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Jim1Gunn
User level: Level 1 (4 points)

Physical mechanism by which battery charging is halted when a charging limit has been set - does anyone know?

I understand how to set up the battery charging limits, but my question concerns the actual method that Apple employs to halt the charging process. Since the phone is still plugged in, what actually stops the charging from proceeding further than the set limit?

Posted on Sep 18, 2026 12:21 PM

2 replies

WheelieNick
User level: Level 9 (74,110 points)

Sep 18, 2026 12:44 PM in response to Jim1Gunn

When you set a charging limit on your iPhone, the process of halting power to the battery is controlled entirely by internal electronics, specifically a dedicated Power Management Integrated Circuit (PMIC) and MOSFET switches.



Jim1Gunn Author
User level: Level 1 (4 points)

Sep 18, 2026 3:44 PM in response to WheelieNick

Great, thank you.

Originally posted at discussions.apple.com/thread/256359985