There are 3 iphone 7 in my house. Two were bought on launch, mine is the newer with 4 months old. The thing is, I used a battery life app the day I got it, and it was 100%, and wear level nowi is 97%. The other two iPhones 7 are older and are still at 100% I use the 12w iPad charger to charge my phone, the other iPhone 7 are being charged with the standard 5w charger. Is this relevant? Is the iPad charger killing my battery or I might just have a defective one? Anyone here charging their iPhones with the 12w charger and still have a perfect 100% wear level?