In original packaging item, may require some assembly. See link for more details:

Size: 51.3Wh 

For Gateway GWTC71427 Series 11.4V 4500mAh

Note: Cannot test due to electronic requirements. 7 days to return if does not function. See pictures for details.

https://www.amazon.com/Mobik-5085258P-Battery-Replacement-GWTC71427/dp/B0F93ZMGS8/ref=sr_1_1