More detail here:
Apple Invents a Portable/Wearable Battery System for Apple Watch - Patently Apple
The patent was filed in 2015. Maybe they're waiting for flexible battery tech to mature (graphene is mentioned in the patent) but I kinda doubt it.
I don't like the implementation using a wired mini-puck. There was (or maybe still is?) a third-party battery strap that uses a charging puck integrated into a sort of base to which the AW is mounted -- but it ends up being pretty bulky, too.
It's still rare that someone's AW usage might keep the watch away from recharging for too long; pretty much the only way that someone runs out of battery before bedtime is if they wear it on a very long jog or bike ride.
GPS can kill the battery if on enough. I would want thebattery strap to charge as the watch is bring charged
I'd call this another preemptive patent by Apple. They do a lot of them -- come up with an idea and formalize it in writing. I don't expect to see this on the market.
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