[time-nuts] HP 5065A battery pack

Bob Camp kb8tq at n1k.org
Fri Nov 20 16:19:08 EST 2015


Well, the charger brings the stack up to about 33V (34.8V CR7 minus
1.4V in Q5 and Q4).

Since they are NiCad’s that sort of limits the choices in stack size. 
Best bet (and a nice round sounding number) is 24 cells. That would
 1.375V per cell which is just below the “standard” 1.41 V float voltage 
commonly used.  As Q4 and Q5 cut off, the voltage might rise a bit 
above the 33V number, but at pretty low current. 

The other choices would be 23 cells at 1.43V, (that’s a bit much for float
charging) and 25 cells at 1.32V (you will loose capacity at that point). 

On the other side, the battery disconnect drops out (CR11 and CR15)
at 23V. That would be 0.96V per cell on 24 which is still rational for a NiCad.  


> On Nov 20, 2015, at 1:52 PM, cdelect at juno.com wrote:
> Any one know how many cells went into the HP 5065A battery packs?
> Thanks,
> Corby
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