I bought nexus 5 just 3 days back, and I am not at all happy with the battery life. Even though I didn't talk, text or used the phone more than 30 minutes, the battery doesn't last for even a day! My 3.5 year old galaxy nexus has a better battery life than this. Is it possible to exchange the phone?
You have 15 days to exchange the phone so if you only got it 3 days ago then yes you can gladly exchange it for a different model. Keep in mind that the next phone you get will be 15 days less the time you had the first phone if your not happy with that one either, so 12 days you can exchange, it doesn't start another 15 day exchange period with the new phone.