[time-nuts] HP 105B: Modern replacement for NiCad battery pack?

[S McGrath]

The local BatteriesPlus store rebuilt my 105B pack for about $150 -
there was quite a bit of extra labor involved but the pack is
completely to spec except it has more capacity than original

On Fri, Jan 5, 2018 at 12:17 PM, Van Horn, David
<david.vanhorn at backcountryaccess.com> wrote:
>
> Nicads are still made.
>
> NIMH is not necessarily a drop in. While it will work fine in the short term, crude chargers that implement constant trickle like C/10 can be (emphasis) tolerated (/emphasis) by some NIMH cells, and totally out of spec for others.
>
> Modern chargers and NIMH is a good pairing, but if you must use the original NICAD charger, you likely need real NICADs for a long term solution.
>
>
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of paul swed
> Sent: Friday, January 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 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 consider a smarter modern charger.
> There seems to be all sorts of very nice boards out of China for little cost. Its amazing.
> If you go the alternate approach you may consider Lithium batteries.
> Drones seemed to have made a very nice market for batteries and smart chargers.
> Regards
> Paul
> WB8TSL
>
> On Fri, Jan 5, 2018 at 11:46 AM, Ulf Kylenfall via time-nuts < time-nuts at febo.com> wrote:
>
>>
>> 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 usewithout to much
>> re-design of the charging circuitry?
>> Ulf Kylenfall
>> SM6GXV
>>
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