Here are a few things you can do to prevent your battery from dying quickly:
- Keep it warm. If in an exposed pocket your battery will cool quickly and your phone may well shut down and restart again once the temperature improves.
- Have a booster. They're not cheap but they may well be a worthwhile investment - if you're phone can't do a few hours on the slopes it will probably struggle to do a day in the office as well.
- Quit other apps. Double tap your home button and swipe up on other apps to prevent them from using your battery in the background.
- Turn off Bluetooth and WiFi. Swipe up from the bottom of the screen and tap the icon - nice and easy.