I have a degenerative hearing disease called otosclerosis so my hearing changes pretty frequently. My contract includes yearly adjustments to change the amplif

I have a degenerative hearing disease called otosclerosis so my hearing changes pretty frequently. My contract includes yearly adjustments to change the amplification vs frequency curve of the aids to compensate for my personal hearing loss profile, and free batteries for 3 years (zinc-air batteries that last ~5 days).