Does changing the screen of an iPhone 5s change the battery life?

I broke my screen and two days later i got it fix by one of the random no name stores in the mall. I feel like my battery is dying much faster than what it was before i have no way of proving it but it just feels that way… Does changing the screen affect the battery life? (as in the new screen might consume more battery?) also does the apple warranty still protects my iPhone? Or do they know i change the screen some how?

It shouldn't. I'd check your brightness setting and turn it down. That should help.