This is a generic, equivalent one, 100% compatible. This 3.8V 3000mAh Replacement Li-ion battery is designed to compatible with Nokia Microsoft 640 XL.

Specifications:
* Product Type: generic/equivalent
* Battery Voltage: 3.8V
* Battery Capacity: 3000mAh
* Condition: new, 1 Year Warranty!
* Easy Installation
* Battery is tested accurately before shipping
* Compound Li-ion Chip, Safer and More Reliable

Compatible Part Numbers:
BV-T4B

Compatible Model:
For Nokia Microsoft 640 XL