[NJARC] Building a B Battery for a portable

[Al Klase]

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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