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" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
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 <[email protected]> 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 <[email protected]> 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
>
>
> [email protected] 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: [email protected]
>> Sender: [email protected]
>> To: Time-Nuts
>> ReplyTo: [email protected]
>> ReplyTo: Time-Nuts
>> Subject: Re: [time-nuts] HP 5334A battery
>> Sent: May 3, 2012 4:24 AM
>>
>>> [email protected] 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
>>
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>>
>> Sent from my BlackBerry Wireless thingy while I do other things...
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>
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