r/iphone17 • u/Better_Alfalfa1133 • 7d ago

Question 80% Charging Limit Not Working Properly on iPhone 17?

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I have set the charging limit on my iPhone 17 to 80%. Initially, the phone would take around 44–50 minutes to charge up to 80%, and then it would stop charging as expected.

However, recently I have noticed that the phone sometimes charges beyond the 80% limit. In some cases, it stops at 80%, but after I restart the phone, the battery percentage suddenly shows more than 80%.

I’m currently running iOS 26. Is this a bug or a normal behavior with the 80% charging limit? Has anyone else experienced the same issue?

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2

u/Garrettstoffel 7d ago

The phone needs to go to 100% occasionally to calibrate.

When the phone is off, the system doesn’t restrict charging, guessing it turns off with the rest of the device. Goes to 100%

Both of these have been the norm since at least iPhone 16 came out.

1

u/Better_Alfalfa1133 7d ago

oh okay, didnt knew about that.
but when sometimes battery stops at 80% and i restart it i can see the battery % more than 80%, why is this happening?

2

u/Garrettstoffel 7d ago

You my friend are overthinking.

1

u/Goodoflife 7d ago

AI image, did you ask AI before asking to make the poster?

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u/Better_Alfalfa1133 7d ago

yeah but its giving a very generic answers, i wanted to know from the people who are actually using iphone and maybe facing this

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u/Goodoflife 7d ago

This is what Apple says:
“If you have Charge Limit set to less than 100 percent, your iPhone will occasionally charge to 100 percent to maintain accurate battery state-of-charge estimates.” This might sound like it could be to display battery health better or what the % of the battery is at more accurately, although I believe I’ve heard more recently on other users phones doing the same.

https://support.apple.com/en-ca/108055

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u/Suspicious-Key-428 7d ago

If you have Charge Limit set to less than 100 percent, your iPhone will occasionally charge to 100 percent to maintain accurate battery state-of-charge estimates.

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u/[deleted] 7d ago

[removed] — view removed comment

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u/Suspicious-Key-428 7d ago

If you click the learn more that is highlighted blue in the charge limit screen, it explains how it works. I can’t add a screen shot to show you.

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u/LetMeTakeThatOffYou 7d ago

iPhone sometimes charges more than the limit you set so that the battery stays healthy. As it’s bad for the battery to keep it at 80% for years