Ya está la 8.7.12 para descargar. No veo que diga en ningún largo que han solucionado el consumo de batería en el nuestro:
CHANGELOG 8.7.12
Lockscreen, Status Bar, Notification Bar
Optimization - Face unlocking speed (07-12)
Fix - The problem of flashing screen in the process of fingerprint unlocking (07-12)
Fix - Fixed background in PIP mode
Themes
Fix - Fixed themes details loading
Fix - Fixed Nature sound missing in sounds
Security
Fix - Security stops working [Redmi Note 4]
Optimize - New Security Center UI
Notification
Fix - No notification on lock screen [Mi 6]
Optimize - Media volume can be changed only when media playing (same as in MIUI 9)
Camera
Fix -The video is stuck when taking 1080P video [Mi 5]
New - AI Portrait mode for single camera devices [Android 8.x] (07-06)
New - AI Portrait mode for the front camera [Android 8.x] (07-06)
Lock screen
Fix - Phone can unlock without password/fingerprint/pattern [Mi 6]