On 9/1/21 4:58 AM, Lasse Langwadt Christensen wrote:
> onsdag den 1. september 2021 kl. 04.22.08 UTC+2 skrev Carl:
>> On 8/31/21 5:39 PM, Lasse Langwadt Christensen wrote:
>>> tirsdag den 31. august 2021 kl. 23.22.14 UTC+2 skrev Tabby:
>>>> On Tuesday, 31 August 2021 at 14:39:26 UTC+1, Ralph Mowery wrote:
>>>>> In article <0c1be23f-b5fa-4caa...@googlegroups.com>,
>>>>>> On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
>>>>>>> On 31/08/2021 01:09, Tabby wrote:
>>>>>>>> Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
>>>>>>> https://en.wikipedia.org/wiki/List_of_battery_sizes
>>>>>>>
>>>>>>> Lookup A412 - 22.5V. I think this was a size used in some AVOs.
>>>>>>>
>>>>>>> HTH
>>>>>>
>>>>>> Yes, cheers. I guess 3x PP3 might be a better option now.
>>>>>>
>>>>>>
>>>>> I have a few pieces of older gear that takes batteries that are no
>>>>> longer on the market. If there is room I use a 9 volt battery and one
>>>>> of the boost converters from China. You can get them to boost or lower
>>>>> (buck) the voltage.
>>>> I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
>>>
>>> https://www.banggood.com/Geekcreit-3_7V-9V-5V-2A-Adjustable-Step-Up-18650-Lithium-Battery-Charging-Discharge-Integrated-Module-p-1264852.html
>>>
>>> and a LiPo battery
>>>
>> That has a minimum input of 5V so a single 3.7V Li isn't going to do.
>
> it is literally designed for a single 3.7V Li, the 4.5-8V input is for the charger
>
Sigh, you are right of course.
--
Regards,
Carl Ijames
Reply by Lasse Langwadt Christensen●September 1, 20212021-09-01
onsdag den 1. september 2021 kl. 04.22.08 UTC+2 skrev Carl:
> On 8/31/21 5:39 PM, Lasse Langwadt Christensen wrote:
> > tirsdag den 31. august 2021 kl. 23.22.14 UTC+2 skrev Tabby:
> >> On Tuesday, 31 August 2021 at 14:39:26 UTC+1, Ralph Mowery wrote:
> >>> In article <0c1be23f-b5fa-4caa...@googlegroups.com>,
> >>>> On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
> >>>>> On 31/08/2021 01:09, Tabby wrote:
> >>>>>> Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
> >>>>> https://en.wikipedia.org/wiki/List_of_battery_sizes
> >>>>>
> >>>>> Lookup A412 - 22.5V. I think this was a size used in some AVOs.
> >>>>>
> >>>>> HTH
> >>>>
> >>>> Yes, cheers. I guess 3x PP3 might be a better option now.
> >>>>
> >>>>
> >>> I have a few pieces of older gear that takes batteries that are no
> >>> longer on the market. If there is room I use a 9 volt battery and one
> >>> of the boost converters from China. You can get them to boost or lower
> >>> (buck) the voltage.
> >> I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
> >
> > https://www.banggood.com/Geekcreit-3_7V-9V-5V-2A-Adjustable-Step-Up-18650-Lithium-Battery-Charging-Discharge-Integrated-Module-p-1264852.html
> >
> > and a LiPo battery
> >
> That has a minimum input of 5V so a single 3.7V Li isn't going to do.
it is literally designed for a single 3.7V Li, the 4.5-8V input is for the charger
Reply by Carl●August 31, 20212021-08-31
On 8/31/21 5:39 PM, Lasse Langwadt Christensen wrote:
> tirsdag den 31. august 2021 kl. 23.22.14 UTC+2 skrev Tabby:
>> On Tuesday, 31 August 2021 at 14:39:26 UTC+1, Ralph Mowery wrote:
>>> In article <0c1be23f-b5fa-4caa...@googlegroups.com>,
>>>> On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
>>>>> On 31/08/2021 01:09, Tabby wrote:
>>>>>> Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
>>>>> https://en.wikipedia.org/wiki/List_of_battery_sizes
>>>>>
>>>>> Lookup A412 - 22.5V. I think this was a size used in some AVOs.
>>>>>
>>>>> HTH
>>>>
>>>> Yes, cheers. I guess 3x PP3 might be a better option now.
>>>>
>>>>
>>> I have a few pieces of older gear that takes batteries that are no
>>> longer on the market. If there is room I use a 9 volt battery and one
>>> of the boost converters from China. You can get them to boost or lower
>>> (buck) the voltage.
>> I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
>
> https://www.banggood.com/Geekcreit-3_7V-9V-5V-2A-Adjustable-Step-Up-18650-Lithium-Battery-Charging-Discharge-Integrated-Module-p-1264852.html
>
> and a LiPo battery
>
That has a minimum input of 5V so a single 3.7V Li isn't going to do.
