I have always spare battery on me (fits small pocket), and it's quite often it has its use. When I travel I always have 2 spare batteries, so I have assured ba

I have always spare battery on me (fits small pocket), and it's quite often it has its use. When I travel I always have 2 spare batteries, so I have assured battery live for long day of heavy usage (GPS navigation etc). With such option you never worry about battery drain and you can freely use your device up to maximum.