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.
Ear mites, scientifically known as Otodectes cynotes, can cause severe itching and results in cat hair loss on the ears and head. These mites are easily transferred to other cats, and will sometimes even transfer to people although they cannot survive on humans.