Navigation apps are battery killers, and the problem is that a long drive with the screen on, the GPS active, and the data running can drain a phone in a few hours, leaving you without a map precisely when you are farthest from home. Managing battery life is a small but essential part of any long trip, and a few habits keep the phone alive from departure to arrival.The drain comes from three sources at once, the screen, which is the biggest draw, the GPS receiver, which is constantly recalculating your position, and the data connection, which pulls maps and traffic. Running all three for hours is the worst case for a battery, and the result is that a phone at full charge can be nearly empty by early afternoon, especially if it is also streaming music or podcasts through the same device.The fixes are straightforward. Plug the phone into a fast car charger the moment you start, because a charger that delivers enough power keeps the battery full even while navigating, and a weak charger merely slows the drain.
Lower the screen brightness, since the display is the largest single
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