Battery for BTE hearing aids

Medium- and high-power behind-the-ear hearing aids usually use A13 batteries, while extra-high-power behind-the-ear headphones use A675 batteries.

Acoustic characteristics of BTE hearing aids
Compared with the box-type hearing aid, the behind-the-ear hearing aid has a microphone positioned above the auricle, so it can reduce the phenomenon of the human torso’s enhanced low-frequency reflection and reduce the noise caused by friction of the hearing aid. However, the presence of the ear mold and the sound tube will cause the external auditory canal resonance peak to move forward, and the amplitude is larger than that of the in-ear hearing aid. The highest peak gain frequency of BTE hearing aids is mostly at 100OH. At this point, the peak sound gain is large. In addition, the acoustic characteristics of the behind-the-ear hearing aid can be changed by adjusting the ear mold, so that it has a wider frequency response. Compared with the earphone, it can accommodate a larger vent hole, making the acoustic compensation more flexible.

Benefits of BTE Hearing Aids
1. Compared with box machine
The advantages of BTE hearing aids over cassette players include:
① Hearing-aid hearing aids have no wires and are small in size. They are easily hidden in the hair and have a certain aesthetic appearance.
②Since it does not cause friction with clothes, noise is reduced.
③ The enhancement of low-frequency reflection in the human trunk is significantly reduced. Therefore, behind-the-ear hearing aids with the same technical parameters as the box-type machine are more effective.
2. Compared with intra-ear and ear-canal machines
The advantages of BTE hearing aids over in-the-ear and ear-canal instruments include:
① Behind-the-ear hearing aids are more powerful and suitable for various types of hearing loss.
③ Due to the large volume of BTE hearing aids, designers can easily install some complicated circuits and chips to improve performance and enhance functions. For example, installing induction coils in BTE hearing aids can make deaf children call or make special Clear sound is received in the electrified classroom; directional microphones can be installed.
③ The battery and knob are large and easy to operate.
④ Easy to repair, good durability and easy adjustment.
⑤ Children’s ear canals are in the growing period, and it is not suitable to use in-ear hearing aids. It is more convenient to use the back of the ear to replace the ear mold.
⑥ No customization is required, and mass production is possible, which is conducive to reducing costs.
3.2.4 Disadvantages of BTE hearing aids
The disadvantages of BTE hearing aids include:
① The microphone hole of the behind-the-ear hearing aid is located above the auricle, and the heat on the head or sweat after exercise easily penetrates into this hole and other parts of the hearing aid, causing the hearing aid to malfunction. When there is a temperature difference, small water droplets are easy to appear in the sound tube and the like, making the hearing aid silent.
② Behind-the-ear hearing aids are located behind the ears, and it is inconvenient to adjust the switch and volume control.
③ For people with high appearance requirements, such hearing aids are still too large and too conspicuous.
④Compared with the box-type hearing aid, the distance between the microphone of the behind-the-ear hearing aid and the receiver outlet is closer. When improperly installed or the gain is large, it may easily cause the sound of the receiver to overflow and enter the microphone again, causing the sound to be amplified twice, causing Acoustic feedback is howling, so behind-the-ear hearing aids with higher power must have custom ear molds.
⑤ Easy to produce ear plugging effect. The ear plugging effect means that after the ear cavity or the external auditory canal entrance is blocked by the ear mold, the patient feels that his voice sounds like an echo or sounds dull and unnatural. The ear plugging effect is mostly caused by low and medium frequencies below 1000 Hz. The original burial is mainly caused by the patient’s vocalization. Because the ear mold is worn, the sound cannot be leaked, causing the external auditory meatus wall (cartilage) to vibrate, and the generated sound waves are transmitted to the ear again, resulting in increased low-frequency sound pressure in the external auditory meatus. The ear plugging effect is often the main reason for complaints of discomfort after wearing hearing aids in people with low-frequency hearing or near-normal hearing. The traditional solution is by expanding the ear mold vents or using an open
Sexual ear mold, but easy to cause acoustic feedback and change the frequency response range of the hearing aid.
3.2.5 Adaptation range of BTE hearing aids
At present, the power range of commonly used hearing aids is generally 40-120dB, the range of small and medium power is about 40-90dB, the range of high-power is about 40-105dB, and the range of extra-high power is about 40-120dB. From the size and characteristics of its power range, BTE hearing aids are basically suitable for patients with light, moderate and severe hearing loss. Combining its advantages and disadvantages, BTE hearing aids are generally suitable for the following people:
①Because of its large size, convenient operation and flexible selection, BTE hearing aids are the first choice for elderly patients with hearing impairment.
② The child’s ear canal is in the growing period. If the custom-made hearing aid is selected and the shell needs to be replaced frequently, it will increase the extra financial burden on the patient, and frequent replacement of the shell is likely to cause damage to the hearing aid. After children choose the BTE hearing aid, they only need to change the ear molds regularly and adjust the hearing aid data in time.
③Patients with middle ear disease, especially those with otitis media and secretions in the ear, if a customized hearing aid is selected, the probability of the damage to the hearing aid will increase, and the performance and overall life of the hearing aid will increase. Make an impact. Patients with middle ear disease can choose back-to-ear hearing aids. The chance of hearing aids being damaged is relatively low, which is beneficial to extending the life of hearing aids and obtaining the best hearing aid results.

④ For patients with deformed external ears, or after otological surgery, middle ear surgery, etc., if you cannot wear a customized hearing aid, you can consider choosing a back-ear hearing aid.