New (Apple Original) battery not recognised on my MacBook

My laptop has not been charging at all, and shuts down immediately when charging cable is unplugged.

I have just bought a new battery, thinking that the 5-year old battery needed replacement.

However battery is still not charging, In fact, it seems that it is not even recognised, saying that no battery is installed!

Any help with this would be greatly appreciated.

Thanks, Maria

This is what I get in 'About this Mac' - Power

Battery Information:

Charge Information:

Charge remaining (mAh): 0

Fully charged: No

Charging: No

Full charge capacity (mAh): 0

Health Information:

Cycle count: 0

Battery Installed: No

Amperage (mA): 0

Voltage (mV): 0

System Power Settings:

AC Power:

System Sleep Timer (Minutes): 0

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 20

Automatic Restart On Power Loss: No

Wake On AC Change: No

Wake On Clamshell Open: Yes

Wake On LAN: Yes

Display Sleep Uses Dim: Yes

Battery Power:

System Sleep Timer (Minutes): 5

Disk Sleep Timer (Minutes): 10

Display Sleep Timer (Minutes): 1

Wake On AC Change: No

Wake On Clamshell Open: Yes

Display Sleep Uses Dim: Yes

Reduce Brightness: Yes