Phonak Audeo P Series User Manual page 62

The dome should be changed every three months or when it
becomes stiff or brittle. This is to prevent the dome from
detaching from the tube spout during insertion into or
removal from the ear.
When you are not using your hearing aid, leave the battery
door open so that any moisture can evaporate. Make sure that
you always completely dry your hearing aid after use. Store
the hearing aid in a safe, dry and clean place.
Do not drop your hearing aid! Dropping onto a hard surface
can damage your hearing aid.
Always use new batteries for your hearing aid. In case a
battery is leaking, replace it immediately with a new one to
avoid any skin irritation. You can return used batteries
to your hearing care professional.
62