Here is the battery performance of Galaxy Note10 Lite after Android 12 update. It gives around 5 hour 30minutes on screen time and about 14 hours Screen off time. I think it's better.
It's slightly reduce but not that much...about 20-30mins only because it depends on user as Note10 Lite also have S pen when we use the S pen and put it back it uses the phones battery to charge the pen that why it gives less battery backup but i think about 6 hour screen on time is okay. But i found some issue that google is consuming too much battery in short period because on 19th Jan, 9 min active on google consumed 18% battery but can't tell now i think the phone is getting optimised with android 12..as yesterday, 25min active on google only consume 5.4%
Now i am getting good battery life about 5hr 45mins Screen on time and i have used it without power saving mode. 
