I thought they ran without batteries, something to do with your body movement ?
Unlike a standard automatic watch, a Kinetic will keep time even when it's not worn. There's a backup system (a battery or capacitor) which keeps the time. If you don't wear it, the self winding movement will start running down, and the backup system keeps time. As soon as the self winder is running again, the backup system resets the watch to the correct time.
TBH I'm not sure if's a combination of an automatic movement and a digital backup timekeeper or just generates electricity to run a quartz movement. Either way, it's got a backup battery.