So here is the situation. I bought the extended battery on Sunday. Used the phone until it got to about 10%. Gave the phone a full charge Sunday night into Monday(roughly 11 hours). Installed the Battery Left app, that showed me that I had 18 hours of full charge!!! I was impressed. Used the phone for over a day with out having to plug it in. Then...Tuesday, the phone was giving me major issues when I started it up. I did a factory reset on it. Charged the phone, woke up and now Battery Left is telling me I have 9.5 hours on full charge. This has been going on for 2 days with teh same results. Question is...Do I have a bad battery? and What else is suggested?