If the battery flashes, it's saying charge me. If the charger is green it's saying your already charged. So it could be either of them that is not telling the truth.
If you can put the battery onto a different charger, that will then tell you which one is not telling the truth.
The chargers do break as well as the batteries.
And yes you where unlucky I think. I've been using the same pair of ego 1100man batteries for 4 months now, and they get hammered day in day out.
Having said that they'll probably croak on me now.