Can gains affect battery life?

Kinda noobish question but, I've been running an f550 naza v2 with the new e300 system at the default naza gains (125,125,100,100), and it's been running pretty well, just slightly sluggish. I see on other threads most people running f550 at like 170% gains across the board! So I've decided to bump them up a bit to test, I'm at 150% pitch and roll now (yaw was a bad idea), and it seems more stable and crisper, but it appears my normal flight time of 10-12 minutes has dropped to like 6-8 mins? Also the whole thing just sounds louder. Is this something that's normal, or is there something else going on?
 

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