How to replace battery in Phonak Audeo M-50R

By the way, the new batteries I have installed in my Marvel M50-R are still working perfectly. Also, the next replacement will be a lot easyer

I am wondering if anybody did that… Let me know…

I bought used Marvel rechargeables so I will definitely be doing this. Is there any way to assess battery health quantitatively or is just subjective guesswork?

I think it’s just a matter of noticing that they no longer hold a charge for any length of time, battery health (SOC) can be viewed in the App I believe.

I agree with tenkan. You will note that the battery will loose charge more quickly until it will no longer charge. Then, the HA will show a steady red light when inserted in the charger.

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.

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.

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 !

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.