To diagnose and resolve battery drain issues, I will begin by monitoring battery usage through the Android Profiler in Android Studio. Identifying which features consume the most battery is essential. Optimizing network usage is also crucial, so I will batch network requests to minimize their frequency. Additionally, I will examine background services to ensure they are not running excessively. I plan to utilize efficient scheduling tools like JobScheduler and WorkManager. For critical tasks, I will consider implementing foreground services. Conducting tests on real devices is important to validate these optimizations. My objective is to maintain the functionality of features while effectively reducing battery consumption.