I tried very hard to keep my battery healthy by only charging my phone to 80%, which resulted in me running out of battery quite often throughout the day, interrupted charging cycles etc., which apparently all were worse than just charging to full (via "optimized charging" which finishes the charge in the later hours) overnight.
I lost about 10% of reported battery health that way in less than a year, switched to just charging overnight or whenever getting close to empty, and have lost all of 3% over the second year of using this phone.
On top of that, swapping an iPhone battery is annoying, but having to worry about all of those battery health concerns is much more tedious.
Very cool experiment.
Anecdotally, very happy with a 2018 Oneplus 10, the 80W charger charges it to full in 20min. Will never get a slow charging phone ever again.
My phone has a mode that will charge it slowly overnight during set hours but unrestricted charging during daytime, feels like the optimal solution
So the answer is yes, but not to a noticeable amount. Don't worry about protecting your battery life, and charge your phone as needed.
My anecdata fully supports that conclusion.
I tried very hard to keep my battery healthy by only charging my phone to 80%, which resulted in me running out of battery quite often throughout the day, interrupted charging cycles etc., which apparently all were worse than just charging to full (via "optimized charging" which finishes the charge in the later hours) overnight.
I lost about 10% of reported battery health that way in less than a year, switched to just charging overnight or whenever getting close to empty, and have lost all of 3% over the second year of using this phone.
On top of that, swapping an iPhone battery is annoying, but having to worry about all of those battery health concerns is much more tedious.
My understanding is that battery degradation is not linear with time.