My phone is usually at 100% when I wake up and by 10.30am it needs to be recharged!! Apple has admitted that there are issues with some iPhones which suffers shorter battery life (based on this article from Soyacincau.com).
First you need to check if your phone is eligible for a replacement (check here). If you are then it starts today!!!
Back in April, Apple has also acknowledge problems with power/wake button which my phone ALSO suffers from. Luckily my phone is eligible for both to be replaced so I am taking in my phone next week!
If you do take your phones in, DO follow the instructions on soyacincau's webpage OK? (ie back up etc)
I guess with fierce competition from Samsung and other phone companies, Apple are now REALLY taking care of their customer with their free replacement programs. THANK GOD for competition!! Good news for us consumers!!