I am very sorry to hear of your Mother’s chronic pain. You mention that the pain begins in her back and that may be a clue that much, if not all, of her pain is secondary to
pressurePressure ulcer on a number of nerves, the
pressurePressure ulcer caused by arthritis of the spine or by a damaged disc. Many good arthritis drugs are now available and worth a try, some less irritating to the stomach than others.
But pain has many causes and a very
commonCommon cold cause is diabetes. You might want to ask her doctor to check on this. If the nerve irritation is from diabetes, treatment of it might relieve the pain.
You said she has the pain at night and it prevents deep sleep. One way to prevent this is for her to find a comfortable position and then set up a number of pillows to try to keep her in that position. Also, there are devices, such as one called TENS, that are said to relieve pain by electrical stimulation.
To answer your question, I very much doubt that her feeling of skin stretching when she holds the phone or TV devices is due to batteries. Much more likely to be coming from already inflamed or irritated nerves.
I wish I could be more helpful.