The USB Charger Capacity Tester (Current & Voltage Detector) is an essential diagnostic tool for anyone looking to verify the performance of their charging equipment. At Electrapac, we recommend this pocket-sized tester for technicians and tech enthusiasts in Bangladesh who want to identify fake power banks, test cable quality, or monitor the charging health of smartphones and tablets.

Product Overview

This "USB Doctor" is a pass-through device that sits between your power source (charger/power bank) and your device. It features a bright, backlit LCD that simultaneously displays real-time voltage, current draw, and the total capacity (mAh) delivered over time. It is the perfect tool for determining if a "Fast Charger" is actually delivering its rated power or if a USB cable is causing slow charging due to high resistance. 

Key Features for Electrapac Customers

• Simultaneous Monitoring: View Volts (V) and Amps (A) at a glance to see exactly how much power your device is drawing in real-time.

• Capacity Tracking (mAh): Measure the actual capacity of your power bank or phone battery by tracking the total energy transferred during a full charge cycle.

• Data Memory: Even if the power is disconnected, the module saves the accumulated mAh and time data, allowing you to resume your capacity test later.

• Identify Bad Cables: Use this tester to compare different USB cables. A high-quality cable will show a higher current (A) reading compared to a thin, low-quality one.

• Plug-and-Play: Requires no batteries or external power. It draws the tiny amount of energy it needs directly from the USB port it is testing.

How to Use Your USB Tester

Using the Electrapac USB Detector is straightforward for both beginners and pros:

1. Insert the Tester: Plug the male USB end into your charger, laptop port, or power bank.

2. Connect Your Device: Plug your charging cable into the female USB port of the tester.

3. Read the Screen:

   • Voltage: Should be around 5V for standard USB (or 9V/12V for Quick Charge).

   • Current: Displays how "fast" the device is charging.

   • Capacity: Shows how much "juice" has entered the battery.

4. Reset: To start a new test, press and hold the Reset Button for 3–5 seconds to clear the mAh and time readings.

Pro-Tip: If your phone supports "Fast Charging" but the tester only shows 0.5A, it usually means the charger or the cable is not compatible with the phone's fast-charge protocol. This tester helps you spot the weak link in your charging setup instantly!

Primary Applications

• Power Bank Testing: Verifying if a "20,000mAh" power bank actually holds as much charge as advertised.

• Charger Quality Check: Testing if a wall adapter can maintain a stable 5V even under a heavy 2A load.

• Solar Panel Projects: Monitoring the output of DIY USB solar chargers to find the best angle for the sun.

• Device Troubleshooting: Determining if a phone that won't turn on is actually drawing current or if the charging port is broken.

• Laboratory Experiments: Measuring the power consumption of USB-powered microcontrollers like the Arduino Nano or Raspberry Pi.

Why Shop at Electrapac?

We source our USB Capacity Testers with high-precision sampling resistors to ensure that your readings are accurate and reliable. Visit us at www.electrapac.com for the diagnostic tools that take the guesswork out of your tech.