Does iPhone burn battery or use external power when charging?
I'm worried about conserving charge cycles. Will it save battery life span if I use it while charging or does it not switch to external power.
Added (1). Understood, will it help save charge cycles if i keep it charging so it only requires trickle charge, or is it the same if i drain it below half power and recharge it?
Regardless of whether you charge or not iphones use power from the battery only. This is no provision for them to switch over to external power once you start charging it.
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