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The 9V Battery Holder Case Box with DC Barrel Jack provides a safe, clean, and portable power supply solution for embedded electronics and microcontrollers. Manufactured from high-grade flame-retardant ABS plastic, this fully enclosed holder protects standard 9V (6F22 / PP3) batteries from physical impacts, environmental dust, and accidental metal shorts.

Equipped with a standard $5.5\text{mm}\times 2.1\text{mm}$ center-positive male DC barrel plug, this module connects directly into the onboard power jack of microcontrollers like the Arduino Uno or Mega. The built-in SPST sliding ON/OFF toggle switch allows users to instantly shut off power to their project without repeatedly unplugging the DC jack, preserving battery life and reducing connector wear. The removable sliding cover, combined with internal brass pressure terminals, holds the battery firmly in place even under movement and vibration.

Key Features and Benefits

• Plug-and-Play DC Barrel Jack: Standard $5.5\text{mm}\times 2.1\text{mm}$ male DC plug connects directly to Arduino, Mega, ESP32 expansion shields, and DC motors.

• Integrated ON/OFF Toggle Switch: Conveniently isolate battery power without removing the battery cell or unplugging the barrel jack.

• Fully Enclosed ABS Housing: Protective slide cover shields the 9V cell from physical drops, dust, and short-circuit hazards inside project boxes.

• Center-Positive Polarity Standard: Wired according to industry standards (Inner core $=+9\text{V DC}$, Outer sleeve $=GND$).

• Flexible Stranded Cable: Heavy-duty insulated wire strain-relief resists flexing and breaking during repetitive plugging.

Technical Specifications

Polarity & Arduino Connection Guide

• Center Pin (Inner $2.1\text{mm}$ Core): Positive output ($+9\text{V DC}$)

• Outer Sleeve ($5.5\text{mm}$ Shell): Negative ground ($0\text{V}/GND$)

ARDUINO VOLTAGE REGULATOR ADVISORY: Connecting a 9V battery via the onboard DC jack feeds power through the board's internal $5\text{V}$ linear regulator (VIN). This setup provides a clean $5\text{V}$ power rail to the microcontroller logic. Avoid drawing high continuous currents ($>300\text{mA}$) through the Arduino 5V pin when powered by a 9V battery to prevent excessive regulator heat.

Applications

• Arduino Development Boards: Direct DC jack power supply for standalone Arduino Uno, Mega 2560, and Leonardo projects.

• Robotics & Smart Cars: Auxiliary logic power supply for motor controller shields and sensor arrays.

• Portable Testing Instruments: Powering handheld digital multimeters, signal generators, and custom field-testing gadgets.

• DIY Audio & Effects Pedals: Clean $9\text{V}$ DC power source for guitar effect pedal circuits and mini audio preamps.

Package Includes

• 1 x 9V Battery Holder Case Box with DC Barrel Jack ($5.5\text{mm}\times 2.1\text{mm}$) and ON/OFF Switch

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components