There is no pleasure quite like hoisting sail, turning off the engine, and enjoying the sound of water flowing over the hull... until the low battery alarm goes off. The batteries power our basic sailing instruments and autopilot, as well as our lights after dark. The batteries on Water Music have given a full life and don't have much juice left. Being large, deep cycle, marine grade batteries, they are quite expensive. Water Music has four of them. Money contributed will replace the battery bank and update Water Music to make her more energy efficient.