No need to replace the battery. Battery Capacity of Hearing Device: 48mAh. Input Noise: ≤26dB. TypeHearing Aid. Battery Capacity of Charging Case: 1000mAh.
eBay
3.7V 110mAh Polymer Lithium LiPo Rechargeable Battery 302025 For Bluetooth headset, beauty instrument, selfie stick, spray, etc
Aliexpress UK
We are confident in the quality of our Bluetooth hearing amplifier earbuds. With the latest Bluetooth version, you get a greater range at faster speeds using lower power. Digital Signal Processing creates a safe experience that suppresses noise without blocking the speech signal.
eBay
3.7V 450mAh Polymer Lithium LiPo Rechargeable Battery 602040 For Bluetooth headset, beauty instrument, selfie stick, spray, etc
Aliexpress UK
Digital Hearing Aids Sound Amplifier Invisible Noise Cancelling 32-Channels (UK). Digital Hearing Aids Invisible 32 Channels Sound Amplifier Noise Cancelling GIFT. 64-Channels Sound Amplifier Digital Hearing Aids Invisible Noise Cancelling Gift.
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1-10 Pcs 501340 300mAh 3.7V LI PO Battery 501440 Rechargeable Polymer Batteries for TWS Bluetooth Headphones Voice Recorder
Aliexpress UK
4in1 Wireless Carplay Adapter Carplay Airplay for Android Auto iPhone Dongle. Hearing aid mode can be used in both cases; Bluetooth mode only supports single-ear mode, two do not support pairing;. 5 It is also a Bluetooth headset, and long press to switch to Bluetooth mode after startup.
eBay
2pcs 3.7V 250mAh 0.925Wh Polymer Li Lithium Battery 602025 Li-ion For Bluetooth Speaker Headphones GPS Sat Nav Driving Recorder
Aliexpress UK
Do you struggle to hear everything clearly?. No more hassle of replacing batteries – our power ear technology enables you to hear everything with clarity and ease, from whispers to loud conversations.
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3.7V 2000mAh 103450 Polymer Lithium Rechargeable Battery jst PH 2.0mm 2pin plug for Camera GPS navigator MP5 Bluetooth Headset
Aliexpress UK
The Specsavers Advance Slimline Rechargeable Hearing Aids by connexx with blue tooth and up to 18hrs use on one charge . In original boxes and Travel Charger at a cost of £2000 new 3 years ago ,see photo of receipts for deposit and final Payment are designed for unisex adults looking for reliable and discreet hearing assistance. With a sleek Receiver in Canal (RIC) fitting and digital sound compatable to use with any modern cell phone
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Soshine 3.7V 502030 250mAh Lipo Polymer Lithium Rechargeable Battery for Wireless Bluetooth Headset Toy Smart Watch LED Lights
Aliexpress UK
Excellent hearing aids, only selling as have changed to ‘in ear canal’ aids. Work very well playing tv into hearing aids, good adjustments via app.
eBay
▶103450 3.7V 2000mAh Polymer Lithium Rechargeable Battery jst PH 2.0mm 2pin plug for Camera GPS navigator MP5 Bluetooth Headset
Aliexpress UK
The cause of howling/noise: To make a small size hearing aid, the internal amplifier and the microphone are close to each other. The sound is continuously received and extended, so it has a certain possibility of producing howling after power-on.
eBay
3.7V 600mAh 502060/522060 LiPo Polymer Battery for E-book Camera MP3 GPS DVD Bluetooth Headset Recorder
Aliexpress UK