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How long does Apple Watch take to charge?

How long and how much power does it take to charge Apple Watch using a Chargebus 1650 multi charger?

It took around 3 hours to fully charge the 42mm Apple Watch from a completely drained state to a fully charged state. With the power current peaking at 0.36 Amps. This is a third of the power that the iPhone uses to charge.

However, Apple watch continued to charge at a low 0.1 Amps even after being fully charged. This is why Apple watch can still feel warm to the touch after an overnight charge.

Apple Watch charging power over time.
Apple Watch charging power over time.