Beta + Rapid Battery Health Degradation

[HouseLannister]

15 on 18.0 and 15 Pro on 18.1, charged via an Anker 100W with Apple MagSafe, charged to 100% without optimization or clean energy, and they both have 100% health remaining.

 

[BigBlur]

I would find it interesting to know what type of chargers everyone is using with battery degradation. 5W, 10W, 25W, more? Does rapid charge generate more heat and cause the battery life to be shortened? (I think I already know the answer to that.)

That would be interesting, but there are so many other factors to consider as well. (i.e. have they been using the new 80% charging limit, did they use optimized charging, do they charge in a warm room or cold room, how fast are they draining the battery, what phone do they have - batteries are different between each model and generation, etc.)

I had to check the battery capacity on my three-year-old iPhone 13 and was shocked to see it was at 87%. I was honestly expecting it to be much worse considering people say wireless charging and fast charging are bad. I primarily use MagSafe charging overnight or fast charging with the 20W brick during the day if needed. I don't monitor my battery health, so don't know what the trend was. Would be cool if we could view that history though.

So I'm also curious... How are some of these phones getting down to the 80s/low 90s after one year? Defective battery? High phone usage? Bug in iOS?