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 Posted: Mon Mar 22nd, 2021 03:24 am
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Si.
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" and the other only about 24mV "


Hi Michael  :!::mex:


I've never seen ANY battery cell measure 24mV EVER !  :us:


I think it could be, the wiring, or battery connector, is damaged ...  :f:

... & perhaps then that cell, as a result, is appearing 'open-circuit'.  L:


Hence, red light on the charger & the CRAZY low 24mV on the meter.  :shocked:

Could be worth checking all the wiring continuity is OK.  L:


:java::moose:


Si.




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 Posted: Mon Mar 22nd, 2021 03:39 am
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Michael M
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Si,

Wiring checks out okay.
I'm thinking a bad cell. 

Reminds me of when I got that bad FlySky transmitter,
and thought it was something I was doing wrong.


Bob,

I've got a Venom 7.4v that I was going to use to swap with the bad Li-Po. 
Don't see anything about it having a protection circuit.

It's probably been discussed before,
but where/how do you install a protection circuit?




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 Posted: Mon Mar 22nd, 2021 04:01 am
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Si.
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Hi Michael  :!::mex:


I must have missed this "bad transmitter" experience.  :us:


I do remember you having some oDd wiring on a receiver though ...  L:

... we went through the fault finding process, very carefully.


I find generally problems are 95% human factor & 5% parts.  ;)

Especially if that part was either brand new, or working OK previously.


At which point I'm gonna shut up !  :P

24mV ?  :us:


Outta here .   .    .     .      :slow:


:moose: :dt:


Si.




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' Mysterious Moose Mountain ' - 1:35n2 - pt.II
http://www.freerails.com/view_topic.php?id=7318&forum_id=17&page=1

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
http://www.slotforum.com/forums/index.php?showtopic=59295&st=0&a
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 Posted: Mon Mar 22nd, 2021 11:06 am
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Chris Morris
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I found with Li-Po type of batteries that have duff cells,
putting them on a normal battery charger, at the right voltage,
on the duff cell only, for about 5 minutes maximum,
can bring them back to life.

But then put them on the correct charger.

I switch my charger to Ni-Cd,
give it a few minutes into a Li-Po.




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 Posted: Mon Mar 22nd, 2021 11:43 am
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Bob R
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Chris is correct. 

I was reluctant to suggest this,
as it would be considered by some to be dangerous.

I have revived many cells over the years,
by a short charge on Ni-Cd or Ni-Mh settings.

Essentially you charge just long enough to bring the battery voltage to 3 volts. 
Then the Li-Po charger will recognise the cell and charge it normally.


Battery protection circuits can be found on eBay for less than $2. 
I usually order in lots of 10 from China. 

Pictured is a small 250 mAh 2 cell battery with protection circuit. 
You may note that each cell has a single cell protection circuit. 

I usually remove those before wiring to the 2 cell circuit.

I also buy the batteries from eBay. 
Ten will cost about $20. 







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 Posted: Mon Mar 22nd, 2021 11:51 am
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Bob R
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This battery has just the 2 cell protection circuit.







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 Posted: Mon Mar 22nd, 2021 12:04 pm
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Bob R
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Another option which I think is great is using a single Li-Po cell, or two in parallel,
and a 'Pololu' step-up voltage regulator, to boost the voltage to 9 or 12 volts. 

I find 9 volts to work best with most engines. 


The regulators are about 1/2 the size of the protection circuit. 

Simpler charger needed, no balance problems, they require 3 volts to operate,
so low voltage protection of the battery is "built in". 


Picture is a HOn3 with single cell, 'Pololu' and DelTang receiver.







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 Posted: Mon Mar 22nd, 2021 08:51 pm
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Helmut
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There is another possible solution in case a 'can-type' motor is used,
replace it by a 3V version.

Most of the motors used in today's models can be had in that variant, too.




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 Posted: Wed May 12th, 2021 06:17 pm
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Randy Decker
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OK, you've all got me totally fascinated here. 
Randy

      

Last edited on Wed May 12th, 2021 07:27 pm by Randy Decker

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 Posted: Thu May 13th, 2021 12:13 am
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Bob Walker
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Battery power for almost all gauges of model trains is mow at a pretty mature state. Proper battery recharging practices and protocols need to be further worked on.

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