Several years ago I used one of these:
https://www.ebay.com/itm/142660988578 "DC-DC Auto Boost Buck step Up
step down Converter Module Solar Voltage LM2577" so I could use a single
18500 Li Ion rechargeable to replace a pair of AAA cells. The input
ranged from 3.7ish down to 2.7ish as the Li Ion cell discharged (beating
the input spec of 3.0V so I was happy) while the output stayed stable at
3.0V where I set it. No, the board and cell didn't fit where the AAA's
did, but I was tired of recharging NiMH AAA's every morning after a
night of logging pulse and pO2. Anyway, there might be a more
modern/cheaper version available now. Oh, the output spec is 1-30V and
I chose this model because the input and output ranges can overlap, but
with your 22.5V output that isn't a consideration, you just have to find
the room for the little board and an 18650 Li cell (unless you want to
run it from a 2032 :-)).
--
Regards,
Carl Ijames
Reply by Ralph Mowery●August 31, 20212021-08-31
In article <e2683d29-15d4-45ca-b9a2-9130bd83e277n@googlegroups.com>,
tabbypurr@gmail.com says...
> >
> > I have a few pieces of older gear that takes batteries that are no
> > longer on the market. If there is room I use a 9 volt battery and one
> > of the boost converters from China. You can get them to boost or lower
> > (buck) the voltage.
>
> I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
>
>
It all depends on how much room you have. I don't recall how much but
some boost converters have a minimum input voltage. I did use 4 AA
batteries in a device that had plenty of room and a boost converter.
Not counting the loss for efficency I have found the converters to be
almost like a transformer. The power out is about equal to the power
in, so if going from a low vlotage to a high voltage you draw more
current and if going from a high voltage to a low voltage you draw less
courrent.
Reply by Lasse Langwadt Christensen●August 31, 20212021-08-31
tirsdag den 31. august 2021 kl. 23.22.14 UTC+2 skrev Tabby:
> On Tuesday, 31 August 2021 at 14:39:26 UTC+1, Ralph Mowery wrote:
> > In article <0c1be23f-b5fa-4caa...@googlegroups.com>,
> > > On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
> > > > On 31/08/2021 01:09, Tabby wrote:
> > > > > Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
> > > > https://en.wikipedia.org/wiki/List_of_battery_sizes
> > > >
> > > > Lookup A412 - 22.5V. I think this was a size used in some AVOs.
> > > >
> > > > HTH
> > >
> > > Yes, cheers. I guess 3x PP3 might be a better option now.
> > >
> > >
> > I have a few pieces of older gear that takes batteries that are no
> > longer on the market. If there is room I use a 9 volt battery and one
> > of the boost converters from China. You can get them to boost or lower
> > (buck) the voltage.
> I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
On Tuesday, 31 August 2021 at 14:39:26 UTC+1, Ralph Mowery wrote:
> In article <0c1be23f-b5fa-4caa...@googlegroups.com>,
> > On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
> > > On 31/08/2021 01:09, Tabby wrote:
> > > > Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
> > > https://en.wikipedia.org/wiki/List_of_battery_sizes
> > >
> > > Lookup A412 - 22.5V. I think this was a size used in some AVOs.
> > >
> > > HTH
> >
> > Yes, cheers. I guess 3x PP3 might be a better option now.
> >
> >
> I have a few pieces of older gear that takes batteries that are no
> longer on the market. If there is room I use a 9 volt battery and one
> of the boost converters from China. You can get them to boost or lower
> (buck) the voltage.
I was just wondering about that, but with a 1.5v cell. 9v batteries are a lot more bucks per watthour.
Reply by Ralph Mowery●August 31, 20212021-08-31
In article <0c1be23f-b5fa-4caa-bbab-b681955b651an@googlegroups.com>,
tabbypurr@gmail.com says...
>
> On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
> > On 31/08/2021 01:09, Tabby wrote:
> > > Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
> > https://en.wikipedia.org/wiki/List_of_battery_sizes
> >
> > Lookup A412 - 22.5V. I think this was a size used in some AVOs.
> >
> > HTH
>
> Yes, cheers. I guess 3x PP3 might be a better option now.
>
>
I have a few pieces of older gear that takes batteries that are no
longer on the market. If there is room I use a 9 volt battery and one
of the boost converters from China. You can get them to boost or lower
(buck) the voltage.
Reply by Tabby●August 31, 20212021-08-31
On Tuesday, 31 August 2021 at 01:54:20 UTC+1, Mike Perkins wrote:
> On 31/08/2021 01:09, Tabby wrote:
> > Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.
> https://en.wikipedia.org/wiki/List_of_battery_sizes
>
> Lookup A412 - 22.5V. I think this was a size used in some AVOs.
>
> HTH
Yes, cheers. I guess 3x PP3 might be a better option now.
Reply by Phil Allison●August 30, 20212021-08-30
Mike Perkins wrote:
=================
>>
> Lookup A412 - 22.5V. I think this was a size used in some AVOs.
** That the one that looks like a 9V batt with terminals on each end?
IOW the old style hearing aid batt.
... Phil
Reply by Mike Perkins●August 30, 20212021-08-30
On 31/08/2021 01:09, Tabby wrote:
> Is there an 18v battery about the size of a C cell? A zener tester, probably 1970s, that goes upto 17v max, takes what looks like a single C cell. There is no circuitry that could up the v as far as I can tell.