After having 2 HTC phones, I haven't been happier with the battery life with a stock battery than I have with the S4. I am a light to moderate user, and it wasn't unusual for me to go plug it in at night with >50% of the battery remaining with Power Save Mode ON. After the 4.3 update, I am routinely down at 30% and sometimes down around 15%. Again, with light to moderate use. I'm surprised to see no other threads on here about this topic. I'm trying to avoid a factory reset. Any ideas?