Oticon Opn S 1 rechargeable malfunction

I read somewhere that if you let them sit too long there is no bringing them back.

Menglxs You Da Man!!!
Took a bit of rigging but it worked.
Left them connected for only a few min, current draw was continuously dropping (About 30ua)
Oticon charger picked up and finished the charge.
Battery checks out good in Genie2, charges and lasts 20 hrs or so.

Thank you very much!!!

Hope I can return the favor sometime.

Mike

I agree with what you are saying.
I think in the case of the OPN S Rechargeable, they shut down before fully depleted and the charger will connect and charge.
I think if you leave them uncharged and they drain fully over time the charger will not pick up.

Any how the quick flash charge with 3 1.5 v (4.5v Total) in series worked for me to get it going, all good for now.

Thanks
Mike

Congratulations to you!
Please don’t think about returning a favor to me, I also got a lot of help in this forum.

@@michael.letizia said:

Resurrecting this thread.
I have the same issue, 1 flashing in the charger.
I have 2 sets and swapped batteries to confirm.
It’s the battery that is bad, why??? Who Knows.

Now where to find aftermarket Battery???
Not seeing anything on-line.

Still looking for a battery source.

The battery in my Oticon OPN S is marked Z22.

The size and type is not yet recognized in Wiki.

The only Google reference I can find of the rechargeable Z22 Lithium-ion button cell battery is in a US patent…US9564654B2 - Rechargeable lithium ion button cell battery - Google Patents34

The Patent says: “The capacity is found to be at 24 mAh at 5 mA discharge current, average voltage 3.7V to end voltage 2.75V, after being fully charged to 4.2V. Total energy is 89 mWh and volumetric energy density is 345 Wh/L. Remaining capacity at 80% of initial capacity is found after 600 to 1000 cycles typically at 800 cycles. Cycle regime is at 12 mA constant-current constant-voltage charge to 4.2V and discharge at 12 mA to 3.0V, 25 to 30 Celsius.”

And goes on to describe the Z22 size as diameter 7.8mm and 4.0mm high.

The inventors work at Zhuhai Zhi Li Battery Co Ltd (ZeniPower) Add: 7B, No.130, XingHua Road,
XiangZhou District, ZhuHai, GD519002, China.

I am sure one of you engineering types or other clever sleuths out there, can track down a source for this battery type.

This Oticon video shows how to change it…but not where to get it!

The battery shown as “Oticon” is the Z22 from my OPN S.

@menglxs said:

If the battery is completely dead and cannot be recharged, DIYER can try to activate the battery, take it out, apply a voltage of 3.5-4.3V DC between the “+” and “-” and hold it for a while, this usually brings the battery back to life.
To be clear, I don’t have an OPN S and have never used this way to activate the lithium ion batteries in OPN S, but it has revived the lithium ion batteries in some electronic devices, such as mobile phones.

Lloyds was able to help me.

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Mike

Hello!

I bought on ebay an oticon opn s1 device that is used before. And the seller did not specify that the device is rechargeable. And it came with totally dead battery. I can’t even check is it functioning. Did you solve where to buy such a z22 battery?
As I understood it’s 3.7V. Did you measure the voltage of your?

Thanks for sharing this! Can you keep us up to date maybe in a month or two on whether the revived battery still continues to be charged and functional for the duration it’s supposed to last in each charging cycle? Thanks.

Congratulations, happy DIY!

I have been successful, still working normally for almost a year now.
Still looking for aftermarket replacements though.

Mike

@Volusiano said:

Thanks for sharing this! Can you keep us up to date maybe in a month or two on whether the revived battery still continues to be charged and functional for the duration it’s supposed to last in each charging cycle? Thanks.

One year has gone by and this battery is still going strong without problems (now with another user).

In the last few months I have also brought three different Oticon More dead batteries back to life using the same device (I am now using 30 seconds rather than 60 seconds of zapping).

They are all working perfectly again and recharging as they should…thank you again @menglxs !

@rob.cote100 said:

A HUGE thank you to all of you who’ve contributed to this thread! I have Oticons that I got in the spring of 2021 and last night, Nov 1, had my right HA do the same thing! So I took a 9V battery to bring my HA battery back to life. It’s currently charging and seems fine.

Be careful Rob…4.5 volts does the job. A 9V battery might be dangerous to hit a 3.7V Li-ion battery…over-voltage could lead to thermal runaway with resulting fire/explosion risk.

What is the charging voltage of 3.7V lithium battery?1

The 3.7V lithium battery is a lithium battery with a nominal voltage of 3.7v and a full-charge voltage of 4.2v. It is generally used in various applications

And Rob, a big welcome onboard the forum!

A follow up on this topic. I had to do it a few times afterwards, I would only get 12 hours with it. Then the last time, no dice! It would not charge. I took it in to the audiologist, and she did a reset by holding the volume down button for 5 to 6 seconds, then put it directly in the charger. It charged fine, and doesn’t seem to drain as quickly. So far, so good!

I heard from a forum member (@SpudGunner) who owns the More 1, who had his rechargeable Lithium-ion battery replaced under warranty, that his audi had to reset the More 1 via Genie 2 in order for the HAs to recognize that they have now received a new set of batteries in order for it to work properly.

Originally they gave him the OPN S rechargeable batteries mistakenly as replacement for his More batteries and it was not reset (the audi was on vacation so the receptionist didn’t know better) and it was still acting weird. After the audi got back, he reset the HAs to the new batteries but it was still acting weird. Then he realized that the receptionist doled out the wrong battery for the OPN S instead.

But after the new batteries specifically designed for the More were ordered and used as replacement, and the HAs were reset again, then everything is fine again so far.

I’m guessing that the HAs keep track of the batteries’ performance history and tell the charger how to charge accordingly. So by reviving your batteries with no reset, the HAs still remember them as having a lower capacity and probably only allow the charger to charge only up to that lower capacity. By resetting the HAs, they now think the batteries are freshly new so now the HAs probably start charging them to the full capacity.