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Old Mar 03, 2002, 07:57 PM
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United States, CO, Longmont
Joined Jul 2001
2,871 Posts
James. Batteries that are NiCad or NiMAH need more voltage to charge than the 1.2 operating volts might lead you to think. You really can't get them to charge well unless your charger puts out about 1.55 to 1.60 volts/cell or more. Starting with your 12 volt regulated supply, your charger (which has some internal voltage drop, likely can not put out enough volts. This may have lead you to try to get more from the batteries than they had to offer and in turn overdischarged them. This may have damaged them, but even if not, you likely can't get 'em recharged properly. Try a higher supply voltage before giving up.

Regards,
Q
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