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.
1 If your cat has patches of hair loss or inflamed areas that are very itchy, especially on the head and neck, it may have mange. 2  Mange is caused by a tiny mite.  While many cats have some of these mites, if they are in good health, the mites usually cause no problems.