I am charging a battery with the Canon CB-2LT charger (provided with Rebel XT/350D, Powershot S50, etc). The light on the charger was initially red, as expected, but after a few minutes it started blinking alternatively red and green. Does anybody know what it means? Accordingly to the Rebel XT manual, once the battery is charged, the light should be green. I have put the same battery on a different charger (still the Canon CB-2LT), and the light blinks alternatively red and green on that as well. Contrariwise, a different battery on those chargers does not bring about the same behavior. Any clue?