There are two potential paths to take for a watch that doesn't have to be charged. The first is an "automatic" watch with an generator spun by the motion of an eccentric-weighted rotor (itself moved by the motion of the wearer's arm). The other approach would be using a watch cell battery, which would offer a much longer battery life than a rechargeable lithium-based battery. Swatch makes watches in both cell batteries and automatic quartz varieties.
