Just replace battery cells.You can buy them at http://www.zbattery.com/2100mAh-NiCad-1-2V-Sub-C-Battery-With-Tabs?sc=2&category=1944
OLEG, July 2008
This is not an answer but I know my husband has had much more problems with the chargers than the battery paks themselves. Try them on another charger.
