A Bluetooth car battery monitor app with over 100,000 downloads was found to be sending GPS, cell phone tower cell IDs, and Wifi beacon data to servers in Hong Kong and mainland China, despite claims that no personal data is collected or sent to third parties. The app's behavior was discovered through reverse engineering efforts. The findings raise concerns about data collection and privacy. The app's developers claim that no data is shared with third parties, but the app's behavior suggests otherwise.