red cross on battery icon

[kf10]

what does red cross on battery icon mean next to clock on taskbar. when i move the mouse over the icon, it says fully charged

 

[manhunter2826]

Normally, it indicates that the battery needs charging but clearly in your case this is erroneous. Take a look here also:
http://www.sevenforums.com/chillout-room/69345-stupid-stupid-laptop-battery.html
http://www.computerworld.com/s/article/9151098/Microsoft_probes_Windows_7_battery_problems

 

[smilodon]

Manhunter is right. It is usually indicative of a battery in need of a charge. Sometimes it can also indicate a battery that cannot hold a charge