Ic chip that prevents overcharging.
Do you know if the fast charging wears out the battery faster over time?
Yes it has. My phone is slowly dying 3.5% a year due to fast 2 amp charging https://image.nostr.build/0b85d84e0fd9f64bc93553f8549abc98b3ffad3f0b85dbca0726568e747ea9f2.jpg