So an actual timepiece does it even work that well? Or if someone forgets to put it on the charger do they find out that they have idea what time it is because their watch/phone/thing died. Or does it have a reserve power to keep its primary function as a watch active?
Yes, it has a 3-day reserve to continue basic clock functions.
We’re at the point cell phones were: shock that one might have to recharge the device daily, soon followed by complete acceptance of the fact because the tradeoff of daily recharging with huge functionality is worthwhile.