Battery Information - Hearing Direct.com HD 350 Operating Instructions Manual

Battery
information
In fact, when the hearing aid is not in use, it is recommended that you
open the battery door and remove the battery. This helps to prevent
excessive battery drain and allows for proper ventilation of the
hearing aid.
The HD 350 is equipped with a low battery detection system, which
continuously monitors battery life.
When the battery becomes low, the low battery warning sequence
consisting of 3 double beeps is initiated. After the warning beeps are
complete, normal operation resumes.
The low battery warning sequence will repeat every 10 minutes until
the battery becomes critically low. At that time, the end of the battery
life warning sequence consisting of 6 double beeps is triggered. The
device is then muted and put into low power sleep mode.
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