Battery Graph Widget
A free program for Android, by Tomas Hubalek.
Samsung's latest Galaxy smartphones come with OneUI 5.1 software, which includes a new Battery widget you can place on your Home screen to keep track of all your devices' charging statuses at a glance. The widget comes in two visual formats: a compact "circles" version that displays a circle for each device and its charge level, and an extended "list" version that shows the names of each device alongside their charge bar.
Both versions of the Battery widget offer various settings you can customize: "Devices to show" - choose which Samsung devices you want to include, and their display mode (charging only, not charging or not charging). The widget's color can be changed to match your home screen's dark mode, and you can also select whether to hide the widget's icon or not.
Battery Graph Widget is another option for monitoring your device's battery level, developed by Lubos Mikusiak. This app displays your battery levels over a specified period in the form of a pretty graph, and predicts how much time you have left before the battery runs out, based on usage patterns. The app offers different duration options, a customizable graph, and can be added to the Notification Center. The widget features a cute flower design, and the petals of the flowers change colors as your battery's charge decreases. The app can also be used to monitor other devices and chargers connected to your smartphone, as well as the CPU usage of your Android device.