Hello, I've been extremely frustrated with my iPhone battery lately... The most usage I can get out of it is about 3 hours and it is almost always overheating when off of wifi. It also always dies at unusual battery percentages. One time it died at 40% when I used the flash on my camera to take a picture. I am still under my 1 year warranty. What options are available to me if I take it into an apple store to be fixed? I checked iBackupbot: The design capacity is 1430 MHz and my phone is currently at 1209 MHz. Thank you.