Same Q from here:
[SOLVED] - Is it safe to replace laptop battery with lower Wh one?
My laptop battery died which was 15.4V 70.07 Wh(Nom:4550mAh). Is it safe to replace it with a 15.4V 67.76Wh 4400mAh battery?forums.tomshardware.com
Is this replacement an official one from the manufacturer?
Be very very careful about 3rd party batteries.Sorry I'm new to this forum.
No, the replacement is not official.