Author Topic: Hearing aid batteries and HgO  (Read 1943 times)

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  • Guest
Hearing aid batteries and HgO
« on: October 14, 2002, 04:21:00 AM »
I don't know if this is as a common as it once was, but hearing aid batteries are comprized of HgO (mercuric oxide) and a Zinc redox system.
Theoretically one could isolate the mercuric oxide and react it with HCl to obtain HgCl2 upon evaporation of the acid.
On a related note there is a battery which uses thionyl Chloride/lithium (just do a google you'll find out)


  • Guest
Lithium battery
« Reply #1 on: October 14, 2002, 06:12:00 AM »
On a related note there is a battery which uses thionyl Chloride/lithium
Isn't that the standard AA lithium battery (blue top) that all the birchers use?

Baseline Does Not Exist.


  • Guest
Well terbium
« Reply #2 on: October 14, 2002, 06:27:00 AM »
Your'e definitley respected in my opinion and know what your'e talking about.
I don't know.
But I do know that those Li/SOCl2 systems aren't rechargeable, so if you use deductive logic, you may arrive at such a conclusion, until expirimetation provides a definitive answer.
Kudos, P2P piece de resistance maestro tebeium!


  • Guest
« Reply #3 on: October 14, 2002, 01:11:00 PM »
SOCl2 in batteries? That would be a very expensive source for SOCl2, but not so bad if you only needed like 2g or so for some nanoscale experiment. That is really good to know.  :)

Firm supporter of the "Purge The Couch!" movement. Vote for the purge today.


  • Guest
those are the ones
« Reply #4 on: October 14, 2002, 05:12:00 PM »
Thionyl chloride is the second part to the common energizer blue top lithium batteries.  The hearing aid and pacemaker batteries are commonly made from lithium and MnO2.

All paths are the same: they lead nowhere


  • Guest
HgO is no longer used.
« Reply #5 on: October 15, 2002, 05:00:00 PM »
Environmental protection regulations and improved battery technology mean that you are unlikely to find HgO in batteries (I suppose you could find old batteries somewhere). Try for Mercury switches used in electronic devices instead - you should still be able to get them from electronics suppliers.


  • Guest
Thionyl chloride
« Reply #6 on: October 16, 2002, 05:20:00 AM »
I was wrong about the blue tops containing thionyl chloride:

As you can see, these batteries are using 1,2-dimethoxyethane and 1,3-dioxolane as solvents.

I was sure that I had recently seen an MSDS for a commercial battery using thionyl chloride as the electrolyte solvent but I haven't been able to find it today. Not in these batteries either:

Here is more on our little friend; the blue-top:

OK, now I found some stuff on thionyl chloride lithium batteries. It seems that these are perhaps produced only for OEM use and are not sold retail.

Baseline Does Not Exist.