Default Adreno 330 Battery Hog?

I usualy don't play t much graphic intense games but when i do my batteyr just goes all the way down. For ex i've been playing Dungen Hunter 4 and 30 min of gameplay is more or less 20%, thats insane, all the graphics at max.
At it happens with other games also, is there a way to undervolt or have less power so it doesn't onsume much?
Thanks in advance.