In those times you need a source of power to charge your smartphone, you can’t exactly whip out a wall charger and start charging, because you need an outlet. If you have a car charger, are you really going to just stay in your car and wait for your smartphone to charge to an acceptable power capacity? No! That’s going to waste time. This is where a power bank comes in because you can easily begin charging your smartphone with your Power Bank when it’s low on power and that will result in constant use of a smartphone without any interruptions.