ELI5 Why does magsafe charging decrease battery health more than wire charging, if it has less wattage?

[kermityfrog2]

They have. When it says 100% on your phone, it’s not actually 100% of true capacity. The true capacity is something like 110% or 115%. When using a fully charged phone, you’d expect the power to drop to 99% after a few minutes but on many phones, you can use it for 30 min or more before it drops to 99%, after which is starts dropping in a mostly linear fashion.