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.
Usually the hair loss in cats that is caused by ringworm will be found on the face or head area, around the ears or neck, paws (especially in the nail beds or folds of skin between toes), and/or tail base. Sometimes, if the infection is bad enough, the areas can develop boils that ooze, but this is rare.