If I might ... throw some information out there that is hopefully useful...
The 80% claim comes from battery stats from sites such as below:
Some see 80% DoD as an acceptable tradeoff for longevity and not inconveniencing the user so much (I follow this and limit my phone to 80% because it doesn't inconvenience me at all).
Not only slower charging but also keeping the depth of discharge low can have a big impact on batteries - especially as they age.
Obviously, most people are going to get a new phone every few years, and some go to 5 years - so very few people see more than 500 cycles on their phones.
Heat is the #1 factor. Keep your phone cool as much as you can (don't leave it in a hot car, don't leave it in the sun, don't use some terrible wireless chargers that bake the battery).
Yes, slow charging has an impact, but it's very minimal. Depth of Discharge has a greater impact. And keeping the battery cool probably has the greatest impact.
I've read Isidor's book (from https://batteryuniversity.com) - great book on batteries if they're a hobby of yours like they are mine.
But most people here are also right... For $99 you can get a new battery - after 2 years my wife's iPhone 15 Pro Max had 84% health. For $99 she has a 103% health battery replacement and is enjoying her phone like it is new. She's a heavy user (had 550+ cycles in 2 years) and we were using a terrible Belkin wireless charger that took her phone to 105F+ while charging (got rid of that and she now has wired).
So use your phone, don't think about it too much, keep it out of the sun/car in the summer, and you're good!
The 80% claim comes from battery stats from sites such as below:
Some see 80% DoD as an acceptable tradeoff for longevity and not inconveniencing the user so much (I follow this and limit my phone to 80% because it doesn't inconvenience me at all).
Not only slower charging but also keeping the depth of discharge low can have a big impact on batteries - especially as they age.
Obviously, most people are going to get a new phone every few years, and some go to 5 years - so very few people see more than 500 cycles on their phones.
Heat is the #1 factor. Keep your phone cool as much as you can (don't leave it in a hot car, don't leave it in the sun, don't use some terrible wireless chargers that bake the battery).
Yes, slow charging has an impact, but it's very minimal. Depth of Discharge has a greater impact. And keeping the battery cool probably has the greatest impact.
I've read Isidor's book (from https://batteryuniversity.com) - great book on batteries if they're a hobby of yours like they are mine.
But most people here are also right... For $99 you can get a new battery - after 2 years my wife's iPhone 15 Pro Max had 84% health. For $99 she has a 103% health battery replacement and is enjoying her phone like it is new. She's a heavy user (had 550+ cycles in 2 years) and we were using a terrible Belkin wireless charger that took her phone to 105F+ while charging (got rid of that and she now has wired).
So use your phone, don't think about it too much, keep it out of the sun/car in the summer, and you're good!
