If I were to conduct a long-term review of my Xiaomi Mi 10T Pro, I should highlight the drop in battery life that started after around a year of use. Without much fear of being mistaken, I will say that the cause for going down from over 6 hours SoT to roughly 4 hours combines the battery fatigue with various software problems.
My old Mi A1 still has the original battery and is now being mercilessly tortured by my daughter on a daily basis, and I can't even hope for the one of my Mi 10T Pro to last that long. While MIUI 13.5 might bring some real power optimizations to my phone, the most recent update only arrives with the latest security patch.
The new update became available for my phone earlier today and it has 301 MB in size. Sadly, there's not much to say about it. The label follows the previous pattern, so the patch brings the phone's software version up to 126.96.36.199.SJDEUXM. The Android version is still 12, and the long version number is also unchanged, namely 12 SKQ1.211006.001. Since this is a security refresh, the patch date now says September 1, 2022.
I couldn't fully drain the battery yet, but my screen used over 21 percent in less than two hours, with almost 14 percent going to the updater. Based on these, I can safely assume that MIUI 13.0.9 doesn't come with any noticeable battery life improvements.
Fortunately, the Mi 10T Pro, Mi 10T, and Mi 10T Lite are all (supposedly) eligible to receive the MIUI 14 update. Since this major software update from Xiaomi is scheduled to arrive before the end of the year, there is no information regarding its availability for older handsets such as the three ones mentioned above.