Isn't rapid charging bad for batteries??
The longer you charge the battery, the longer it will work. Once you use faster charging, the number of total charges drops drastically. If a typical 2500mah battery lasts about a year - year and a half before it starts to deteriorate, a battery that is often being rapidly charged should show signs as fast as 6-8 months and by 2-year mark it should be near worthless. It's all good for phones which have an option to change the battery,but most new phones, including Galaxy S6 don't even have that! So you spend $1000 for a phone and it will go dead within 2 years.