There are long, long and too long discussions about this so I will not do that and simply answer yes. Faster charging can impact battery lifespan so that's a given. For Apple, I'd stick with Apple's own chargers if you want to stay inside their often protective system.
I’ve just got a new iPhone 7 and while I am loving the transfer from Android, the battery backup and charging time are irksome.
I looked around some and realised that 12W chargers work much better than the 5W one supplied with the phone.
So I was planning to get the Anker 12W charger -
instead of the more expensive but not necessarily better quality iPad one.
However, I wonder if there may not be a method in the madness in the decision to supply a 5W charger? Does this not ensure a much longer lifespan of the battery, especially since a lot of users keep their iPhones for more than 3 years. Or are there other reasons such as cost for this decision?
So I am wondering if I may end up negatively effecting the lifespan of the phone’s battery by shifting to a 12W charger?