Taken from http://www.greenbatteries.com/documents/Battery_FAQ.htm
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If a NiCd battery is repeatedly charged after it has only been partially discharged it will develop a lower voltage and a lower capacity. Fortunately, this effect is reversible by conditioning NiCds. Conditioning is simply fully discharging the battery (down to about 1.0 V per cell) after charging it. If a full discharge followed by a charge cycle is done several times, a battery suffering from voltage depletion (voltage depression, memory effect, or whatever you would like to call it) should be restored back to it's normal voltage and capacity.
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This apparently applies to NiMH and Li+ batteries, too, though these types of batteries suffer from the "memory effect" to a much smaller degree than do NiCd's
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