USB CR2032 Dummy Battery Power Supply Cable with Switch

Power your CR2032-operated devices continuously with this handy USB to 3V CR2032 Dummy Battery Power Supply Cable. Simply insert the slim fake battery adapter into any standard CR2032 battery slot and connect the USB end to any 5V USB power source — no more swapping out coin cell batteries during extended use. An inline on/off switch gives you full control over power delivery at a moment's notice.

Ideal for watches, remote controls, microphones, toys, LED tea lights, key finders, calculators, and countless other gadgets that run on a CR2032 coin cell battery. Available in 4 color options and approximately 0.5 meters (1/2 M) in length, this cable is versatile enough to work in tight spaces while giving you enough reach to a USB power bank or wall adapter.

Key Features

• Continuous USB Power: Converts USB 5V input to a steady 3V output — perfectly matching the CR2032 voltage requirement
• Inline On/Off Switch: Instantly cut or restore power without unplugging the cable
• Slim CR2032 Dummy Insert: Fits snugly into standard CR2032 battery compartments
• Approximately 0.5M Cable Length: Long enough for flexible positioning near a USB port or power bank
• 4 Color Choices: Pick the option that best suits your setup
• Broad Compatibility: Works with watches, microphones, remote controls, toys, and other CR2032-powered devices
• Eliminates Battery Waste: Great for lab work, long-running demonstrations, or any situation requiring uninterrupted power

Specifications

• Input: USB 5V
• Output: 3V DC (CR2032 equivalent)
• Cable Length: ~0.5 meters
• Battery Type Replaced: CR2032 coin cell
• Switch: Inline on/off toggle
• Available Colors: 4 options

What's in the Box

• 1 × USB to CR2032 Dummy Battery Power Supply Cable with Inline Switch

For general guidance on electronic components and safe use of low-voltage accessories, visit the U.S. Consumer Product Safety Commission (CPSC).

Learn more: Power cable

Frequently Asked Questions

Q: What devices is the USB CR2032 dummy battery power supply cable compatible with?

A: This cable is compatible with any device that uses a standard CR2032 coin cell battery, including watches, remote controls, microphones, small toys, LED tea lights, key finders, and calculators. As long as the device accepts a CR2032 and runs on 3V, this cable can supply continuous USB power to it.

Q: What USB power source do I need to use this cable?

A: Any standard 5V USB power source will work — including USB wall adapters, power banks, laptop USB ports, and USB hubs. The cable's built-in circuitry steps the voltage down to a stable 3V output to match the CR2032 specification.

Q: How does the inline switch work?

A: The inline on/off switch is located along the cable between the USB plug and the dummy battery insert. Toggling it cuts or restores power to your device instantly, giving you convenient control without unplugging the cable from your USB source.

Q: Will this cable fit all CR2032 battery slots?

A: The dummy battery insert is designed to fit standard CR2032 coin cell battery compartments. It may not fit in very compact or non-standard housings where the battery tray is recessed or has an unusually tight lid — we recommend checking your device's battery compartment dimensions before purchasing.