@none Hello my friend. I tested the underclocked version of Prime for a full day (24h). I saw a significant improvement in the battery lasting. With sim, data, bt, wrist movement activated and medium usage, the battery used to be drained about 4-5% per hour. With the underclocked version i had about 3%.
But i found difficult to acivate the watch with the wrist movement. It worked for 10% of all the times i wanted to activate the screen on purpose.
I tested all the other features and apps of the watch, everything seemed to work fluently.
The wrist movement would’t be a thing if my power button wasn’t about to die 
So, i flashed back the official boot.img. Keep up the good work 