You probably have a basic charger with 3 red/green light indicators . Since you're hooking up a 2 cell, only cell 1 and cell 2 should light up red while charging. cell 3 should always be green since there is no resistence. If you charge a 3 cell 11.1v battery, the light for cell1,2,3 will all light red when charging. All green indicates done charging
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