Hearing aids are vulnerable to all sorts of moisture and their is no way to avoid it completely. The best you can do to care for your investment and your instruments is to maintain an up to standard level of dryness and that can be done in a number of ways.
Folks commonly asked if there is such a thing as a water-resistant hearing aid. The answer is “not any that have been effective.” Part of the reason why hearing aids persist to have moisture issues is due to the battery. The batteries in hearing aids are air initiated… that means that they need to be exposed to the air to work. If the hearing aids were totally sealed from air, the batteries would not operate (consequently, they cannot be easily sealed from water for the same reason). What’s more, if the aids are sealed and dampness gets inside the aid it won’t be able to drain back out. If humidity becomes trapped inside the hearing aid you then have battery deterioration issues and probably moisture linked collapse of the amplifier, and/or processor (or other delicate parts of the hearing aid). So, some escape of air (and water) is necessary for a hearing aid to work. Perhaps one day with sciences like Nanotechnology we will finally be able to invent a membrane barrier that will not allow moisture in but will allow moisture to escape and air in for the battery. Perhaps with improvements to the batteries (for instance the new rechargables that are surfacing) we will no longer need zinc-air battery cells for power. Some manufacturers are starting to play around with Nanotechnology and it is an interesting science. Maybe in the future buyers will see many of their concerns gradually addressed as suitable solutions are put on the market.
As for wetness deterrence solutions… To begin with, you cannot go for a dip with your hearing aids in, but if you are going to wear your in-the-ear (ITE) aids in or around the swimming pool or other potentially hazardous places, at the very least get a head wrap called EarBandit. This will also keep the aids from falling in the water. For those of you that put on behind-the-ear (BTE) hearing aids, you can also make use of the sweatband or EarGear stuff. These are not water-resistant options and you still need to keep away from getting the aids wet… but they will offer splashguard. So, you can relax a little and have some pleasure. When you are through for the day at the pool… let your hearing aids tumble dry for 8 hours prior to wearing them yet again. Open the battery gate and put in a dry, safe location. Never utilize hair dryers, heat lamps, hot air guns, microwaves or ovens to dry up the hearing aids.
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