If the battery shows less voltage or won't take a charge, it's time to get out the hydrometer. This device checks the proportions of sulfuric acid and water in the electrolyte, which is a precise indication of the level of charge.
Common causes of cat hair loss, or alopecia, can range from allergic reactions to hormone imbalances to an infestation of some pest or another. Although the different causes can be difficult to pinpoint, most are fairly easy to address and remedy.
Ringworm, a fungal infection that humans can also contract, results in hair loss around the cat's feet, face and ears. (You'll see red circles with a white center.) If the cat has arthritis, hair loss around his joint areas is common. Much less common are glandular disorders, including Cushing's disease, that cause cats to lose hair along the sides of their bodies.