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 <bro...@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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