TL;DW: Fast charging over 2 years only degraded the battery an extra 0.5%, even on extremely fast charging Android phones using 120W.
And with that, hopefully we can put this argument to rest.
TL;DW: Fast charging over 2 years only degraded the battery an extra 0.5%, even on extremely fast charging Android phones using 120W.
And with that, hopefully we can put this argument to rest.
Sure, if the manufacturer sets it to not charge to the max. I’m saying some manufactured charge to the max by default, hence why that setting is useful.
I think you’re leaning too much into the false assumption that “the max” is some final and definite thing.
Batteries aren’t charged from “empty” to “max”, there is no “max”. They’re charged from one voltage level to another which isn’t in a percentage value. How do you think your phone knows what percentage a battery is at?
“The max” is the highest voltage the battery can safely store with reasonable losses, and “empty” is the lowest voltage the battery can safely charge from. Or something like that, I’m not a battery engineer. There’s surely a bit of buffer here since users will use it outside of ideal circumstances (ambient temperature, heat dissipation, etc).
Regardless, those numbers come from the battery manufacturer. I’m guessing phone manufacturers add some extra buffer given the properties of the phone (heat generated by electronics, heat dissipation of the case, etc).
None of that has anything to do with what I’m talking about.
The 20-80% range is on top of that and is based on efficiencies in battery tech. That’s the sweet spot of battery longevity, and some phone manufacturers limit charging to the top end and most (all?) warn when you hit the lower bound. But not all manufacturers report 100% when it hits that upper bound of that range. Many do, but not all. Some report 80% and let you bypass it, and some don’t cap that upper bound.
Your first paragraph pretty much agrees with the grandparent of this whole thread. What constitutes “max” is something that the battery manufacturer and the phone manufacturer come up with.
You said “some do this some don’t”. It doesn’t make any sense at all. All manufacturers have to decide what 100% means. There is no some do some don’t.
Obviously not. Might as well stop at that then
The OP said “all phone ma manufacturers stop charging at 80%.” That means phone manufacturers have a definition for 80% and 100%, and they use 80% universally while showing 100%. The first part is true, the second part isn’t. Some manufacturers show 100% when it’s actually their definition of 100%, meaning charging to 80% manually on those phones has value in prolonging your battery, whereas charging to 80% manually on the phones that cap at 80% doesn’t have value.