Today I have by accident thrown a AAA battery into a bucket of water. I fished it out of the water immediately (within 20 seconds or so) and nothing notable had happened and the battery is still full according to a battery test device.
Cats Scratching Ears with Parasites. If this is not the issue, then it may be related to parasites alone. Check your cat's ears for signs of ticks, fleas, and mites. These parasites can cause obsessive scratching, as the cat makes a desperate effort to relieve pain and discomfort. If your cat is not allergic, try using natural tick or flea repellents (or mite repellent) if that seems to be the issue.
Your cat can also accumulate dirt in his or her ears, causing discomfort and itching. To relieve this, have your cat's ears cleaned by a veterinarian. We pet lovers have this issue too, and we need regular ear cleanings as well. When an animal's ear has gone too long without being clean, they can develop infections and blockages.