iPhone 16 Charge Limit Works erratically

[Mr_Knightley]

I have set my charge limit to 80%. It appears to work consistently when charging with an Apple plug and cable but I have noticed that the limit only works occasionally when using a non-Apple charging device. This morning when I looked to see if the phone had charged, it was showing 86%.

Anyone else noticed this?

 

[Puonti]

You should be seeing the described behavior regardless of the charger being used:

"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."

About Charge Limit and Optimized Battery Charging on iPhone - Apple Support

To improve the lifespan of your battery, your iPhone learns from your daily charging habits.

support.apple.com

 

[JPack]

The Apple USB-C cable is completely passive, meaning there is no chip telling the connected device anything. The device doesn’t know if it’s an Apple cable.