You can buy “Samples” directly through Alibaba but I believe that they redirect you to the manufacturer site. It seems that the manufacturer prefer selling samples to a company instead to an individual…
Thanks for a very informative thread, a small pile of powdered carbon and a single drop of superglue makes a lovely conductive adhesive in my experience with other items try it on a cheap AAA battery.
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Are your replacement batteries still working OK?
Do you get a full day out of a charge?
Thanks!
Still working as new. I get a full day charge.
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Has anyone found the battery on other websites? Shipping from Alibaba is very expensive
This looks like someone who has done the research should put together a group buy to reduce the unit cost.
I am not sure a group buy would be really advantageous. Here is my reasonning for buying 6 batteries at $55+6($3 each): $73. So it is approx $25/pair. Since a pair should be good for 800 recharges or 2.2 years. Then my 6 batteries should allow 6.6 years of use. After that period I believe I will buy a new pair of HA with new technology.
So I believe this a very low cost to revive a very expansive pair of HA that would be otherwise dead. Don’t you?
I guess that after thinking about it, I agree with you. The batteries in my Bolero m90 aids are in great condition, and while programming them, I found out they are still under warranty until February 22, 2024.
Also I suspect that the Li-ion batteries have a shelf life even if never installed in the hearing aids.
If you think about it as a unit cost, relative to the cost of the hearing aids, it really isn’t all that much.
I will keep the info on file just in case. Thanks for the technical presentation.
After reading this thread and discussing with @gtremblay, I decided to replace the batteries in my Phonak Paradise 90 HAs. I used the same procedure described in this thread but I cut open the battery case with an exacto knife.
Everything went well but it was stressful !
My hearing aids are now fully charged and working, I will monitor the charge in the next few days.
Thank you @gtremblay for this thread !
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I have been searching online for the Zenipower Z23L which is the original battery used by Phonak. I cannot find a source for these anywhere. Anyone had any luck in that direction?
The only battery I was able to find is an M7854 from the supplier mentioned in this thread. Do you think a Z23L would be significantly different ?
No, I don’t think the Z23L would be any different. Just wondered if it might be cheaper to obtain.
I hear you, there’re not cheap but at 25$ US it’s still cheap to give a new life to my HAs. In fact, I bought 12 of these, more than will ever need ! 
How did you get the top part of the housing off? I do not want to break it.
I took off the bottom part and have already removed the pin from the receiver.
I carefully pried the 2 front tabs with a finger nail,one after another. Start with one side while maintaining an upward pressure on the front of the body of the HA (there’s a black notch in the front where you can stick your thumb’s finger nail. The 2 back tabs are easier. Take your time and be gentle. 
I did it in a similar way:
Only not with fingernails, but with a thin metal tab.
When levering between the front housing and the circuit board, it made a soft cracking noise. But nothing seems to be broken.
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I used a clockmaker’s screwdriver to keep the tabs raised. The clack sounds I heard were the tabs clicking back over their pins. (I removed the cover to clean out the gunk from the mic holes.)
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I originally came to this thread because my Phonak B-70R showed no life when removed from the charger, although it the green light was showing while charging. I suspected the battery needed replacing.
However, people talking about their old batteries not lasting as long as they did made me think there might be another issue.
What I found was that if the hearing aid is not responding to being turned on, it can be reset with a process of 1. A long press (30 seconds) on the hearing aid, then return to the charger for 1 minute. This worked for me, it might be worth a try before changing a battery. This is the YouTube that explains https://www.youtube.com/watch?v=b8-1QFrWt0g
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Battery Source?
I came across these eBay sellers in China who seem to be selling a version of the replacement batteries that we need for Phonak Marvel and Paradise.
They are approximately $25 for a pair of batteries and free shipping. A better deal than Alibaba.
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Some news…
One of the HA that I repaired stopped working…after I forgot to remove it for the shower!!! The battery is still at 3.7v and charging normally. It seems that the microphones didn’t like that… Ok another DIY project.
I bought (on Ebay) a used Phonak P90 which stopped charging for 100$ us. I successfully changed the battery and it is now back to life again. It was a lot easyer and faster. Very happy about that.
It would be very intereresting to know if someone else tryed it and how it worked.
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