Replace The Battery?

Afternoon all, please find my battery specs below.

Model Information:

Serial Number: 9G02404N9E1MA

Manufacturer: DP

Device name: bq20z451

Pack Lot Code: 0000

PCB Lot Code: 0000

Firmware Version: 0201

Hardware Revision: 0002

Cell Revision: 0158

Charge Information:

Charge remaining (mAh): 0

Fully charged: Yes

Charging: No

Full charge capacity (mAh): 0

Health Information:

Cycle count: 1076

Condition: Replace Now

Battery Installed: Yes

Amperage (mA): 0

Voltage (mV): 12381

The battery obviously needs replacing, and I was just wondering, where could I purchase a replacement battery, and how would I go about fitting it ?