User level: Level 1 (4 points)Telefonuma şarj sınırı koyduğumda, örneğin %80, ve şarj seksene kadar dolduğunda by-pass olarak mı devam eder? Yani, o andan itibaren batarya aradan çıkar ve telefonun ihtiyaç duyduğu güç şarj cihazından mı karşılanır?
When I set a charging limit on my phone—say, 80%—does it switch to a bypass mode once it reaches that level? In other words, does it stop drawing power from the battery and instead source the required power directly from the charger?
Posted on Sep 18, 2026 3:28 PM
User level: Level 9 (64,078 points)Sep 18, 2026 3:47 PM in response to -nebukadnezar
Yes, and if the charger can supply the needed wattage, current is only fed to the battery to maintain the optimized charge level. If greater wattage is required than charger can supply, battery supplements the charge to supply necessary wattage. All this managed by the Power Management Unit.
User level: Level 9 (64,078 points)Sep 18, 2026 4:10 PM in response to -nebukadnezar
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 (PMU) is just the control and conversion path that moves energy into and out of the battery. So in a strict hardware sense, you can say the system “runs off the battery” rather than directly off the charging circuit.
But the charger does supply power when connected. 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. Once the battery reaches the optimized charge level, it basically acts like a conductor for the energy and the battery is minimally chemically aging. Heat production also stabilizes because the chemical reaction has reached an equilibrium.
Battery “chemical age” (the real wear factor) is driven by the following, heat, especially sustained high temps above 95°F. Number of full cycles, roughly 1,000 cycles to ~80% capacity under optimal conditions. Time, batteries slowly age even with light use Extreme charge states kept for long periods always at 0% or always at 100% in hot environments.
The act of “charging while using” is not itself a major stressor. The phone’s PMU manages current and voltage, and when the battery is full, charging essentially stops or goes to very low trickle to maintain 100% or optimized charged level.
User level: Level 10 (148,617 points)Sep 18, 2026 6:04 PM in response to -nebukadnezar
In a desktop system with no battery, large capacitors are added to smooth out ripples in the DC power.
In a battery-powered device, that smoothing is done by connecting everything to the battery.
So the battery is connected to internal power at all times, and the battery is not a separate repository that is drawn down only at certain times.
When the power adapter is connected, power adapter power is plentiful, so that is what will be used to power the device. Connected to power is not necessarily charging. The logic inside your device is what decides when to do a battery charge cycle.
But if you did really intensive work, even with the power adapter connected, the device could conceivably also 'borrow' power from the battery.
User level: Level 10 (105,996 points)Sep 18, 2026 3:47 PM in response to -nebukadnezar
No your phone is always going to use the battery as its source of power. There is no bypass mode. When necessary to keep the battery at the charge limit, it will proceed to draw power to charge the battery.
User level: Level 1 (4 points)Sep 18, 2026 5:07 PM in response to Jeff Donald
You said 'it basically acts like a conductor for the energy'
So, can we say that the energy coming from the cable flows directly through the battery? Or does the battery drain and then start charging again? Or—let me just ask exactly what I’m wondering—is it a good idea to use the phone while it’s charging in this situation?
Originally posted at discussions.apple.com/thread/256360065