Raspberry Pi 12.5W Micro-USB Power Supply 5.1V 2.5A

Specifications

• Input Voltage: 90-264V AC (Universal)

• Output: 5.1V DC @ 2.5A

• Max Power: 12.5W

• Connector: Micro-USB (Captive Cable)

• Cable Length: 1.5 Meters (18AWG High-Conductivity Copper)

• Colour: White

• Protection: Short circuit, over-current, and over-temperature protection.

• Plug Type: India/Europe 2-Pin (Type C/D compatible)

Key Applications & Projects

• Retro Gaming Consoles: Powers RetroPie setups on Pi 3B+ without lagging during intense emulation.

• Home Assistant Servers: Provides 24/7 reliability for smart home hubs running on Raspberry Pi Zero 2 W.

• OctoPrint Servers: Ensures your 3D printer server doesn't crash mid-print due to power fluctuations.

• Digital Signage: Stable power for displays running continuously in commercial environments.

Project Evolution

• The Bottleneck: Using a random 5V/1A Android charger limits your Raspberry Pi's CPU speed and prevents you from using USB hard drives.

• The Upgrade: This 2.5A supply acts as a stabiliser. It unlocks the ability to attach USB webcams, speakers, and external drives simultaneously without rebooting the system.

• Effort Level: Beginner. Simply plug it in. The Probots™ Lab Verified ???? testing confirms it eliminates under-voltage warnings instantly.

Virtual Technician & Wiring Guide

• ⚠️ Compatibility Warning: This uses a Micro-USB connector. It is NOT compatible with the Raspberry Pi 4 or Pi 5 (which use USB-C).

• Cable Discipline: The 1.5m cable is fixed. Do not cut or splice it, as altering the length will affect the calibrated voltage drop compensation.

• Heat Note: The adapter block may become warm to the touch during full load (compiling code/rendering). This is normal.

Accessories & Compatibility

• Included: 1x Official 12.5W Micro-USB Power Supply (White).

• Compatible Boards: Raspberry Pi 3 Model B+, Raspberry Pi 3 Model B, Raspberry Pi Zero 2 W, Raspberry Pi Zero W, Raspberry Pi 1/2.

• Related: Raspberry Pi Zero 2 W Case, Micro-USB to USB-A Data Cable.

Frequently Asked Questions (Technical SEO)

• Will this work with the Raspberry Pi 4 or 5? No, this power supply uses a Micro-USB connector. The Pi 4 and 5 require a USB-C connector.
• Why is the output 5.1V instead of 5V? The extra 0.1V compensates for voltage loss across the 1.5m cable, ensuring the Pi receives exactly 5V at the board level.
• Does this fix the undervoltage warning (lightning bolt)? Yes, this is the official solution designed specifically to eliminate the undervoltage warning on Pi 3 and Zero models.
• Can I use this for the Raspberry Pi Zero 2 W? Yes, it is the recommended power supply for the Zero 2 W, providing ample headroom for accessories.
• Is the cable removable? No, the cable is captive (permanently attached) to ensure the correct wire gauge is used for 2.5A current.
• Can I use this to charge my phone? Yes, if your phone has a Micro-USB port, it will charge it safely, though likely at standard speeds (not Quick Charge).
• What happens if I use a 5V/1A charger instead? Your Pi may boot, but it will likely crash, reboot, or corrupt the SD card when the CPU works hard or WiFi turns on.
• Is this supply isolated? Yes, it is a Class II double-insulated power supply, safe for handling.
• Does it have an On/Off switch? No, official Raspberry Pi power supplies do not have inline switches to avoid introducing unnecessary resistance.
• Can I power a Raspberry Pi 3B (non-plus) with this? Yes, it is fully backward compatible with all older Raspberry Pi models (1, 2, and 3).
• What is the length of the cable? The cable is 1.5 meters (approximately 5 feet) long.
• Is this the India plug version? Yes, this SKU comes with the standard 2-pin plug compatible with Indian sockets.
• Can I use this for an Arduino Uno? The Arduino Uno uses a USB-B or Barrel Jack. You would need an adapter, making this unideal. It works for Micro-USB Arduinos (like Leonardo/Micro).
• Does it support 220V AC input? Yes, it supports a universal input range of 90-264V AC, so it works perfectly on Indian 230V mains.
• What is the wire gauge of the cable? It uses thick 18AWG wires to minimize resistance and voltage drop over the 1.5m length.
• Will this power an external Hard Drive attached to the Pi? It provides 2.5A total. The Pi 3 takes ~0.7A, leaving ~1.2A for USB. It can power one portable HDD, but a powered hub is better for multiple drives.
• Is this a switch-mode power supply (SMPS)? Yes, it is a high-efficiency SMPS, generating less heat than older linear transformers.
• Can I leave it plugged in 24/7? Yes, it is industrial-grade and designed for continuous operation in servers and appliances.
• Does it work with the Raspberry Pi Pico? Yes, the Raspberry Pi Pico uses Micro-USB and runs perfectly on this supply.
• Why is this more expensive than generic chargers? It uses high-quality capacitors and a custom design to maintain stable voltage under rapid load changes, which generic chargers fail to do.