The embedded fuel gauge microcontroller has received new calibration curves. This resolves a long-standing issue where the battery percentage would jump from 15% to 5% under heavy load. Post-update, discharge linearity improves by an estimated 8-10%.
Technical Analysis: Firmware Change and Update Procedures for HTC One X9 1. Introduction Firmware updates for the HTC One X9 Go to product viewer dialog for this item. Firmware Change Update on HTC One X9