Larger size, not suitable for most small devices.

The battery is larger than the (26mm diameter, 65mm length) and typically has a capacity of mAh or higher, which provides longer usage time and greater power output. However, its larger size means it is mainly used in high-capacity devices such as power tools and large flashlights. The may not fit devices originally designed for batteries unless the device allows for larger batteries.

Battery

• Size: 14mm diameter * 50mm length
• Capacity: 600mAh ~ mAh
• Common Applications: Small power tools, flashlights, remote controls, etc.
• Advantages: Small size, easy to fit in small devices.
• Disadvantages: Small capacity, cannot provide high power or long operation time.

The battery is a compact battery (14mm diameter, 50mm length) with a relatively small capacity, typically between 600mAh and mAh. It is suitable for low-power devices such as remote controls and small flashlights. If you need a replacement for the battery and the device allows for smaller batteries, the could be a good alternative. However, its smaller capacity makes it unsuitable for devices requiring long runtime.

Battery

• Size: 32mm diameter * 140mm length
• Capacity: mAh ~ mAh (high capacity)
• Common Applications: Large energy storage devices, high-power power tools, large electric bicycles, etc.
• Advantages: Very large capacity, ideal for high-power devices and long-term use.
• Disadvantages: Extremely large size, not suitable for most consumer devices.

The battery is a relatively rare, large-sized battery (32mm diameter, 140mm length), suitable for devices requiring extremely high capacity. These batteries are typically used in large energy storage devices or high-power power tools. Due to their large size, batteries are not commonly used in most small electronic devices and are not practical replacements for the unless the device is designed to accommodate such large batteries.

Battery

• Size: 46mm diameter * 80mm length
• Capacity: Estimated mAh ~ mAh
• Common Applications: Electric vehicles, ultra-high-power energy storage devices.
• Advantages: Extremely high capacity and power output.
• Disadvantages: Extra-large size, primarily used in industrial and electric vehicle applications.

The battery (46mm diameter, 80mm length) is a new type of battery being adopted by companies like Tesla for electric vehicles and large-power energy storage systems. While it provides very high capacity and energy density, its extremely large size and specialized design make it unsuitable as a direct replacement for the battery, with a very limited range of application.

Consider the Chemical Composition

Besides size, the chemical composition of the battery is also a key factor. Different types of batteries differ in their chemical composition, which determines their voltage, capacity, and charge/discharge characteristics. The battery typically uses lithium-ion chemistry, such as lithium cobalt oxide (LiCoO2), ternary lithium (NCM/NCA), or lithium iron phosphate (LiFePO4). When choosing a replacement battery, it is crucial to ensure the new battery has similar voltage and charge/discharge characteristics to the original to ensure the device operates properly.

Lithium-ion Batteries (e.g., , , etc.)

These batteries use lithium-ion technology, just like the , and have similar voltage and charging characteristics, making them effective alternatives. However, different lithium batteries may use different electrolytes and chemical materials, which can affect performance.

For more information, please visit Lithium Battery ICR mAh 3.7V|Lithium Battery for Electric Devices.

Nickel-Metal Hydride (NiMH) Batteries

NiMH batteries can also replace some batteries, but their voltage is typically 1.2V, instead of 3.7V. This means that multiple batteries need to be connected in series to achieve the required voltage. However, NiMH batteries have lower energy density and generally cannot provide the same performance as lithium batteries.

AA Batteries

Although AA batteries are commonly used in various devices, their voltage is only 1.5V, much lower than the 3.7V of the battery, so they are not suitable as a direct replacement. If the device’s battery design allows for multiple batteries to be connected in parallel or series, AA batteries could be a temporary solution, but their capacity and performance fall far short of the battery.

Performance Comparison of Alternative Batteries

Battery Model

Voltage (V)

Capacity (mAh)

Advantages

Disadvantages

3.7 - Widely used, good capacity/volume ratio Limited capacity and size 3.7 - Higher capacity, suitable for long-term use Larger size, may not fit device 3.7 - High capacity, suitable for high-power devices Larger size, not suitable for most devices 3.7 600- Compact, suitable for small devices Smaller capacity, limited use range

Conclusion

When replacing the battery, the first step is to confirm whether the device can accommodate the new battery size and chemical composition. If the device has strict size requirements, you may only be able to choose a battery of a similar size, such as the battery. If the device has higher capacity and voltage requirements, the and batteries are good alternatives, while the battery is suitable for smaller devices. If the replacement is only concerned with the battery chemistry, lithium-ion batteries remain the best choice.

Are you interested in learning more about LiFePO4 Rechargeable Prismatic Battery? Contact us today to secure an expert consultation!

Post time: Dec-24-