March 2025 monthly summary for home-assistant/core focused on feature delivery and integration reliability. Delivered ApSystems Battery Inverter System Support by updating the apsystems library to support battery inverter functionality and by modifying the data coordinator and switch components to properly handle battery system status. This enhances device compatibility, improves accuracy of energy-management data, and enables more reliable automations around battery usage. No major bugs fixed this month; work concentrated on feature delivery, library updates, and integration code improvements that reduce configuration friction and increase maintainability. Technologies/skills demonstrated include Python, Home Assistant integration patterns (libraries, data coordinators, switch platform), API/library integration, and version control practices. Business value includes broader hardware support, clearer visibility of battery status in UI, and a stronger foundation for future energy analytics and automation.