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You're likely right here. It's true though, inductive charging isn't nearly as efficient. I imagine the induction must be the current bottleneck when it comes to charging the watch, rather than the power supply (obviously) or the charger within the watch?
Remember Apple forces all iDevices to boot up when charging allow them to check to see if the Lightning or in this case the puck is an approved source. One way to check this is the following.

  • Have :apple:Watch on wOS 2.2 and run dead (won't boot)
  • Place on Series 2 puck and see if Apple logo appears
  • If so then it is charging and will only quit charging when the :apple:Watch boots up
 
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