Treat yourself to the joy of everyday communication

The international company WIDEX has been manufacturing and selling hearing aids since 1956. We are constantly improving devices to provide optimal audibility and comfort for our customers.

WIDEX offers hearing aids in five categories:

• PREMIUM; BUSINESS; COMFORT; BUDGET; ECONOMY.

Our advantages

If you have difficulty hearing, contact the WIDEX Hearing Center - we will help you solve the problem. Our experts will select the devices that best suit your individual needs. With our help, you will regain the ability to hear all the variety of sounds.

Stylish appearance

The range of our hearing centers includes a complete the lineup devices of modern shapes and colors: miniature in-ear, elegant with a receiver in the ear, classic behind the ear. Widex devices and accessories received international design awards - RED DOT Design, Good Design, IF Design Award

Natural sounding devices

Widex makes sounds recognizable, speech intelligible, noise non-irritating through a range of patented Widex technologies - Widex amplification formula, Speech Enhancer, Low Background Noise Suppression, Inter Ear Compression, 5dB to 113dB Wide Input Range, HD Locator, TruSound Softner and other technologies.

Quality assurance

We work according to Danish Widex standards. There is full set international and Russian permits, they confirm the reliability and safety of the devices. We regularly monitor quality and user satisfaction.

All inclusive price

The cost of hearing aids includes all necessary consultations and maintenance during the life of the hearing aids. A personal specialist guides the user in the office, by phone or via online consultation on the site.

Minimum service periods

Warranty periods repairs in a certified service center Widex Moscow is 2-3 business days. We deliver devices to Moscow and back on a weekly basis at the expense of our company through Widex regional hearing centers. You can monitor the status of service work.

Comfort of use and stable work devices

Individual housings for in-the-canal, in-the-ear devices and individual inserts are made using CAMISHA Widex 3D technology. They fit comfortably in the user's ears, as they fully correspond to the casts of the ear canals. tight fit and optimal size products ensure the correct operation of the systems of the devices and the attractive appearance of the device.

Miniature air-zinc batteries (galvanic "tablets") rated voltage 1.4V is used for reliable and uninterrupted operation of analog and digital hearing aids, sound amplifiers and cochlear implants. The high environmental friendliness of microbatteries and the inability to leak ensure complete consumer safety. Our online store offers you to buy at affordable prices the widest range of high-quality batteries for in-the-ear, in-the-ear and behind-the-ear hearing aids.

Benefits of Hearing Aid Batteries

Zinc-air battery housing contains zinc anode, air electrode and electrolyte. The catalyst for the oxidation reaction and the formation of an electric current is atmospheric oxygen, which enters through a special membrane in the housing. This battery configuration provides a number of performance benefits:

• compactness and low weight;
• ease of storage and use;
• uniform charge return;
• low self-discharge (from 2% per year);
• long service life.

So that you can replace worn-out batteries with new ones in low, medium and high power devices in a timely manner, we sell batteries for hearing aids in St. Petersburg in convenient packages of 4, 6 or 8 pcs.

How to buy hearing aid batteries

On our website, you can always buy retail and wholesale batteries for hearing amplification devices from well-known manufacturers Renata, GP, Energizer, Camelion. To correctly select the size of the battery, use our table, focusing on the color of the protective film and the type of device.

Our prices are lower than our competitors because we buy directly from the manufacturer.

Long time scope air-zinc batteries did not go beyond medicine. High capacity and long service life (when inactive) allowed them to easily occupy the niche of disposable hearing aid batteries. But in last years there is a great increase in interest in this technology among automakers. Some believe that an alternative to lithium has been found. Is it so?

An air-zinc battery for an electric vehicle can be arranged as follows: electrodes are inserted into a container divided into compartments, on which air oxygen is adsorbed and reduced, as well as special removable cassettes filled with consumable anode, in this case zinc granules. A separator is laid between the negative and positive electrodes. An aqueous solution of potassium hydroxide or a solution of zinc chloride can be used as an electrolyte.

The air supplied from the outside with the help of catalysts forms hydroxide ions in the aqueous electrolyte solution, which oxidize the zinc electrode. During this reaction, electrons are released, forming an electric current.

Advantages

According to some estimates, world reserves of zinc are about 1.9 gigatons. If we start the world production of metallic zinc now, then in a couple of years it will be possible to assemble a billion air-zinc batteries with a capacity of 10 kWh each. For example, it would take more than 180 years to create the same amount under current lithium mining conditions. The availability of zinc will also reduce the price of batteries.

