what does the dell latitude e5550 charging light mean?

The above is from official manual, it shows what charging light color means. If it is proved that the battery is not working, please don't forget that we have dell latitude e5550 battery in stock, the detail is as below and we can ship it to all over the world. 

dell latitude e5550 bateria

dell latitude e5550 11.1V 38Wh 4-ogniw bateria do laptopa,

Marki: oryginał dell

Bateria Napięcie: 11.1V
Pojemność: 3454mAh (38Wh)
Technologia Ogniw: litowo-polimerowa
Baterii Kolor: czarny
Kompatybilne: Dell latitude e5550
Gwarancja: 9 miesięcy