Insight into the inside of the hearing aid

Not sure I can buy that. I’d never design it that way without some significant pressure to hold it in place. I’d want something gas-tight.

WH

They are welded, because that’s the only way to get a reliable connection. At larger scale, like in EV battery packs, the size of things makes it practical to spot weld. That process is where a current is run through the battery end cap and wire/cable/nickel strip, and the resistance from the tiny point contact turns that current into sufficient heat to melt things together. Without being enough to damage the battery.

On a smaller scale, which might very well apply here, a very light gauge wire is fed and pressed in contact with the battery while an ultrasonic vibration is induced between the two. The friction creates the heat to form the weld, and again it’s very localized and limited to protect the battery (or other parts involved.)

In any case, the joint is welded, as in the two metals melted together.

I can’t see the spot weld on the KS10 battery. There’s a small exposed section of enameled wire that’s touching the battery. Absolutely no trace of welding or soldering between the wire and battery.

For what it’s worth there are wireless earphones that don’t have welded battery:

DavelL, you are are correct. 70% alcohol and 30% water. Good for disinfecting and cleaning.
Wax are produced by our ears naturally. Lubricating and protecting our ear canals. Some have more and some have less. Those who produced more will have to check their wax guard regularly. Used the brush to brush away the wax everyday before putting them into the charger. The Audi will teach you or watch some of the video in YouTube…

Thanks for the picture. On your hearing aid it appears that the wire is soldered to the battery. The battery case looks different from KS10 as well.

@yoyomin said:

The battery case looks different from KS10 as well.

Yes the KS10’s are a different housing.

@gtremblay said:

The battery is a Z23L Li-ion.

It’s made by this company http://m.zenipower.com/page.html?id=73106

They are 7.8mm x 5.3mm and 23mAh according to;

https://patents.google.com/patent/US20140320089A1/en77

Ohhhh that’s the way, our first “guinea pig” so to say! I’ll be looking forward to hearing your results on this.

Would it be possible to make a group buy?
If it is glued, how do we proceed for the swap?

Import data confirms that Sonova uses ZeniPower Z23L battery.

They actually give some options at the bottom of this page, the first option looks like a nickel tab is just attached with tape:

https://www.coincell.cn/Secondary%20Coin.html35

I’ve also seen a few like this which look spot welded:

I hear ya Dave! I do prefer the Cerustop matchstick style! Changing waxguards is definitely a challenge…

The 400909 lipo cells have shown up, they are tiny but I suspect that they won’t fit as the largest dimension is 9mm and they aren’t particularly squishy.

I’m waiting on some secondhand Marvel 90Rs which are due to be my backup pair but also the guinea pigs for this.

I think that getting hold of some real button cells will be the only proper solution though.
There are a lot of cheap rechargeable hearing aids on Amazon, I have a couple, maybe one of those might yield a suitable battery…

this topic is interesting to me it gives hope to me who bought the demo hearing aids

By the way, maybe we will see that someone manages to make rechargeable hearing aids that can carry an additional slot for disposable batteries like roger-x. …

I would ask the admin to separate the conversation in which the wax protectors /clean dome are talked about so that the topic would be transparent for new members later.