Watts is special software that allows Mac users to check the performance of their laptop battery. The software fits comfortably onto the desktop toolbar and runs quietly in the background until it is called upon when needed, the software provides detailed and comprehensive information that allows users to determine whether or nit their battery is performing well. While Snow Leopard users are likely to find that Watts is a useful tool, people who are running Mountain Lion are likely to find that the software is incompatible.