Ulf -
Yes, this question, about the HP 105B, was asked in September 2016.
https://www.febo.com/pipermail/time-nuts/2016-September/100436.html
In Europe, it is virtually impossible (RoHS) to acquire NiCad batteries for
past decade — unless you are an exempt entity.
IF you desire a DIY Build,
I have two Powerex MH-808M for sixteen cells.
I have two 105B and I have modified them with a custom connector and
holder so that I can remove the cells and charge them in the 808, then
put them back, disconnecting the trickle charger.
Ian
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On Behalf Of Brooke Clarke
Sent: Friday, January 5, 2018 11:48 AM
To: Ulf Kylenfall via time-nuts
Subject: Re: [time-nuts] HP 105B: Modern replacement for NiCad battery pack?
Hi Ulf:
There's another problem with switching to Ni-MH and that's related to the heat
generated when charging them. You
105B: Modern replacement for NiCad battery pack?
Since NiMH cells typically have over twice the capacity of NiCad cells, a C/10
charger will charge them at less than C/20.It's best to trickle charge NiMH
cells in the C/30 to C/40 range, but depending on the cell C/20 might be OK.
Measure
Hi Ulf:
There's another problem with switching to Ni-MH and that's related to the heat generated when charging them. You can
charge Ni-Cad batteries without monitoring the pack temperature, but with Ni-MH cells you must monitor the pack
temperature. I would suggest avoiding the Ni-MH option.
Since NiMH cells typically have over twice the capacity of NiCad cells, a C/10
charger will charge them at less than C/20.It's best to trickle charge NiMH
cells in the C/30 to C/40 range, but depending on the cell C/20 might be OK.
Measure your charge current on a discharged pack and
5, 2018 10:00 AM
> To: Ulf Kylenfall; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 105B: Modern replacement for NiCad battery pack?
>
> Ulf
> A drop in replacement for nicads is nickle metal hydride or NiMh. Nicads are
> still available but can be
and frequency measurement
Subject: Re: [time-nuts] HP 105B: Modern replacement for NiCad battery pack?
Ulf
A drop in replacement for nicads is nickle metal hydride or NiMh. Nicads are
still available but can be expensive.
The other comment I would make is the 1970s charging circuits were pretty crude
Ulf
A drop in replacement for nicads is nickle metal hydride or NiMh. Nicads
are still available but can be expensive.
The other comment I would make is the 1970s charging circuits were pretty
crude and lead to boiled batteries.
If your going to invest in an internal battery you may want to
Gentlemen,
I may have asked this question before...
I am looking for a modern replacement for the NiCadbattery pack used in the HP
105B. One such 105that I salvaged have been standing on a shelf with
thebatteries "happily boiling away".
So, what kind of chemistry would be possible to
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