The battery management isn't the problem. The problem is the actual hardware. You cannot run an RTX graphics card anywhere near peak performance on a battery. It's just not gonna happen. Nothing in software can fix something that's limited by physics.
I mean they are trading off performance or battery life. But they could easily run RTX cards in a laptop at full power but issues like thermals and poor battery life come up. If you design it just for speed than you'll end up with a massive 12lb brick that you can barely call a laptop