Question asus tp3604va battery life

Dec 28, 2023
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laptop model: Asus tp3604va (S16 flip oled)
issue: terrible battery life

I have been using this laptop for few days and I get around 3 hours of battery life with lite use (opera browser only) in battery saving mode using 70 precent of brightness with 60hz with 3.2k resolution, to be honest I expect double the battery life, is this normal for this laptop? I have already contacted Asus and they said it is normal, I also want to know if the tn3604ya have better battery life even tough it has smaller battery (50wh compared to 70wh) because I understood that the ryzen 7 7730u is way more power efficient than the i5 13500h. I also noticed that the laptop get a little bit warm after lite use of it.
Thanks for the help.

link for tp3604va:
link for tn3604ya: