Battery alarm for a hearing aid, a hearing aid and a method for the use in a battery alarm

A hearing aid having a battery alarm, said hearing aid comprising:

• means for preventing said alarm from turning on during a predetermined warm-up time after a power supply to said hearing aid is turned on,
• a detector for detecting when a supply voltage for said hearing aid drops below a predetermined threshold value after said warm-up time;
• a first counter for counting the number of times said supply voltage falls below said predetermined threshold value within a detecting interval;
• means for setting a first alarm flag if said number of times reaches a first predetermined value within said detecting interval, and setting a second alarm flag if said number of times reaches a second predetermined value higher than said first predetermined value within said detecting interval;
• first checking means for checking the states of said first and second alarm flags;
• means for giving off an alarm if either said first or second alarm flags is set;
• and
• means for suspending new alarms for a first predetermined time period if the alarm is given off in response to the setting of said first alarm flag, and suspending new alarms for a second predetermined time period shorter than a first predetermined time period if the alarm is given off in response to setting of said second alarm flag.

A method for operating a battery alarm of a hearing aid, said method comprising the steps of

• a) detecting at least one of first and second battery voltage anomalies;
• b) giving off an alarm if either one of said first and second anomalies is detected;
• and
• c) suspending new alarms for a predetermined delay time period after said alarm is given off, at least part of said predetermined delay time being after the given off alarm has ended, the duration of said predetermined delay period being dependent at least in part on which of said first and second battery voltage anomalies was detected.