[time-nuts] HP-105B Battery Replacement?

Brooke Clarke brooke at pacific.net
Fri Sep 16 14:37:23 EDT 2016


Hi David:

The chemistries are very different. Ni-Cad is endothermic whereas Ni-MH is Exothermic.  This is why chargers for Ni-MH 
have a mandatory temperature sensor.  This is one of the reasons I say Ni-Cad cells batteries are easy to charge.

-- 
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.

-------- Original Message --------
> NiMH batteries are close the same voltage and charge the same as NiCd and are more available and not toxic when 
> disposing of them. They should be a good replacement.  Lithiums are very different in voltage and charging.
>
> David N1HAC
>
> On 9/14/16 10:19 PM, Jeremy Nichols wrote:
>> Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel
>> cells) but rather lithium rechargeable, providing I can find a type that
>> won't catch fire and will work with the 105B'scircuits.
>>
>> Jeremy
>>
>>
>> On Wednesday, September 14, 2016, Brooke Clarke <brooke at pacific.net> wrote:
>>
>>> Hi Alex:
>>>
>>> Yes, I'm recommending Ni-Cad but NOT any acid type.
>>>
>>> -- 
>>> Have Fun,
>>>
>>> Brooke Clarke
>>> http://www.PRC68.com
>>> http://www.end2partygovernment.com/2012Issues.html
>>> The lesser of evils is still evil.
>>>
>>> -------- Original Message --------
>>>
>>>> Hi Brooke,
>>>>
>>>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they
>>>> have K-OH  kalium hidrioxid  [potassium hydroxide  for anglophone ] as
>>>> electrolyte and they are normally very air-tide, and widely used in radios.
>>>>
>>>> 73
>>>>
>>>> KJ6UHN
>>>>
>>>> Alex
>>>>
>>>> On 9/14/2016 4:45 PM, Brooke Clarke wrote:
>>>>
>>>>> Hi Jeremy:
>>>>>
>>>>> It's a very bad idea to put any battery with acid in an enclosure that
>>>>> has electronics since if it vents the acid will etch the PCBs.
>>>>> Guess how I learned this.  I got a great price on a Gibbs Frequency
>>>>> Standard because the oven no longer worked.
>>>>> http://prc68.com/I/office_equip.html
>>>>>
>>>>>
>>>>> Modern Ni-Cad batteries have much more capacity than older ones and no
>>>>> longer have a memory effect.  They are also very easy to charge, so why not
>>>>> just replace the old cells?
>>>>>
>>>>>
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>
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