Then......good news, you don't have to do this with this one! If you use it as a watch, and only use the fitness functions sporadically, then it will work forev

Then......good news, you don't have to do this with this one! If you use it as a watch, and only use the fitness functions sporadically, then it will work forever just off solar power, like any solar powered casio for the last 20 years.