More battery life would also greatly increase innovation and adoption. You shouldn't have to wonder if your watch has enough juice to last your weekend trip whe

More battery life would also greatly increase innovation and adoption. You shouldn't have to wonder if your watch has enough juice to last your weekend trip when you forget to bring the charger. Especially if the watch is meant to be a life-saving beacon. Regular quartz watches can go 3-10 years between battery replacements. Solar charging can increase that to 20 years or more. Self-winding mechanical watches will last a lifetime as long as you wear them regularly and have them serviced every now and then. How long does a modern smartwatch last in comparison?