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Minimum discharge voltage NiCd and NiMH

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Old 03-13-2018, 10:34 AM
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Default Minimum discharge voltage NiCd and NiMH

I used an AccuCycle to cycle my batteries for many years until it died. It would cycle NiCd and NiMH batteries down to 1.05 volts/cell. Bought a Hitec X2 charger than has a resolution of 0.1 volt. So, do I set the minimum voltage to 1.0 V/cell or 1.1 V/cell?

When the battery capacity is stated, what voltage do they discharge to?

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Old 03-13-2018, 04:46 PM
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I always discharge to 1.0 V per cell. The discharge curve is steeply sloped below 1.0 volt, so very little energy is left within the cell. Going below 1.0 volt would risk reverse charging one of the cells in the pack. Stopping at 1.1 V/cell would leave a much larger portion of the charge.

I don't know what manufacturers use for their capacity measurements. I suppose 0 V/cell as this would be most favorable to them. That is OK to do on a single cell, but not on a battery pack.

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Old 03-16-2018, 09:27 AM
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As stated above, there is very little difference between 1.0 and 1.1 v/cell. At that point the discharge curve is very steep making any difference negligible. Use whatever value is convenient. I use 1.0 because I'm old and its easy to remember.
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Old 03-16-2018, 12:55 PM
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A. J. Clark
 
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1.0 or 1.1 v/cell should be a good cutoff voltage . Myself I use 1.1 v/cell. I keep a log of all my battery capacities. When the pack gets down close to 75% of what it was when new I think about a new pack.
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Old 03-16-2018, 01:04 PM
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Just for grins, and because I'm an engineer, I decided to check it out. Battery is a Sanyo KR-1500SC. Ran two discharge/charge cycles each time with different end voltages. At 1.0 V, get a capacity of 2041 mAhr. At 1.1 V, capacity is 1355 mAhr. Quite a difference!
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Old 03-17-2018, 04:56 AM
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0.9 V this is the recommended voltage, lower is not allowed ....
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