If Night Shift iPhone battery to discharge fasterIs a question that we all ask themselves, ever since this feature was launched, with iOS 9.3.
From tests completed on two devices iPhone 6We can say very safe, yes, Night Shift download the battery with approximately 20 - 25% fasterWhen it is activated.
Perhaps this was the reason why Apple, until the latest version of iOS, iOS 9.3.2 did not allow activation Night Shift with activation Low Power Mode.
After launching iOS 9.3.2, Apple allow simultaneous activation of the two modesBut if you have less than 20% battery on your iPhone and do not have a charger handy, you should not activate the Night Shift. If you still want to do this, you should set for Night Shift o less warm lightThan the default set. 50% to somewhere "less warm". Ie less warm light.
Settings > Display & Brightness > Night Shift > color Temperature
More warm, more iPhone battery drain!