[NJARC] Building a B Battery for a portable

[William S Zukowski]

Thanks for "keeping me honest" AL :-[

I've used cheap 2032s and name brand (Duracell).  The cheap ones have a 
much shorter life.  Don't know if the price outweighs the life.  I was 
basing my cost estimate using Duracells.

Bill

On 10/9/2018 3:13 PM, Al Klase wrote:
> Just remember
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> _________________________________________________________
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>
> Joe and Bill,
>
> Bill:  I think you have a typo:  " At 190 ma drain they would give you 
> about 900 hours use"  Data sheet says capacity is 235 mAh.  I think 
> you tripped over "0.19 _mA_" on the datasheet.
>
> Surprisingly, my quick calculation for a radio using 1R5, 1T4, 1S5, 
> and 3V4 at 67.5 volts is 19 mA.  That would be 235/19 =12.4 hours.  I 
> thunk that's pretty acceptable.   In bulk there are cheap like 
> 12-cents. EBAY 
> <https://www.ebay.com/itm/100-PCS-CR2032-Lithium-Battery-3V-Button-Cell-Digital-Scales-Calculators-Remote/142719064791?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D20150817211758%26meid%3D7f80520b0c8f4f40b3bca3d8c0ad1cf4%26pid%3D100507%26rk%3D1%26rkt%3D1%26%26itm%3D142719064791&_trksid=p2045573.c100507.m3226>,   
> 23 cells @ $0.12 = $2.76.
>
> If this is the Kent I think it might be, there isn't going to be room 
> for 7 9-volters.
>
> I'd been thinking about using 2032 coin cells for this sort of 
> application, but never tried it.
> My idea is to stack them in a tube, with a spring at one end to 
> provide tension. *Be careful of shorts*, you'll have a *LOT* of 
> current available for a short time!  This is a little scary, could it 
> explode?  Might be a place for a fuse.
>
> Let us know how you make out.
>
> Al
>
> On 10/9/2018 1:06 PM, William S Zukowski wrote:
>> Just remember
>> Reply = Poster
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>>
>> _________________________________________________________
>>
>>
>> Electrically I see no problem.  Might be a bit pricey though, as you 
>> would probably have to use batteries with tabs to enable connecting 
>> them in series, and using twenty three battery holders would require 
>> a "side car".
>>
>> You could use the ubiquitous 2032, which due to modern battery 
>> chemistry would probably out perform the carbon zinc batteries of the 
>> 1960s.  At 190 ma drain they would give you about 900 hours use (not 
>> sure how much the radio draws).  See the attached 2032 data sheet.
>>
>> Bill
>>
>> On 10/9/2018 12:18 PM, Joe Giliberti wrote:
>>> Just remember
>>> Reply = Poster
>>> Reply All = Everyone
>>>
>>> _________________________________________________________
>>>
>>>
>>> Hey Everyone!
>>> I have a Kent 4-tube portable radio that I'd like to get going. It 
>>> uses a D-cell A battery and an Eveready No. 416 67.5 volt B battery. 
>>> Aside from using a voltage booster, what can be used in the small 
>>> space I have available? Would twenty-three 3 volt coin cells in 
>>> series have enough amperage to get it going?
>>>
>>> Thanks
>>> Joe Giliberti
>>>
>>>
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> -- 
> Al Klase – N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
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