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Discussion Starter #1
I have a 93AH Saft NiMH battery with several dead or very weak cells.
I suspect that the electrolyte level is low due to overheating.

Has anyone attempted resucitating these cells?

Any idea what concentration of Potassium Hydroxide is appropriate?

Thanks,
storm

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http://www.austinev.org/evalbum/1059
http://stormselectric.blogspot.com/
Storm

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Discussion Starter #2
Here's an interesting page on refurbishing NiMH prius batteries,
http://hiwaay.net/~bzwilson/prius/pri_batt.html


storm connors <[email protected]> wrote:
> I have a 93AH Saft NiMH battery with several dead or very weak cells.
> I suspect that the electrolyte level is low due to overheating.
>
> Has anyone attempted resucitating these cells?
>
> Any idea what concentration of Potassium Hydroxide is appropriate?
>
> Thanks,
> storm
>
> --
> http://www.austinev.org/evalbum/1059
> http://stormselectric.blogspot.com/
> Storm
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
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>



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Discussion Starter #3
Hello Storm,

When I was working in a military battery shop way back, we pull the aircraft
batteries, discharge them down to 0 volts, remove the electrolyte which was
KOH or Potassium Hydroxide. Suspend the battery upside down in a sonic tank
of distill water for about a hour and then put in new KOH which was at that
time had a specific gravity of 1.200 and then charge the cell.

A long time ago, I seen a web site, that show how to maintain these types of
batteries and did show the correction electrolyte types and specific
gravity. I got to it by just typing in KOH electrolyte or something like
that.

Roland


----- Original Message -----
From: "storm connors" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Wednesday, December 15, 2010 11:31 AM
Subject: [EVDL] NiMH cell repair


> I have a 93AH Saft NiMH battery with several dead or very weak cells.
> I suspect that the electrolyte level is low due to overheating.
>
> Has anyone attempted resucitating these cells?
>
> Any idea what concentration of Potassium Hydroxide is appropriate?
>
> Thanks,
> storm
>
> --
> http://www.austinev.org/evalbum/1059
> http://stormselectric.blogspot.com/
> Storm
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #5
Peter,
Thanks. It appears from that site that adding water may be the best bet.

On Wed, Dec 15, 2010 at 3:12 PM, Peter Gabrielsson
<[email protected]> wrote:
> Here's an interesting page on refurbishing NiMH prius batteries,
> http://hiwaay.net/~bzwilson/prius/pri_batt.html
>
>
>
storm connors <[email protected]> wrote:
>> I have a 93AH Saft NiMH battery with several dead or very weak cells.
>> I suspect that the electrolyte level is low due to overheating.
>>
>> Has anyone attempted resucitating these cells?
>>
>> Any idea what concentration of Potassium Hydroxide is appropriate?
>>
>> Thanks,
>> storm
>>
>> --
Storm

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70 Posts
Discussion Starter #6
I will keep looking. Thanks Roland.

Roland Wiench <[email protected]> wrote:
> Hello Storm,
>
> When I was working in a military battery shop way back, we pull the aircr=
aft
> batteries, discharge them down to 0 volts, remove the electrolyte which w=
as
> KOH or Potassium Hydroxide. Suspend the battery upside down in a sonic=
tank
> of distill water for about a hour and then put in new KOH which was at th=
at
> time had a specific gravity of 1.200 and then charge the cell.
>
> A long time ago, I seen a web site, that show how to maintain these types=
of
> batteries and did show the correction electrolyte types and specific
> gravity. I got to it by just typing in KOH electrolyte or something li=
ke
> that.
>
> Roland
>
>
> ----- Original Message -----
> From: "storm connors" <[email protected]>
> To: "Electric Vehicle Discussion List" <[email protected]>
> Sent: Wednesday, December 15, 2010 11:31 AM
> Subject: [EVDL] NiMH cell repair
>
>
>> I have a 93AH Saft NiMH battery with several dead or very weak cells.
>> I suspect that the electrolyte level is low due to overheating.
>>
>> Has anyone attempted resucitating these cells?
>>
>> Any idea what concentration of Potassium Hydroxide is appropriate?
>>
>> Thanks,
>> storm
>>
>> --
>> http://www.austinev.org/evalbum/1059
>> http://stormselectric.blogspot.com/
>> Storm
>>
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
>> | Multiple-address or CCed messages may be rejected.
>> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
>> | OTHER HELP: http://evdl.org/help/
>> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>>
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>



-- =

http://www.austinev.org/evalbum/1059
http://stormselectric.blogspot.com/
Storm

_______________________________________________
| REPLYING: address your message to [email protected]xxx.edu only.
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70 Posts
Discussion Starter #7
Nice find, Rod. Thank you. The only access to the cells that I can see
is through a tiny pressure vent. Washing them out doesn't seem
feasible, but I will inspect further.
storm

