[time-nuts] HP 5334A battery

[Tom Miller]

I read somewhere that NiMH batteries do not like float charging. You might 
do some research on that.

What I do is disable the charge circuit and install a Tadiran Li 3.6 volt 
cell. You keep the diode to isolate the Li cell from the normal 5 volts. 
These things will last >20 years and they don't leak.

Regards,
Tom



----- Original Message ----- 
From: "paul swed" <paulswedb at gmail.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Thursday, May 03, 2012 4:26 PM
Subject: Re: [time-nuts] HP 5334A battery


nimh would be the more modern battery that should work in the nicd charge
circuit.
The HP circuits usually were pretty simple actually.
Regards
Paul

On Thu, May 3, 2012 at 2:11 PM, Scott McGrath <scmcgrath at gmail.com> wrote:

> Key here is if battery is ni-cd it implies a charging circuit and using
> alkaline or lithium batteries may explode If charged
>
> On the hp instruments which I have rehabbed from that era most of them
> used nicads with a charger circuit so best advice is replace like with 
> like
>
> Sent from my iPhone
>
> On May 3, 2012, at 12:40 PM, Brooke Clarke <brooke at pacific.net> wrote:
>
> > Hi:
> >
> > Shelf life is the key spec for memory backup batteries.  The worst
> possible type are rechargeable which go dead in a few months.
> > Next best are primary batteries where Alkaline (a few years) is good,
> but newer chemistries like Lithium primary have >> 10 year shelf life.
> > So a computer memory backup battery is the best choice.  The largest one
> that fits the space will have much more capacity than the old battery
> because batteries have improved a lot in the past 10 years.
> > http://www.prc68.com/I/batt.shtml#CC
> >
> > Have Fun,
> >
> > Brooke Clarke
> > http://www.PRC68.com
> > http://www.end2partygovernment.com/Clarke4Congress.html
> >
> >
> > shalimr9 at gmail.com wrote:
> >> The best way is to buy a rechargeable cell pack for cordless phones.
> These are typically made with 3 small NiCad so that they don't mind 
> trickle
> charging and are already safely packaged in shrink tubing with two leads
> and a connector. When the local Lowe's went out of the phone distribution
> market, they sold many of those small battery packs for $1 or $2 and I got
> a few that I have been using for that purpose.
> >>
> >> Didier KO4BB
> >>
> >> ------Original Message------
> >> From: iovane at inwind.it
> >> Sender: time-nuts-bounces at febo.com
> >> To: Time-Nuts
> >> ReplyTo: iovane at inwind.it
> >> ReplyTo: Time-Nuts
> >> Subject: Re: [time-nuts] HP 5334A battery
> >> Sent: May 3, 2012 4:24 AM
> >>
> >>> alanh137 at gmail.com wrote:
> >>>
> >>> My 5334A Service Manual for SERIAL NUMBER PREFIX: 2426A lists the
> following
> >>> battery;
> >>>
> >>> Reference Designation - BT1
> >>> HP Part Number - 1420-0268
> >>> Description - Battery 3.6V .065A-HR NI-CD
> >>> Mfr Code - 28480 (which is Hewlett-Packard)
> >>> Mfr Part Number - 1420-0268
> >>>
> >>> I haven't opened my unit up to make any checks against this data. 
> >>> Hope
> >>> this helps.
> >> Sure, thank you. I think that the fastest way to replace it would be to
> >> assemble three ordinary 1.2V cells.
> >> Regards,
> >> Antonio I8IOV
> >>
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at febo.com
> >> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> >>
> >> Sent from my BlackBerry Wireless thingy while I do other things...
> >> _______________________________________________
> >> time-nuts mailing list -- time-nuts at febo.com
> >> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> >>
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.