3rd party chargers won't have a problem as the current is controlled by the controller in your iphone. Hence why you can leave your phone to charge overnight and yet it doesn't explode. The controller knows that the battery is full and stops charging. Likewise, it will limit the current from the chargers. Sometimes, getting 3rd party chargers that support higher amperage decreases charge time while not damaging the phone in any way.
u are wrong. i read an article bat apple use. the lightning cable will detect which device u are using and control the current from there as well.
by increasing the current to allow the phone to charge faster is not a wise way. if that works, y not apple just give us a 10v charger instead of 1.5v(i think so)? chragge time will be greatly reduce.
there are reason why they are controlling the voltage input.
those for third party does not control the current and damage ur phone batter.
this was from some IT website. so i think is quite reliable.