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iPhone 15 Pro Max Charging everyday or every other day?

CMoore515 said:
Goes on MagSafe every night, regardless of charge level. Charged to 100% with optimized charging on.

I don't baby the battery.
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I leave mine on charge 24/7 for the last three iPad pros. After two years, maybe three I get another iPad. No issues.
 
I charge my phone when it’s convenient to me and I don’t look at percentages. When battery nears its end of life I swap battery or the phone. As an example I used my iPhone XR from mid 2019 to early 2024 (5 ish years) and charged it whenever and in the end I still got one day battery life. Btw had to give that phone away because it was a work phone. Otherwise would just keep using it.
 
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now i see it said:
For all lithium batteries in all devices (or vehicles) the deeper the discharge between charging, the more stress it puts on the battery.

Example:
A lithium battery (or iPhone) that is kept at a charge level between 80% to 50% will have a much longer ultimate lifespan (in years) than if it were kept at a charge level between 100% to 20%. Or even 80% to 20%.

Bottom line. Several small charges are a lot easier on the battery than fewer big ones.
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Also worth noting is that deep discharges are MUCH worse for a battery vs. keeping it at/near 100% charged.

So if you have a choice, plug the phone in.
 
Neofox said:
... And if I planned to keep my phone for 10 years then I would simply have to change the battery once around the 5 years mark when the battery goes to 80% capacity.
...
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Those battery capacity percentages are deceptive.

When a battery gets down into the mid-80s you're going to start to see unacceptable behavior like huge unpredictable changes in charge level, etc. Like the phone saying it's 90% charged and then a minute later saying 50% for no reason.

So you're almost certainly going to want to swap the battery more often than every 5 years.
 
This is an age-old argument. Facts don't sway opposing opinions.

Charge cycles are probably the most important. Charging wattage has more effect on battery life than the 80-20 guideline. EVs are a good example. High-speed (Level 3) charging will degrade the battery faster than Level 2 (240V).

I charge my iPhone when it drops below 20%. YMMV.
 
cousintim said:
This is an age-old argument. Facts don't sway opposing opinions.

Charge cycles are probably the most important. Charging wattage has more effect on battery life than the 80-20 guideline. EVs are a good example. High-speed (Level 3) charging will degrade the battery faster than Level 2 (240V).

I charge my iPhone when it drops below 20%. YMMV.
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Why would you wait until it's below 20%. That's not ideal for the battery.
 
I charge overnight on MagSafe to 100%. I most often don’t have to charge during the day unless I’ve done some heavy video recording, so if it hits 20% anytime before bed I will charge it. I upgrade every year so I don’t pay attention to battery health.
 
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I put my phone on a Magsafe charger every night at bedtime and charge it to 100% overnight, with Optimized Charging enabled. My 13 Pro is almost 3 years old, is currently at 79% battery health, and still easily gets me through an entire day with battery to spare unless I have an unusually (insanely) heavy usage day.

If I decide to keep an iPhone for longer than 3 years (which I've never yet done), I'll pay the $89 for a battery replacement when it needs it and keep going, rather than micromanaging and obsessing over my charge percentage on a daily basis. I don't even give a thought to charging it above 80% or not letting it go below 20%.
 
azhava said:
I put my phone on a Magsafe charger every night at bedtime and charge it to 100% overnight, with Optimized Charging enabled. My 13 Pro is almost 3 years old, is currently at 79% battery health, and still easily gets me through an entire day with battery to spare unless I have an unusually (insanely) heavy usage day.

If I decide to keep an iPhone for longer than 3 years (which I've never yet done), I'll pay the $89 for a battery replacement when it needs it and keep going, rather than micromanaging and obsessing over my charge percentage on a daily basis. I don't even give a thought to charging it above 80% or not letting it go below 20%.
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Good philosophy.

Doesn't really help the guy who started this thread, though, since it sounds like charging every night or every other night is equally convenient for him. So he might as well charge every night, because it's better for the battery.

Some people in the world are under the impression that charging to 100%, or leaving your phone on the charger when it's already at 100%, is bad for the battery. It isn't. Or, it might be, a little bit, but not by an amount that's worth worrying about.

And some people are reluctant to plug their phone in until it's almost out of battery power because they're under the misguided notion that every time you plug it in, it counts as a "cycle."

So basically, all things being equal, people shouldn't deliberately do things that are bad for their batteries (or at least not good for them).

It's also a pet peeve of mine when somebody sets his phone down in a spot where it's going to get roasted by direct sunlight, like the top of the dashboard in a hot car, when he could put the phone basically anywhere else just as easily. That's also going to ruin the battery for no reason.
 
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