Question: Can you change a hearing aid battery on Shabbat? I read on this site that itís okay to carry crutches outside of the Eruv if you canít walk otherwise without them. So shouldnít you also be able to change the battery if you canít hear otherwise without it?
Answer: Carrying on Shabbat is permissible even without an Eruv if the item is in a way part of your body or an essential need (under certain circumstances) - like clothing, that's the reason crutches are permissible in the above case, itís not that the laws of Shabbat do not apply to disabled people. Changing a battery is an electronic action that is prohibited on Shabbat for the connecting of the electric circuit in the device.