The Redmi 15 5G (released early 2026) is the ultra-endurance model of the lineup, distinguished by its massive 7,000mAh Silicon-Carbon battery—the largest in its segment—which supports up to 2.3 days of use on a single charge. It features a sprawling 6.9-inch FHD+ display with a high 144Hz AdaptiveSync refresh rate, providing an exceptionally smooth experience for scrolling and gaming. Performance is driven by the Snapdragon 6s Gen 3 chipset with up to 16GB of extended RAM, while its design is both practical and premium, featuring an aerospace-grade metal camera island and IP64 dust and splash resistance. For photography, it utilizes a 50MP AI dual camera system enhanced by creative AI tools like AI Erase and AI Sky, making it a powerful, long-lasting all-rounder for users who prioritize battery life and screen real estate.