Pentax Optio E30...Battery Depleted?!?

ITS PROBABLY A LITHIUM ION BATTERY - THEY DO NOT LIKE BEING STORED FLAT AND MAY HAVE DISCHARGED BELOW ITS THRESHOLD POINT - MAKING IT REFUSE TO TAKE ANY FURTHER CHARGING - IT IS ALSO IMPORTANT TO POINT OUT THAT THE LIFEW OF A LITHIUM BATTERY IS 3 YEARS FROM MANUFACTURE WETHER IN USE OR STORED