Laptop works with AC adoptor but power LED blinking. On removal of the Power Jack, the battery condition icon shows a cross mark over the fully discharged battery. After removal of and re-installation of battery, the power LED glows (with AC adoptor connected), but after few secs, starts blinking again.
Is it a symptom for bad battery / bad power circuits / Bad Days Ahead.
It is probably because the circuit that disperses power to the battery for charging has gone bad. That is why it runs properly with AC power, but the battery is getting absolutely no charge. Even if the battery was no longer holding a charge, it shouldn't be fully discharged instantly after charging.