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Revisiting 1-Cell Versus 2-Cell Li-Po Batteries
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 Posted: Tue Apr 19th, 2016 05:45 pm
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mwiz64
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Of course the 3-cell battery will last longer than the 2-cell with a voltage booster.


Just look at the thing physically.

One fuel tank is 1/3 larger than the other.


The voltage booster isn't magic...  ;)




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 Posted: Wed Apr 20th, 2016 12:30 pm
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Budd
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I must have had a blonde moment when I posted that original question.  :us:


Wayne from Oz




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 Posted: Wed Apr 20th, 2016 03:02 pm
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mwiz64
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Wayne,

Once long ago, I asked the same question,

and got a similar answer to the one I gave you.




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 Posted: Fri Mar 27th, 2020 05:05 am
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Michael M
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Before I blow myself up...

It's probably here somewhere, but I can't find it.

In very simple words how can I wire two single cell 3.7 volt LiPo batteries in series to get 7.4 volts?

Due to space constraints I can't use a 7.4 volt LiPo.



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Nye, Inyo & Esmeralda Railroad

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 Posted: Fri Mar 27th, 2020 06:54 am
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Rod Hutchinson
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Michael M wrote:
Before I blow myself up...

It's probably here somewhere, but I can't find it. 


In very simple words how can I wire two single cell 3.7 volt Li-Po batteries in series to get 7.4 volts?  

Due to space constraints I can't use a 7.4 volt Li-Po.


The Centre Black Cable Is For Charging Only. 

 The +- For Running.







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 Posted: Fri Mar 27th, 2020 10:12 am
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Helmut
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And don't forget that when you want to charge that,

use a balancing charger by all means !

(it needs the Black 'middle-cable' for this)




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 Posted: Fri Mar 27th, 2020 02:44 pm
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Bob R
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Michael M wrote:
Before I blow myself up...

It's probably here somewhere, but I can't find it.

In very simple words how can I wire two single cell 3.7 volt Li-Po batteries in series to get 7.4 volts?

Due to space constraints I can't use a 7.4 volt Li-Po.


Not sure I understand....

If you have room for two single cell batteries, why not room for a two cell battery?

I mostly use two cell batteries. 
I make up my own, as the two cell packs at hobby store never seem to be what I need.

You can almost always find Li-Pos that fit your space availability. 

In many applications I mount the two cells seperately,
and wire them together to fit in available space. 

I personally do not wire for balance charging, because of the size of connectors. 

I do use battery protection circuits though,
as they afford protection against an individual cell being discharged to low. 

In the many years I have been using Li-Pos I have not had any problems. 


Picture shows a two cell battery with protection circuit I soldered up. 
For size reference the cells are 402035's  which is 4mm thick, 20 x 35mm each
(about 1/8" thick, 3/4"x 1 1/4")







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 Posted: Fri Mar 27th, 2020 03:39 pm
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Michael M
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Bob,

Thanks for the info.


The batteries are going in the cab of the loco,

with one on each side of the cab. 


Using single cell Li-Pos,

I can tuck each one into the corner, and out of sight.


But I want to wire them together to give me 7.4 volts,

and to be able to charge both together.




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 Posted: Fri Mar 27th, 2020 06:52 pm
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Bob R
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Nothing to it. 

This picture is not the best, but you can see a battery on each side of the tank engine.

Both are connected to the battery protection circuit (optional) in the lower left. 

Next to it, the 2 pin charge jack (white connector). 

The other white connector, outside the engine, is the plug to the motor.







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 Posted: Mon May 4th, 2020 12:40 am
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Michael M
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My 3.7 volt Li-Pos finally showed up. 

So now all I have to do is wire them in series and get them installed. 

They should fit inside the cab sidewalls with no problem.




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