My i5 would not last the day on a single charge. I could sit and watch it drop at times. I'd go from 100 percent to 65 percent by lunch with hardly any usage at all. I turned off my wifi and now the phone will hardly lose any charge overnight at all. I went 36 hours before it hit 12 percent with decent usage and only turning on the wifi to tether for 15-20 minutes a few times. I even have ask to join networks turned off. Anyone else with poor battery life seen a difference with wifi? I figured it was going to do more with LTE but that does not seem to be the case. I also find tethering pretty much useless, I'm constantly having to restart the phone, or shut off/turn on the wireless and reconnect to get anywhere for more than 5-10 minutes at a time.