What's going on? Why my hp 250 g3 laptop won't turn on?

We know some of you may find that when you installed the new pack,  the laptop won't turn on. Please kindly note this is not always be our new battery problem. Please do watch the video above, it may shed some light to your situation.

Here is the details of original hp 250 g3 11.1V 2612mAh laptop battery we have:

Voltage: 11.1V
Capacity: 2612mAh (31Wh)
Battery cells: 3-cell
Chemical: Li-ion
Battery Color: black
Condition: new original battery
Warranty: 9 months