Rod Hower <[email protected]> wrote:
> Safety first! Use rubber gloves and goggles! Have a supply of vinegar on =
hand in
> case you spill electrolyte on yourself. While alkaline electrolyte is not=
as
> fierce as the sulfuric acid used in lead-acid cells, it can still burn,
> especially if it gets into your eyes.
> Rinse the emptied cells with distilled water until they are clean. Dispos=
e of
> this wash water, and any spent electrolyte, in a responsible manner. In N=
iCd
> cells, the electrolyte can contain minute amounts of cadmium, so handle i=
t as
> hazardous waste. In NiFe cells, the electrolyte is easier to dispose of=
=97just
> neutralize it with vinegar (or hydrochloric acid, HCl, available from any=
pool
> supply house) and you can compost it.
> Mix the new electrolyte using technical grade potassium hydroxide (KOH). =
This is
> available from most chemical supply stores. Stir the KOH into distilled w=
ater in
> a large plastic container. I use a clean, 32 gallon, heavy duty, plastic =
trash
> can. Keep adding KOH until the specific gravity of the electrolyte is bet=
ween
> 1.2 and 1.25. This amounts to about 1 pound of KOH to 1 gallon of distill=
ed
> water. If you add too much KOH, simply bring the specific gravity down by=
adding
> more distilled water. Use a clean (never used with a lead-acid battery),
> temperature-compensated hydrometer to measure the specific gravity of the=
new
> electrolyte. When the KOH dissolves, it will give off heat, so add the KOH
> slowly (about a pound at a time), mix thoroughly (I use a hunk of clean p=
lastic
> conduit to stir the mixture), and wait for everything to cool off before =
making
> the specific gravity measurement. Mix all the electrolyte you will need a=
t the
> same time if possible. This assures uniformity in the electrolyte.
> When the electrolyte is cool and at the proper specific gravity, refill t=
he
> cells. Add a thin (1/8 inch thick) layer of pure (USP) mineral oil (from =
any
> drug store) to the top of each cell and you=92re ready to put the cells b=
ack in
> service. Expect the cells to take five or six cycles before coming up to =
full
> capacity.
> Richard Perez =95 Home Power
>
>
> ----- Original Message ----
> From: Roland Wiench <[email protected]>
> To: Electric Vehicle Discussion List <[email protected]>
> Sent: Wed, December 15, 2010 4:06:19 PM
> Subject: Re: [EVDL] NiMH cell repair
>
> Hello Storm,
>
> When I was working in a military battery shop way back, we pull the aircr=
aft
> batteries, discharge them down to 0 volts, remove the electrolyte which w=
as
> KOH or Potassium Hydroxide. Suspend the battery upside down in a sonic=
tank
> of distill water for about a hour and then put in new KOH which was at th=
at
> time had a specific gravity of 1.200 and then charge the cell.
>
> A long time ago, I seen a web site, that show how to maintain these types=
of
> batteries and did show the correction electrolyte types and specific
> gravity. I got to it by just typing in KOH electrolyte or something li=
ke
> that.
>
> Roland
>
>
> ----- Original Message -----
> From: "storm connors" <[email protected]>
> To: "Electric Vehicle Discussion List" <[email protected]>
> Sent: Wednesday, December 15, 2010 11:31 AM
> Subject: [EVDL] NiMH cell repair
>
>
>> I have a 93AH Saft NiMH battery with several dead or very weak cells.
>> I suspect that the electrolyte level is low due to overheating.
>>
>> Has anyone attempted resucitating these cells?
>>
>> Any idea what concentration of Potassium Hydroxide is appropriate?
>>
>> Thanks,
>> storm
>>
>> --
>> http://www.austinev.org/evalbum/1059
>> http://stormselectric.blogspot.com/
>> Storm
>>
>> _______________________________________________
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http://stormselectric.blogspot.com/
Storm

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Discussion Starter #8
I don't know how similar they are, but when NiCd batteries are discharged,
the electrolyte level is low - so low sometimes that you can't even see it.
You do NOT want to fill until you've charged, as it will rise with charging.

Again, no idea whether the NiMH are similar, but be carefuli.

David Roden - Akron, Ohio, USA
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Discussion Starter #9
yep, and cycling, maybe even some baking.


storm connors <[email protected]> wrote:
> Peter,
> Thanks. It appears from that site that adding water may be the best bet.
>
> On Wed, Dec 15, 2010 at 3:12 PM, Peter Gabrielsson
> <[email protected]> wrote:
>> Here's an interesting page on refurbishing NiMH prius batteries,
>> http://hiwaay.net/~bzwilson/prius/pri_batt.html
>>
>>
>> On Wed, Dec 15, 2010 at 11:31 AM, storm connors <[email protected]> wrote:
>>> I have a 93AH Saft NiMH battery with several dead or very weak cells.
>>> I suspect that the electrolyte level is low due to overheating.
>>>
>>> Has anyone attempted resucitating these cells?
>>>
>>> Any idea what concentration of Potassium Hydroxide is appropriate?
>>>
>>> Thanks,
>>> storm
>>>
>>> --
> Storm
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