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So, you should never charge your battery to 100% in order to protect its full capacity, which means you never get to use its full capacity anyway...

That's why Samsung puts bigger batteries in, and hides the extra capacity in the S8 and newer. Tesla gives users an option to fully charge if they're going on a road trip, but day to day, they stop charging around 80 or 90%.
 
Follow-up question:

So consensus is that the worst thing for a battery is heat. Does that mean that it IS bad to use fast-charging? I assume the iPhone gets much more hotter when using USB-C 30W wireless compared to my crappy 3rd party 5W wireless charger.
 
Follow-up question:

So consensus is that the worst thing for a battery is heat. Does that mean that it IS bad to use fast-charging? I assume the iPhone gets much more hotter when using USB-C 30W wireless compared to my crappy 3rd party 5W wireless charger.

it get hotter in theory, but you also stop charging sooner, meaning the battery spend less time being hot. it also depends on how crappy that 5w charger is.
 
it get hotter in theory, but you also stop charging sooner, meaning the battery spend less time being hot. it also depends on how crappy that 5w charger is.

When I get my next phone, most likely the Note 9, and I allow it to charge overnight, I plan on using a 5W wired charger (either from a Galaxy S3 or iPhone SE). There's just no reason to go faster on an overnight charge. Fast charging is fine in a pinch when you need the charge quickly, like when traveling, you get to your hotel and want to change and go out to dinner, a 30 minute fast charge is the name of the game.
 
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