I am HOH, not Deaf at this point. However, I always change my hearing aid batteries on the same day every week (Fridays

). That way I don't have the gradual loss of functioning without noticing it (or rationalizing it's the environment, etc., etc.) as I can't hear the warning tones my aids make. If I forget, I don't get more than an inadequate day anyway, so I just change them regularly rather than worry about the batteries dying when I'm out somewhere. Works for me.