The best way to dry hearing aids is to place them in a dedicated drying device overnight, either a passive desiccant jar or an active electronic dryer. Moisture is the single biggest threat to hearing aid longevity, and a consistent drying routine can prevent the corrosion that causes most hardware failures. Whether you’re dealing with daily sweat buildup or a full submersion emergency, the approach matters.
Why Moisture Damages Hearing Aids
Hearing aids pack sensitive electronics into a tiny shell that sits in one of the dampest environments on your body: the ear canal. Sweat, humidity, condensation, and the occasional rainstorm all introduce moisture that triggers corrosion on internal circuits. Research on hearing aid failures in tropical climates found that microphones are the most vulnerable component, with the highest failure rate from corrosion. Multiple types of corrosion can develop, including electrochemical migration between circuits and galvanic corrosion where different metals meet.
Battery leakage compounds the problem. Zinc-air batteries can leak potassium hydroxide electrolyte, which is alkaline and corrosive. Combined with the salts in human sweat, this creates an aggressive chemical environment inside a device smaller than your thumb. Regular drying isn’t just good practice; it’s what keeps your hearing aids working for their full lifespan.
Two Types of Drying Devices
Desiccant Dehumidifiers (Passive)
These are small jars or boxes containing a chemical drying agent, usually silica gel beads. You place your hearing aids inside, close the lid, and the desiccant absorbs moisture from the air around the devices. They don’t need power, making them portable and simple to use. They’re ideal for nightly drying after a normal day of wear.
The tradeoff is maintenance. The desiccant material loses its absorbing ability over time and needs to be recharged or replaced every few months, depending on how humid your environment is. Many silica gel products change color when they’re saturated (typically shifting from orange to clear, or blue to pink), which tells you it’s time to reactivate them. Some brands can be reactivated in a conventional oven; others need full replacement.
Electronic Dryers (Active)
Electronic dryers use fans, gentle heat, or UV light to actively remove moisture and kill bacteria. They plug in or run on batteries and typically complete a drying cycle in a few hours. Some models combine heat with UV-C light for disinfection.
These are the better choice when your hearing aids have been exposed to significant moisture, like being caught in a downpour or accidentally submerged. However, if you use rechargeable hearing aids, be cautious with heat-based dryers. Manufacturers generally recommend that drying temperatures stay between 80 and 85°F for rechargeable instruments, and should never exceed 95°F. Excessive heat can degrade lithium-ion batteries. A passive desiccant dehumidifier is often the safer option for rechargeable models unless the electronic dryer is specifically rated for them.
Nightly Drying Routine
The simplest habit that protects your investment is drying your hearing aids every single night. Before bed, turn off your hearing aids and open the battery door (if they have one). Opening the door lets trapped moisture escape and stops the battery from draining. Wipe the exterior with a soft, dry cloth, paying attention to the microphone ports and the sound outlet. Then place them in your drying device with the battery door open.
For rechargeable hearing aids without a removable battery door, wipe them down and place them in a desiccant jar or a low-temperature electronic dryer. Some newer charging cases include built-in drying functions, so check whether yours already handles this step.
If you live in a humid climate, sweat heavily, or work outdoors, nightly drying becomes even more important. You may also want to keep a small desiccant pouch in your hearing aid carrying case for midday use.
What to Do If Your Hearing Aids Get Soaked
If your hearing aids fall into water, every second counts. Here’s the sequence:
- Retrieve them immediately. The less time submerged, the less moisture reaches the internal circuits.
- Turn them off. Power running through wet electronics accelerates short-circuit damage.
- Rinse if needed. If they fell into saltwater, soapy water, or anything dirty, rinse them briefly under clean fresh water first. Salt and minerals are more corrosive than clean water.
- Open the battery door. This lets water drain out. Remove the battery entirely and dry it separately.
- Shake gently. With the battery door open, give the hearing aid a few gentle shakes to push trapped water out through the opening.
- Dry the exterior. Use a soft, lint-free cloth to absorb all visible moisture from the surface, battery compartment, and battery contacts.
- Place in a dryer. Use an electronic dryer if you have one, since active drying is more effective after full submersion. Otherwise, a desiccant jar works. Leave them overnight at minimum.
Do not try to turn the hearing aids on until they’ve dried for at least several hours. Powering on a still-wet device can cause permanent circuit damage.
Methods That Will Damage Your Hearing Aids
A few common “quick fixes” can make things worse. Never use a hair dryer, oven, or microwave to dry hearing aids. The heat from these sources can melt plastic housings and destroy internal components. Even a hair dryer on its lowest setting produces temperatures well above the 85 to 95°F safe range for hearing aid electronics.
Rice is another popular suggestion that doesn’t hold up. Uncooked rice is a poor desiccant compared to silica gel, and the fine starch dust it sheds can clog microphone ports and sound outlets. A proper desiccant jar costs under $10 and works far better.
Understanding Your Hearing Aid’s Water Resistance
Modern hearing aids come with an IP (Ingress Protection) rating that tells you how well they resist dust and water. The rating has two digits: the first indicates dust protection (0 to 6), the second indicates water protection (0 to 9). A higher number means better protection.
Most current hearing aids fall in the IP67 or IP68 range. An IP67 device is fully dust-tight and can survive temporary submersion in water up to about 3 feet deep. An IP68 device handles continuous submersion at greater depths, though the exact limits vary by manufacturer. Devices rated IP66 handle water jets but not submersion.
These ratings describe what the device can survive, not what it’s designed for. Even IP68 hearing aids aren’t meant to be worn swimming or in the shower. Seals degrade over time, and repeated water exposure wears down protection that was tested under controlled factory conditions. The IP rating is your safety net for accidents, not a green light for water exposure. Consistent drying remains essential regardless of the rating.
Choosing the Right Dryer
For most people, a simple desiccant jar is all you need. It handles everyday moisture from sweat and humidity, it’s silent, it’s portable, and it costs very little. Replace or reactivate the desiccant beads when the color indicator tells you they’re saturated, typically every two to four months with regular use.
An electronic dryer makes more sense if you sweat heavily during exercise or work, live in a tropical or very humid climate, or want the added benefit of UV sanitization. If you wear rechargeable hearing aids, look specifically for a dryer that stays within the 80 to 85°F range, or stick with a passive desiccant system.
Whichever method you choose, the key is consistency. A drying device only works if you actually use it every night. Making it part of your bedtime routine is the single most effective thing you can do to extend the life of your hearing aids.