M18x-R2, replacement battery

Hi,

I'm looking for a new battery for mx18 (R2). Any ideas where I might be able to find one on the Dell/Alienware website?

Many thanks

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Microsoft ACPI-Compliant Control Method Battery
Battery Name:     PABAS0241231
Manufacturer Name:     SIMPLO
Type:     Li-I - Lithum Ion
Battery Serial Number:     41167
Designed Capacity Percentage:     10
Current Charge Percentage:     100
Current Charge:     8.38 Wh
Full Charged Capacity:     9.28 Wh
Designed Capacity:     96.01 Wh
Voltage:     16.55 V
Battery Life Test
Test Started        9/17/2016 6:32:25 PM
Error Message:     Battery charging to only 9.67% of design capacity. Battery should be replaced.    9/17/2016 6:32:26 PM
Test Finished:     Failed (Error code: WBT02-QWN)    9/17/2016 6:32:28 PM