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The correct answer highlights a significant shortcoming of completely-in-canal (CIC) hearing aids, which is related to their small batteries. Due to their compact size, these CIC devices are often equipped with smaller batteries that have limited capacity. This can lead to more frequent battery changes or recharging, which can be inconvenient for users.

Smaller batteries are generally unable to hold a charge for as long as larger batteries found in larger hearing aid models, which usually boast longer battery life. Users may find themselves needing to replace or recharge their hearing aids more often, affecting the device's usability and the user's experience.

The other options present characteristics that, while they may be true, do not fundamentally describe shortcomings of CIC hearing aids in the same way. For instance, while they may be expensive compared to other options, many hearing aids in various styles can be similarly priced depending on technology and features. Additionally, their invisibility is often a significant benefit rather than a shortcoming, and with respect to directional microphones, most modern devices—including CICs—can still utilize this feature effectively, countering the assertion that they cannot be used with them.