It is also very important that air-zinc cells, having a transparent recycling scheme for used zinc, are environmentally friendly products. The materials used here do not poison environment and can be reworked. The reaction product of air-zinc batteries (zinc oxide) is also absolutely safe for humans and their environment. No wonder zinc oxide is used as the main ingredient in baby powder.

The main advantage, thanks to which electric vehicle builders look to this technology with hope, is the high energy density (2-3 times higher than that of li-ion). Already, the energy intensity of Zinc-Air reaches 450 Wh/kg, but the theoretical density can be 1350 Wh/kg!

Flaws

Since we do not drive electric cars with zinc-air batteries, then there are disadvantages. Firstly, such cells are difficult to make rechargeable with a sufficient number of discharge / charge cycles. During the operation of a zinc-air battery, the electrolyte simply dries out, or it penetrates too deeply into the pores of the air electrode. And since the deposited zinc is distributed unevenly, forming a branched structure, short circuits often occur between the electrodes.

Scientists are trying to find a way out. The American company ZAI solved this problem by simply changing the electrolyte and adding fresh zinc cartridges. Naturally, this will require a developed infrastructure of filling stations, where the oxidized active material in the anode cassette will be replaced with fresh zinc.

And although the economic component of the project has not yet been worked out, manufacturers claim that the cost of such a “charge” will be significantly lower than refueling a car with an internal combustion engine. In addition, the process of changing the active material will require no more than 10 minutes. Even ultra-fast ones can only replenish 50% of their potential in the same time. Last year, the Korean company Leo Motors has already demonstrated zinc air batteries ZAI in his electric truck.

Working on improving the Zinc-Air battery and technology firm from Switzerland ReVolt. She proposed special gel-forming and binder additives that control the moisture and shape of the zinc electrode, as well as new catalysts that significantly improve the performance of the cells.

Still, the engineers of both companies never managed to overcome the milestone of 200 discharge / charge cycles of Zinc-Air. Therefore, it is too early to talk about zinc-air cells as electric batteries.

The novelty promises to surpass lithium-ion batteries in terms of energy consumption by three times and at the same time cost half as much.

Note that now zinc-air batteries are produced only in the form of disposable cells or "rechargeable" manually, that is, by changing the cartridge. By the way, this type of battery is safer than lithium-ion, as it does not contain volatile substances and, accordingly, cannot ignite.

The main obstacle to creating rechargeable options from the network - that is, batteries - is the rapid degradation of the device: the electrolyte is deactivated, the oxidation-reduction reactions slow down and stop altogether after just a few recharge cycles.

To understand why this happens, we must first describe the principle of operation of air-zinc elements. The battery consists of air and zinc electrodes and electrolyte. During discharge, the air coming from outside, not without the help of catalysts, forms hydroxyl ions (OH -) in an aqueous electrolyte solution.

They oxidize the zinc electrode. During this reaction, electrons are released, forming a current. During battery charging, the process goes in the opposite direction: oxygen is produced at the air electrode.

Previously, during the operation of a rechargeable battery, the aqueous electrolyte solution often simply dried out or penetrated too deeply into the pores of the air electrode. In addition, the deposited zinc was distributed unevenly, forming a branched structure, due to which short circuits began to occur between the electrodes.

The novelty is devoid of these shortcomings. Special gelling and astringent additives control the moisture and shape of the zinc electrode. In addition, scientists have proposed new catalysts, which also significantly improved the performance of the elements.

So far, the best performance of prototypes does not exceed hundreds of recharge cycles (photo by ReVolt).

ReVolt CEO James McDougall believes that the first products, unlike current prototypes, will be recharged up to 200 times, and will soon be able to reach the mark of 300-500 cycles. This indicator will allow the element to be used, for example, in cell phones or laptops.

Prototype new battery was developed at the Norwegian research foundation SINTEF, while ReVolt is commercializing the product (ReVolt illustration).

ReVolt is also developing zinc air batteries for electric vehicles. Such products resemble fuel cells. The zinc suspension in them plays the role of a liquid electrode, while the air electrode consists of a system of tubes.

Electricity is generated by pumping the suspension through the tubes. The resulting zinc oxide is then stored in another compartment. When recharged, it goes through the same path, and the oxide turns back into zinc.

Such batteries can produce more electricity, since the volume of the liquid electrode can be much larger than the volume of the air electrode. McDougall believes this type of cell could be recharged between two and ten thousand times.

