Fast charging and iPhone 14 Pro battery

nr2d

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Jun 18, 2009
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I just started using a fast charger for my iPhone 14 Pro Max. As I sit here at the computer I started wondering about something, what affect does fast charging an iPhone have on it's battery verses regular/slow charging? I know Li/ion batteries have a limited charge/recharge life, I think about 300 cycles I read. So I was wonder if this charge/recharge life is affect by fast charging.
 

EdwinG

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Mar 10, 2012
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In my experience, I don’t think Fast Charging degrades the battery by itself. However, it does cause it to heat up more and — because of that — it might degrade faster. I’m saying might, because there is management software on your phone to protect the battery.

Lithium-Ion batteries hate heat (over 35°C in particular). As for cycle counts, have a look at the bottom section of this page from Apple: https://www.apple.com/ca/batteries/why-lithium-ion/#mn_p
 

Up_And_Away

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Aug 27, 2021
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As Ed7789 stated, heat is bad for smartphone batteries. However heating in the charging process is largely factored in. It is expected. When it comes to charging, just do it, a charging schedule is best (to make it easiest for the phone to optimize the charge). Then just live your life and enjoy the new iPhone without worries.
-If there is one thing to avoid, it is direct sunlight on a hot day baking your phone. My understanding is, this is worse for a battery that happens to be at 100% or 0% but the software usually avoids having 100% except at the right time based on charging habits (and your phone powers off before it hits actual zero).
-if the phone will be turned off for an extended period (a few weeks or more), charge it to 50% before powering it off. Side note: this is most specifically true of Samsung phones. Samsung phones turned off for an extended period get battery burst way more commonly than other models, shockingly substantially more often.
 

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