No matter what charge level the battery was at, phone would just shut down. Could not restart phone with out putting a charger on it. Apple store wanted way too much to replace battery and ATT wanted a 2 year contract for a 99 cent replacement phone. Did not want to get stuck with contract with IPhone 5 coming out before 2 years was up. Needed a GOOD solution. Found a GREAT one with Ifixit.
I got my kit at 5pm and by 5:30 job done and phone works like new again. The guide was so well writen and the photos so helpful in visualizing the instructions that anyone can complete this repair.
Unless your IPhone is under warranty Ifixit is place to go for replacing your battery.