Tick tock splash
Forget trying to find solar-powered batteries for your clock. This cool little time-keeper by Bedol is powered by tap water. Pour it into the tank, add a pinch of salt and a little lemon juice (if you have it), and it'll run 'til the H2O evaporates.
It's all done with electrodes, which harvest energy from the water. All you have to do is change the water every once in a while. While you're doing so, the clock's memory saves the time until it's full again. Now how about a water-powered car? RM