I have an iPhone 5s. Today, I had 90% battery life with 1 hour 10 minutes of usage on Wi-Fi. Every setting that I don't need and decreases battery life is deactivated, brightness at about 10%, as I was indoors. Then, as I had to go, I plugged it up until 100% and left. It was on Standby for around 2 Hours, until I started using it. Only difference is, that now the phone was on LTE, always with 3 to 5 bars of signal. I felt the battery was draining like crazy, until it reached 90% again, and I went into settings to check usage. Surprise, now usage time was at... 37 minutes!!! And the only difference was changing from Wi-Fi to LTE, with exactly the same brightness!! (It was at night, don't worry about my vision ) Now, I do not expect it to last the same, but half the time? Unacceptable. Is there anything I can do to change that, or it is what it is? Former or current 5s users, can you tell me how long does it last while on LTE? PS: Phone on Wi-Fi all through lasts between 7 and 9 hours with 10% brightness. The other day I used it on broad daylight and had to put brightness to 100%. Phone lasted 4 Hours 25 Minutes and was at 5%, it is really low, but well, it was max brightness, so it is what it is, but I cannot accept the previous duration.