razer 15 advance(mid 2019) battery life suffering on ubunto 18.04

As the title says, I can't extend battery life past the 1h:30m mark, I tried powertop, which did almost nothing and TLP.
although the Nvidia drivers are not working properly, they work enough for me to be able to execute prime-select and run the intel GPU, but with little to no success in improving battery life.
was anybody able to at least reach the 4 hours mark?