If you are interested in monitoring your car and its battery, seeing live data, and gathering data for Battery Power and Volts graphs, and saving the graph data, then you might be interested in the Alpha version TM-Spy app, currently being created for Android by Turbo3, who wrote the great Leaf Spy apps for Android and iOS. Eventually, an iOS version of TM-Spy should be available. If interested, see ... Using TM-Spy to see Model S data. Post #20 there tells how to become a TM-Spy Tester. Cheers, Gary
Since TM-Spy is still in the testing stage, the app cannot be seen on the Google Play Store unless you are a TM-Spy Tester. Ver 0.0.7 now.