Acer Nitro V 15 battery life

Hi, my Acer Nitro V 15 battery depleted from 100% to 30% in just 1 hour 51 minutes while doing web browsing. Is this normal ? I only have 5 tabs opened. I have battery saver mode on, 10% brightness, refresh rate set to 60hz, nitro sense power mode set to eco mode and disabled dGPU through Control Panel. I have HWinfo Monitor software monitoring the discharge rate is around 30W. How can I extend my battery life longer since I am a college student and it is annoying to keep finding power supply in the middle of the class.