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A 3-cell battery holder or socket is designed to hold three individual batteries and connect them in series. This setup is commonly used to power devices requiring a higher voltage than a single battery can provide. Here’s an overview of the key aspects of a 3-cell battery holder:

Types of Battery Holders:

1. AA Battery Holder: Designed to hold three AA batteries.
2. AAA Battery Holder: Designed to hold three AAA batteries.
3. Custom Holders: Holders for other battery types (e.g., 18650 cells) can be customized for specific needs.

Key Features:

• Voltage Output: Typically provides a combined voltage equal to the sum of the individual batteries. For example, three AA batteries (1.5V each) will provide 4.5V in total.
• Material: Usually made from plastic or a combination of plastic and metal contacts.
• Connections: Often includes leads or terminals for easy connection to your circuit. Some holders come with solderable tabs or wires for attachment.
• Mounting: May come with mounting holes or adhesive backing for securing the holder in place.

Typical Applications:

• Electronics Projects: For powering circuits requiring higher voltage.
• Portable Devices: Power supply for battery-operated devices.
• Robotics: To provide power to various robotic components.

Example Holders:

1. 3x AA Battery Holder:

   • Voltage: 4.5V (3 x 1.5V AA batteries).
   • Connection: Wires or terminals.
   • Size: Fits three AA batteries in series.

2. 3x AAA Battery Holder:

   • Voltage: 4.5V (3 x 1.5V AAA batteries).
   • Connection: Wires or terminals.
   • Size: Fits three AAA batteries in series.

3. 3x 18650 Battery Holder:

   • Voltage: Varies depending on the battery type (usually 3.7V per cell, so 11.1V total for three cells).
   • Connection: Wires or terminals.
   • Size: Designed for 18650 lithium-ion cells.

How to Use:

1. Insert Batteries: Place the batteries into the holder, ensuring they are oriented correctly (usually indicated by markings inside the holder).
2. Connect to Circuit: Use the holder's terminals or wires to connect to your electronic circuit.
3. Secure the Holder: If needed, use mounting holes or adhesive backing to secure the holder in place.