These elements are the most dense of all modern technologies. The reason for this was the components used in these batteries. These cells use atmospheric oxygen as the cathode reagent, which is reflected in their name. In order for air to react with the zinc anode, small holes are made in the battery case. Potassium hydroxide, which is highly conductive, is used as the electrolyte in these cells.
Originally designed as non-rechargeable power supplies, zinc-air elements characterized by a long and stable shelf life, at least if stored airtight, in an inactive state. In this case, during the year of storage, such elements lose about 2 percent of their capacity. Once the air gets into the battery, these batteries don't last longer than a month, whether you use them or not.
Some manufacturers have started using the same technology in rechargeable cells. Best of all, such elements have proven themselves during long-term operation in low-power devices. The main disadvantage of these elements is the high internal resistance, which means that in order to achieve high power, they must be huge. And this means the need to create additional battery compartments in laptops, comparable in size to the computer itself.
But it should be noted that they began to receive such application quite recently. The first such product is a joint creation of Hewlett-Packard Co. and AER Energy Resources Inc. - PowerSlice XL - showed the imperfection of this technology when used in laptop computers. This battery, designed for the HP OmniBook 600 laptop, weighed 3.3 kg - more than the computer itself. She provided only 12 hours of work. Energizer has also begun using this technology in their small button batteries used in hearing aids.
Recharging batteries is also not an easy task. Chemical processes are very sensitive to electric current supplied to the battery. If the applied voltage is too low, the battery will give current instead of receiving. If the voltage is too high, unwanted reactions can begin that can damage the element. For example, when the voltage is raised, the current strength will necessarily increase, as a result, the battery will overheat. And if you continue to charge the cell after it is fully charged, explosive gases may begin to be released in it and even an explosion may occur.

Charging technologies
Modern devices for recharging are quite complex electronic devices with various degrees of protection - both yours and your batteries. In most cases, each cell type has its own charger. If the charger is used incorrectly, not only the batteries, but also the device itself, or even systems powered by batteries, can be damaged.
There are two modes of operation chargers- with constant voltage and with direct current.
The simplest are devices with constant voltage. They always produce the same voltage, and supply a current that depends on the battery level (and other environmental factors). As the battery charges, its voltage increases, so the difference between the potentials of the charger and the battery decreases. As a result, less current flows through the circuit.
All that is needed for such a device is a transformer (to reduce the charging voltage to the level required by the battery) and a rectifier (to rectify alternating current to a constant, used to charge the battery). Such simple devices rechargers are used to charge car and ship batteries.
As a rule, lead batteries for power sources are charged by similar devices. uninterruptible power supply. In addition, constant voltage devices are also used to recharge lithium-ion cells. Only there are added circuits to protect the batteries and their owners.
The second type of charger provides a constant current and changes the voltage to provide the required amount of current. Once the voltage reaches the full charge level, charging stops. (Remember, the voltage created by the cell drops as it discharges.) Typically, such devices charge nickel-cadmium and nickel-metal hydride cells.
In addition to the desired voltage level, chargers need to know how long it takes to recharge the cell. The battery can be damaged if you charge it for too long. Depending on the type of battery and on the "intelligence" of the charger, several technologies are used to determine the recharge time.
In the most simple cases for this, the voltage generated by the battery is used. The charger monitors the battery voltage and turns off when the battery voltage reaches a threshold level. But this technology is not suitable for all elements. For example, for nickel-cadmium it is not acceptable. In these elements, the discharge curve is close to a straight line, and it can be very difficult to determine the threshold voltage level.
More "sophisticated" chargers determine the recharge time by temperature. That is, the device monitors the temperature of the cell, and turns off or reduces the charge current when the battery starts to heat up (which means overcharging). Usually, thermometers are built into such batteries, which monitor the temperature of the element and transmit the corresponding signal to the charger.
"Smart" devices use both of these methods. They can go from high charge current to low charge current, or they can support D.C. using special voltage and temperature sensors.
Standard chargers give less charge current than the cell's discharge current. And chargers with a large current value give more current than the rated discharge current of the battery. A trickle charge device uses a current so small that it almost does not allow the battery to self-discharge (by definition, such devices are used to compensate for self-discharge). Typically, the charge current in such devices is one-twentieth or one-thirtieth of the battery's rated discharge current. Modern chargers can often handle multiple charge currents. They use higher currents at first and gradually switch to lower currents as they approach fully charged. If you use a battery that can withstand trickle charging (nickel-cadmium, for example, do not), then at the end of the recharge cycle, the device will switch to this mode. Most laptop chargers and cell phones are designed so that they can be permanently connected to the elements and do not harm them.