[volt-nuts] volt-nuts Digest, Vol 24, Issue 19

[Brooke Clarke]

Hi David:

Ni-Cad chemistry is very different than Ni-MH.  It's OK to trickle 
charge Ni-Cad but it's a no-no to trickle charge Ni-MH.
You might ask Battery Space if it's OK to use their "smart charger" when 
it's always connected to the battery pack.  Or, if they have them, get 
Ni-Cad packs.

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.End2PartyGovernment.com/


Dave M wrote:
>> Subject: Re: [volt-nuts] Battery pack info for Fluke 731B
>> Message-ID: <4E517BCA.7080103 at pacific.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Hi David:
>>
>> You can buy battery packs ready made or buy individual cells with tabs
>> for easy soldering from:
>> http://www.batteryspace.com/NiCdBatteriesAndPacks.aspx
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>> http://www.End2PartyGovernment.com/
>>
>>
>> Dave M wrote:
>>> I bought a Fluke 731B DC Reference Standard at a hamfest yesterday.
>>> It seems to be working in all functions, but is missing the 10-turn
>>> indicating dial on the front panel, and the battery pack.  I think I
>>> have found a suitable replacement dial from Digikey (Digikey pn
>>> SP015-1-11-ND).
>>> I need to know the voltage and current rating of the battery pack.
>>> Does anyone have any info on the battery?  I know that it's a NiCd
>>> pack, and I suspect that it's a 12-cell pack (14.4V), but that's
>>> just a guess.  The manual just gives Fluke's part number for the
>>> battery; no other data.
>>>
>>> Thanks for helping,
>>> David
>>> dgminala at mediacombb dot net
>>>
>
> Aargh!  I had to cancel the order that I had placed with 
> http://www.batterystation.com because they couldn't put tabs on those 
> cells. Seems that they were a special lot somewhere in a warehouse in 
> the far west that didn't have a welder to attach the tabs.  So, I went 
> to the site that Brooke suggested (batteryspace.com) and ordered two 
> of the 7.2V 1600 maH 2/3A NiMh packs for $12.95 each.  Higher maH 
> rating, plus already assembled into a pack.
> As an afterthought; I'm wondering if I could install a "smart charger" 
> inside the unit to properly charge the battery pack instead of leaving 
> it on trickle charge all the time.  From the schematic, I'm guessing 
> that the unit trickle charges the battery pack at around 10ma.  
> Normally, NiCd and NiMh batteries like to be trickled at 0.1C, which 
> would be 160ma for the battery pack I've ordered.  I doubt that the 
> little power supply in the 731B could handle such a drain.  That's why 
> the thought about installing a smart charger.  Are "smart chargers" 
> quiet or do they emit any EMI or RFI that might conduct to the output 
> of the unit?
>
> Thanks for all the info and advice.
> David
> dgminala at mediacombb dot net
>
>
>
>
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