Specification:

Battery type: Li-ion
Voltage:11.55V
Capacity: 6860mAh/79.2Wh
Cell: 6 Cells
recharge cycles： 500
Operation time: Around 1.5-3hours

Replacement Part number:
HSTNN-DB7R KB06XL TPN-Q179 902401-2C1 902499-855 902499-856

Compatible with Machines Model:
For HP Spectre X360 15-BL002XX 15-BL001NG 15-BL075NR Z6K96EA Z6L01EA Z6L02EA 2PG91EA,
For HP Spectre X360 15T-BL00 2017 Series Laptop Battery

How to confirm that the battery is suitable for your laptop?

Method 1: Use System Information to find your laptop model

Step 1: Press Windows + R to open Run window.
Step 2: Input "msinfo32" in the empty box and click OK to open System Information.
Step 3: Keep in the System Summary section, and you will find the System Model item in the right pane.

Method 2: Remove Battery from Laptop to find your laptop battery part number

Step 1: Switch off the laptop and unplug the power cable in case of electric shock
Step 2: Remove the back panel with the screwdriver. You should to this with care avoiding any harm to the laptop components.
Step 3: Disconnect the cable connected to the battery and then take out the battery. After that, you can check the specifications of your battery.