If a hearing aid sounds "noisy", what is one possible issue?

When a hearing aid sounds "noisy," one possible issue is that the battery contacts are corroded. Corrosion can disrupt the electrical connection between the batteries and the hearing aid, leading to inconsistent power delivery. This inconsistency can manifest as static or unwanted noise. Proper maintenance of battery contacts is essential for ensuring the device operates smoothly and delivers clear sound quality.

While the other options can also contribute to sound issues, they tend to involve different mechanisms. For example, a microphone that is too powerful or too much background noise may result in sound distortion or a lack of clarity, rather than simply noise. Similarly, improper fitting can lead to feedback or discomfort but does not primarily cause the "noisy" characteristic associated with corroded battery contacts. Thus, corrosion of battery contacts specifically relates to the electrical issues that directly impact sound quality.