Hi, how many had decided that was going to stay with Xperia Arc? I was from Xperia X10 to my current Xperia Arc (been using it over one year) and the original battery performance become dreadful so I already change an extra battery from mpj squeezed some extra juice and own another spare battery. My use one day: I usually get up at 7 a.m. Battery at 100% after charging through night. Since then I've been watching some videos and webs on my way to work and at work, checking and syncing my Twetter, email and facebook several times, responded to a few. I've also texting and received some messages. My phone call usually short, I've been turning Bluetooth, GPS and Wi-Fi off while no need for them. I'm usually at 70% at midday. Plz keep it in mind, battery longevity is around one year, than most batteries start to lose some capacity. For me, with new batteries, I am still happy with this phone! Not gonna upgrade!