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Old 12-01-2007, 11:56 PM   #1
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Default Help with Battery Charging - NIMH/NICAD

I went to charge my nimh's and they had been sitting in the cupboard for a while (gone flat) and went to charge and they will get around 70mah and then will come up saying "to high voltage" and stops charging. Can this be fixed or are the batteries stuffed?
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Old 12-02-2007, 12:02 AM   #2
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I went to charge my nimh's and they had been sitting in the cupboard for a while (gone flat) and went to charge and they will get around 70mah and then will come up saying "to high voltage" and stops charging. Can this be fixed or are the batteries stuffed?
You need to describe the mahr of the nimh's and how long "for a while" is.

If they are 4200s and it has been a month or more..."stuffed" likely applies.
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Old 12-02-2007, 12:10 AM   #3
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They are 3000, 3200, 3400 etc. there no full racing type batteries and would be about 3 months, maybe a bit more
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Old 12-02-2007, 12:45 AM   #4
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They are 3000, 3200, 3400 etc. there no full racing type batteries and would be about 3 months, maybe a bit more
Try a voltmeter across each cell and look for 0 volts. That should tell you.
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Old 12-02-2007, 01:18 AM   #5
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high internal resistance will result in higher voltage when charging, so the total volatge is higher than what it should normally be.

throw the cells out there useless.
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Old 12-02-2007, 01:24 AM   #6
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What causes it?
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Old 12-02-2007, 02:25 AM   #7
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usually happens to old IB and EP's ) when they have been sitting around for longer than a few months. they like to be used weekly to keep IR low.

or cheap shit ebay chines batteries. i bought 8 aa chinese batt for my tx from ebay. soldered them together they peaked at 15+V, when they should peak at 1.55v each or 12.v for the entire pack.
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Old 12-02-2007, 02:38 AM   #8
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Yeah I would of had these batteries for around 3 years now. Does it also happen to nicad?
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Old 12-02-2007, 03:47 AM   #9
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nicads are more resiliant.

you can try set a delta peak "lock out period" 15 minutes or so, and cycle them a few times.
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