Battery Widget Pro is a free utility tool for Android that allows you to monitor your device's battery status and estimate the remaining time. Developed by JH Jeong, this app displays battery information such as level, temperature, and voltage. It also notifies you when your battery is being consumed too fast and sends periodic "Toast" messages.

One of the major features of Battery Widget Pro is the battery usage history graph that helps you keep track of your battery usage over time. Additionally, the app supports SD card usage (only for the 2x1 widget), customizable colors, and backgrounds. The app offers three different widget sizes: 1x1, 2x1, and notification bar support.

It is important to note that the app does not collect real-time estimation time and graph data, as the main design concept is to consume battery power for monitoring as little as possible. Before purchasing the app, you can try the lite version [Battery Widget] to test its features.

Overall, Battery Widget Pro is a useful tool for anyone who wants to monitor their device's battery status and usage history.