How to test your battery
If your hearing aids turn off, you may wish to check if the battery has run out. There are two common ways to check this:
With a battery tester
Place the battery on the battery tester surface. Ensure that the positive (+) marking is facing upwards. Slide the battery in the direction of the arrow and read the result on the display.
Without a battery tester
Insert the battery in the hearing aid and close the battery door. Close your hand around the hearing aid and hold it up to your ear. If the hearing aid is squealing, the battery is functioning.