There are many ways to charge your phone - wall charger, car charger, via USB port or power bank. But how powerful is the charger? What if your charging power doesn't even meets the values that it should have? Test your charger now with Ampere!
Ampere is an amazing and free app (with beautiful design!) that measures the charging current of the battery.
It is great for measuring and checking what charger is the best option for you. If you're using some kind of un-official charger, you may not even meet the listed values and charging your phone with this may be really really slow.
Try and see for yourself!