[time-nuts] HP 5065A battery pack

Bob Camp kb8tq at n1k.org
Sat Nov 21 09:13:07 EST 2015


The key issue is that there has been a lot learned about charging batteries
since the 5065A was designed. Just as other parts of the 5065 can be improved
with some work, so can the battery charger. Given that NiCad’s aren’t cheap,
it’s worth noting that the circuit could be worked on *before* somebody buys
a bunch of batteries to re-cell one.

Moving a bit further off topic and back to our original conversation when you re-did
yours (2 years ago?) - you don’t get a lot of standby time even with the full load of 
NiCads in there. 


> On Nov 20, 2015, at 9:45 PM, Dan Rae <danrae at verizon.net> wrote:
> On 11/20/2015 4:54 PM, Bob Camp wrote:
>> Hi
>> I don’t in any way doubt your count. If indeed they are putting 21 cells into that circuit,
>> the NiCads likely don’t last as long as they might with a different charging circuit ….
>> Bob
> Bob, I was answering Corby's query; mine had an original -hp- battery pack which I assumed was designed by someone who knew what they were doing, so I just put new Chinese made 2.2 Ah Nicad cells in it, exactly the same number as the original, however I don't know the capacity of the originals, they were unmarked.  Five or six years later it still will hold the thing up for at least twenty minutes, which I would think is what matters.
> It would in any case be difficult to fit any more than 21 in the space available.
> Dan
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