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Comment by pwagland | Hacker News Reader

The challenge, at least for those that want to use the watch for sports, is not the "daily" use, but that the watch runs out of juice so quickly when using its location tracking, aka GPS sucks battery.

So, the reason that I want longer battery life is not, per se, to charge once a week, but so that I can use it on a longer run, and not be afraid that the battery will give out as I get close to the finish line.

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Without any special preparation my apple watch will last a full day of hiking while recording the GPS/heart rate/etc. (i.e. 5-7 hours hikes in the mountains.)

Cellular, on the other hand, can drain the watch relatively quickly. Mine lasts 2-3 hours when streaming music from the cloud and relaying to bluetooth headphones during a workout (i.e. when it can't piggy-back off the phone's cellular.)

would be nice to reverse-charge from phone to watch - is this possible?

The S10-line from Samsung has that feature so it's certainly not impossible

There was speculation when the 8/X came out that they would have that feature. I would love it. Too many times, I have forgotten to charge my watch in the morning and only remember when I go to to run errands and see it in red. It’s not like you can just plug it into a lightning cable in the car and top off. I refuse to get a watch charger just for the car.

That's not possible (and probably ill advised as the watch will usually outlast the phone) - however it is possible to charge your devices from an iPad.

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