If the temperatures are cold in the night, make sure you sleep with your batteries, phone and camera.
The cold can quickly drain a battery.  If the temperatures are cold in the night, make sure you sleep with your batteries, phone and camera. You do not want to risk missing out on your pictures in Base Camp or on Kala Patthar because you let your batteries get cold and loose power.  Keep you batteries/electronics warm by sleeping with them in your sleeping bag or wrapped up in your down jacket throughout the night!