Lag while playing games with battery?

I'm using lenovo y510p. And i think this problem every laptop has.while i'm playing games without charger, the game i played will be lag. I tried to change the power saving to high preformance. But it still doesn't works.is there any other way? I juz bought my laptop few weeks only.

In every preset there are advanced settings, which feature CPU power management, you can adjust max. Processor state. Have a look there. Also, the graphic card has power management profiles, check it in the drivers' settings.