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PL6 and NiMh batteries

Old 12-19-2015, 12:52 AM
  #1  
Derek Morton
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Default PL6 and NiMh batteries

I am trying to cycle a range of NiMh batteries.
I am using the NiMh Preset 21 from the menu.
The termination is shown at NiCd.

I cannot cycle these batteries as 3 different manufacturers batteries fail with what appears to be early termination.

Am I doing anything wrong?

All of the batteries charge ok on a MAha Powerex charger and work fine under load.

Last edited by Derek Morton; 12-19-2015 at 01:01 AM. Reason: extra information
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Old 12-19-2015, 08:45 AM
  #2  
Gregor
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If its terminating early during the charge cycle, its possible the cells need to go through a forming cycle. If its terminating early on the discharge, it could be because the discharge current is too high and there is significant voltage drop across the wires.

If you are mixing cells in cell holder and charging them together, its possible the cells are a different states of charge. The charger terminates when fallback voltage is detected. It may trigger one or more cells reaches the fully charged state. If you have the FUIM3, you can chart the fallback voltage. That will give you a little more insight into what is going on.

To perform a forming charge, charge the pack at slow rate, about 100ma-200ma. This will take about 12 to 14 hours.
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Old 12-19-2015, 10:00 PM
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Derek Morton
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Let me say again:-

I am using the NiMh Preset 21 from the menu.
The termination is shown as NiCd.

Last edited by Derek Morton; 12-19-2015 at 10:00 PM. Reason: spelling
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Old 12-19-2015, 11:25 PM
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Gregor
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Originally Posted by Derek Morton View Post
Let me say again:-

I am using the NiMh Preset 21 from the menu.
The termination is shown as NiCd.
That is the correct preset for NiMh cells. Depending on details of your issues, you many need to tune the settings, change the way you are connecting to the charger, or run through a forming charge (preset #22). More details about the failure would help me narrow down what you need to do to move forward.
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Old 12-20-2015, 02:31 AM
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Derek Morton
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Hi Gregor,

The charge or discharge stop after 5mah.
Starting again does the same thing.

Starting a forming run on a single cell now.
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Old 12-20-2015, 03:10 AM
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Gregor
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Sounds good. One thing to be aware of. The internal discharge circuit has a minimum voltage of 3v. So you will need at least a 3s pack to discharge each cell down to 1v. You can use regenerative discharge mode if want to discharge 1s, or 2s NiXX.


After the forming charge, I would discharge at 500ma to help reduce voltage drop of the connections.
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Old 12-20-2015, 03:13 AM
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Derek Morton
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my first test battery is a 1300mah Duracell aa
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Old 12-19-2015, 10:23 PM
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Gregor
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What is the failure? Is happening during charge or discharge?
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