I've had a problem with my iPhone5 battery holding up for a whole day for a while now. I think a lot of people have had their iPhone5 batteries go bad. It's gotten increasingly bad over the past few months, but it's been out of warranty.
The repair went just fine. The old battery was hard to get out, but once it was out the process was a snap.
My phone is back and holding a charge better than ever!
I did not remove the screen fully. I just held it up at a 90 degree angle for me to dig in and do the work.