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Old Jun 3, 2003, 1:11 PM   #1
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Default How to discharge NiMh batteries?

Is it good to charge the NiMh battery when the battery indicator
shows low? I think I'd better fully discharge it and re-charge.
But how to fully discharge? Thanks.
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Old Jun 3, 2003, 1:28 PM   #2
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The NiMh batteries do not have a memory similar to NiCd batteries. You can buy a battery with a reconditioning mode, the Maha 204 has this ability, that can discharge then recharge the batteries.
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Old Jun 3, 2003, 1:29 PM   #3
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Some chargers have a feature to do this ( conditionning cycle)

Or, you can make a simple circuit to drain the battery at a reasonnable rate , let say 100 mA, and cut of at about 1 Volt ...
(with all reserve about thoses values )
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Old Jun 3, 2003, 5:43 PM   #4
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Torch bulb in series with a silicon diode for one cell: Will stop discharging at about 0.7Volt.
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Old Jun 3, 2003, 9:23 PM   #5
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The literature that I have read on NiMh bats indicates that it is ok to keep the batteries 'topped off'. Which is opposite to what is advised with NiCd chemistry batteries.

I generally recharge my batteries when the camera's inditcatior first signals low charge (unless I absolutely need to keep shooting or don't have fresh replacements with me). Then maybe once every couple of months I let the MAHA 204 do a conditioning discharge cycle before recarging the batteries.

So far all of my NiMh batteries (Powerex, Sony, and Kodak) seem to be happy with this treatment.
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Old Jun 4, 2003, 12:22 AM   #6
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Quote:
Originally Posted by voxmagna
Torch bulb in series with a silicon diode for one cell: Will stop discharging at about 0.7Volt.
This is a simple but very good way
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Old Jun 4, 2003, 9:45 PM   #7
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Thanks for all the response!

I heard that some charges have the 'recondition' fuction,
which sounds better to me.

Thanks again!
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