I’ve noticed this with ipads and iphones. If it’s completely drained and you plug it in, you still can’t turn it on for a few minutes. I don’t know if the battery is part of the standard circuit powering the thing or what.
In: Technology
While it would be more convenient for a user for the charging circuit to have the ability to bypass the battery and power the device directly, it is more complicated and therefore more expensive (and bulkier and heavier) to do so. With most modern electronics, when you plug them into a charger, it’s not as though the electronics are directly connected to the power source. Instead, the battery is directly connected to the power source and the device is separately connected to the battery. This has a couple of advantages, including helping to mitigate possible damage to the main electronics of the device if it’s plugged into a bad power source. But it does mean that the battery has to be charged enough to deliver sufficient voltage for the device to operate, which (depending on the design of the device and the battery display) might very well mean that it needs to be at 5% battery to turn on. The boot process draws more current, generally speaking, than simply staying on, which it very low battery might mean that the battery simply can’t deliver sufficient current to turn on but can deliver sufficient current to stay on for another few minutes.
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