Charging Info is a free widget-only application for Android devices that lets you measure the efficiency of your charger. Once installed, simply drag the widget to your home screen to get started.

While your phone is charging, Charging Info shows the milli amperes (mA) that your charger is sending to your battery. The more mA, the faster your battery will charge. If your phone is on battery, the app also shows the mA that your phone is consuming.

If the app cannot measure the incoming or consuming mA, the value displayed will be 0. Additionally, the app estimates the time required to fully charge your phone when the charger is plugged in and the time until the battery is empty when the charger is unplugged.

Upgrading to the pro version for less than $1 will enable more features such as the ability to choose the color and size of the displayed text, enable the notification bar, and enable an overlay display of the info shown on the widget.