Tethering drains battery to empty even when plugged into the wall socket

Twice yesterday when tethering for a few hours my phone shut down with a flat battery even though it was plugged into a wall socket and the charging indicator was on. Can tethering use more power than the charger can supply? After shutting down the laptop, the phone charged normally.

Yes, tethering (especially via Bluetooth) can use more power than the charger can provide. That's also true of GPS navigation when connected to a car charger. In both cases, having the iPhone plugged in certainly helps, but those activities will use more power than the 5 Watts provided by the power adapter (2.5 Watts if connected to the computer's USB port), and thus drain the battery despite being connected to a power source.

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