Cut down your carbon footprint with a solar watch that doesn't need a battery. Save money by never having to replace the batteries and buy a watch that runs on solar energy. How do solar watches work ? - Solar wristwatches work by powering the watch through direct light via the solar panels which recharges the battery giving the watch a very long lifespan. We have a great range of mens solar watches including analogue and digital solar watches at bargain prices.