I have an Android and carry a couple extra batteries when I'm backpacking (as well as keep it in airplane mode and not "overusing" it). I also have a backup 10,000 mAh battery than can run camp lites or charge my phone more than twice. It's my camera, GPS, video, and phone when service is available. I can sometimes text even when I barely get a signal. I now do not carry my GPS but keep one in the truck as an emergency backup.