![]() ![]() **The Vbatt discharger is based on the open source software Java JBox2D physics engine, which has been ported by Daniel Murphy from the C++ Box2D physics engine, which has been developed by Erin Catto. Logging of the last ten discharger runs (>10min) with date, achieved runtime and the discharged capacity. (The simulation frequency can be used for basic CPU benchmarking.) Displaying the clock and runtime, battery voltage and remaining capacity, battery temperature and the simulation frequency. Before starting the discharger the battery should be fully charged and the phone should be in a comparable state (screen brightness, phone, Wifi, GPS, Bluetooth etc.) The longer the runtime the better the battery. Discharging or draining the battery by running a JBox2D** based simulation (CPU) and keeping the display on (screen light), evaluation of the runtime until the device turns off. The logfile can be analysed afterwards on PC with the help of MS Excel, Open Office Calc or most suitable with GnuPlot. Optionally logging the battery voltage, capacity and state in a CSV logfile on SD-Card: "/mnt/sdcard/vbatt.log". Display of battery temperature (depending on the battery/device) Display of battery states: USB=charging, Batt=discharging, Full=full battery. Configurable min/max limits for the voltage bargraph indicator. Numeric and bargraph indicator for the current battery voltage (volt) and remaining capacity (percentage). The upper and lower limits of the voltage bar graph are configurable because especially the lower limit (power off voltage) considerably varies from device to device and according to the battery load. A third battery however, runs for many hours even with a displayed capacity of just 1%.įor a better estimation of the remaining phone runtime the Vbatt widget displays in addition to the remaining capacity (percentage) the battery voltage. Another one does not even reach this level because the phone powers off before. On of our batteries is almost empty when a remaining capacity of 5% is displayed. The main reason for developing Vbatt was the differing behaviour of replacement batteries while discharging them in daily use. * Vbatt does not require any internet access, is free of advertising and will remain so in the future! * For testing and benchmarking Vbatt provides a JBox2D** based discharger, which drains the battery and displays the clock and runtime and for CPU benchmarking the simulation frequency. It displays the current battery voltage (Vbatt) and the remaining battery capacity (percentage) and optionally logs these values to a CSV-file. * Vbatt is a simple battery widget for Android smartphones and tablets. ![]()
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