Does iPhone support bypass charging with a charging limit?

It’s true that the iPhone’s main power rail for the system (CPU, display, radios, etc.) is tied to the battery. The charging circuitry is just the control and conversion path that moves energy into and out of the battery. So in a hardware sense, you can say the system “runs off the battery” rather than directly off the charging circuit.

Here’s how it works, as explained to me by an Apple Store Lead Genius with about 20 years experience.

The iPhone will run primarily off the wall charger. It will fast charge to 80% (generating a lot of heat) and stop charging if the iPhone gets too warm or it reaches it’s optimized charging limit. At that point the device has been primarily running off the charger but supplementing with the battery, if needed, during high energy demand periods.

Slow Charging may resume to 100% if the device cools enough to support continued charging. If you have optimized charging enabled, charging will resume so device is at 100% near the regular wake up time.

When the iPhone is connected to a charger the external power supply is the primary source of power. The phone draws as much as it needs from the external supply. Any extra goes to charging the battery. If the external supply can’t meet demand, the battery supplements.

So the phone does not simply ignore the charger and run 100% off the battery while plugged in. The charger is supplying power to both the device and the battery; the battery is just in the path, storing and releasing energy as needed.

This type of usage does not in itself cause damage to the battery. Any damage would be caused by excessive heat. I’d recommend getting an iPhone cooler that attaches via MagSafe or a clamp and has a Peltier element for active cooling, if you’re making a regular habit of this.

Does iPhone support bypass charging.....

I can find nothing in Apple's product specifications about this. Are you perhaps thinking about a product feature from another manufacturer?

To be clear, are you asking if an iPhone can draw power from a power adapter and bypass the battery to directly power apps, etc that might be running on the iPhone?

If this is what you are asking.....the answer is "no".

So, a Charge Limit.....whether it was enabled or not on the iPhone.....would not be relevant to your question.

In other words, it appears that your question.......Does iPhone support bypass charging with a charging limit?.......assumes that the iPhone supports what you call "bypass" when it does not.

Or, maybe I'm still not really understanding what you are asking. Might that be the case?

Is the same true for iPhones?

There is no mention of a "bypass" feature in any of the specification sheets or product guides that I've seen for the iPhone.

I also cannot find any documentation regarding a "bypass switch" in the settings on a Mac or an iPhone.

I do know that the laptops use some "intelligence" once the battery is charged, but I don't know exactly how this works. My understanding is that once the battery is charged......charging stops and the system runs off of AC power.

Aplesiespi wrote:

Hello, fellow  community! I would love to ask a question about iPhones and their batteries.

Is it true that iPhone’s can work on “Bypass Charging” mode just like Laptops if we set a dedicated charging limit? Like is it possible to use our devices like this while it’s limited to 80-85% but also with a charger still connected to it.

I would appreciate any kind of answer to my question and would like to thank to those who’s going to answer this.

You can use your phone while it is connected to a charger. You may want to monitor what you're doing while it's charging. Charging can create heat. Using the phone to do battery intensive things like playing video games, or streaming can add more heat.

Please define what you mean by bypass charging? This is not a defined charging state or method as defined by Apple. Rather than give blanket statement that may or may not be 100% accurate, I’d rather address your specific concerns.

I don’t see any specific documentation anywhere, but it is almost certain the iPhone does NOT work in that manner. In fact, its obvious it really isn’t designed for using while plugged in.