3.7V 18500 Battery – Rechargeable Lithium-Ion Cell

3.7V 18500 Battery – Rechargeable Lithium-Ion Cell

The 3.7V 18500 Battery is a rechargeable lithium-ion cell for compatible torches, electronic devices and battery-powered projects. It has a nominal voltage of 3.7V and a cylindrical design measuring approximately 18mm in diameter and 50mm in length.

Its compact size makes it suitable for equipment specifically designed to use an 18500 battery. Before replacing an existing cell, check that your device requires this battery size and voltage. This battery is sold as a piece.

3.7V 18500 Battery Specifications

What Is a 3.7V 18500 Battery Used For?

The 3.7V 18500 Battery is designed for devices that accept this particular lithium-ion cell format. Common applications include:

• Torches and lighting equipment: For compatible rechargeable lighting devices.
• Electronic devices: For equipment designed to operate with a 3.7V 18500 cell.
• DIY electronics projects: For suitable portable circuits and battery-powered builds.
• Battery replacement: For devices whose original battery specification calls for an 18500 lithium-ion cell.

Always check the device’s battery requirements before installation. A battery should match the required size, voltage, terminal arrangement and electrical specifications.

18500 Battery vs 18650 Battery

The 18500 and 18650 are two different cylindrical lithium-ion battery sizes.

Although both formats have a similar diameter, the 18650 battery is 15mm longer. They are not automatically interchangeable. Use the battery size specified by your device manufacturer.

How to Charge and Handle the Battery

A rechargeable lithium-ion battery requires a compatible charger. Follow these basic precautions:

• Use a charger designed for the specific lithium-ion battery.
• Observe the correct positive and negative terminal orientation.
• Avoid short-circuiting the battery terminals.
• Do not use a damaged, swollen or leaking cell.
• Keep the battery away from excessive heat, fire and moisture.
• Store batteries safely to prevent their terminals from contacting metal objects.

For more information about lithium-ion battery technology, see Battery University’s guide to how lithium batteries work.

Frequently Asked Questions

What is the voltage of an 18500 battery?

A standard 3.7V 18500 lithium-ion battery has a nominal voltage of 3.7V. Its voltage changes as the battery charges and discharges.

What are the dimensions of an 18500 battery?

An 18500 cylindrical cell measures approximately 18mm in diameter and 50mm in length.

Is the 18500 battery rechargeable?

Yes. A standard 3.7V 18500 lithium-ion cell is rechargeable and should be charged using compatible equipment.

Can I use an 18500 battery instead of an 18650?

Not unless your device supports the 18500 size. An 18500 battery is shorter than an 18650, so check your device’s requirements before substituting one for the other.

What devices use an 18500 battery?

Compatible torches, electronic equipment and DIY projects may use this cell format. Confirm the required battery specification before purchasing.

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