It can't charge at 45w but it's rated at because it pulls 45w when charging while at load. If the device is at idle and you charge it will draw 30w right. Now instead of idle, play a game and plug it in, now it draws up to 45w and the extra power is sent straight to the A18 chip, while 30w goes to the battery so your phone can fast charge while you game
What Apple should have advertised is that iPhone 16 can charge faster than previous iPhones while gaming
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