Capacity remaining simply means the battery is 99% charged, but that's 99% of half of the design capacity of the battery.   And the flashing amber LED almost certainly means either one or more of the cells is dead of old age, or that the mainboard in the battery (the battery control board) is faulty.  
Hi all. This morning an Amber light began to flash continuously on our Dell Inspiron 15 5000 when the cable/charger was plugged in. When removing the cable the computer crashes immediately indicating it will not run on battery power. Does this mean the battery is no good or could there be another problem? Thank you. 
Battery problem