A new battery will keep your hearing aid powered for between three to ten days before it needs to be replaced. Its lifetime depends on the style of hearing aid you have, and how you use it. When you need to change the battery, you may hear a few short beeps.
Once you have inserted a fresh battery, your hearing aid will start up as soon as you close the battery drawer. Then, your hearing aid may whistle while you hold it in your hand, so put it on immediately. To make your batteries last as long as possible, turn your hearing aid off when you aren't using it by opening the battery drawer.
Certain makes and models of hearing aids can use rechargeable batteries.