Just bought your Hp x2 210 g2? You definitely need a spare battery

When you looking for a replacement battery as spare, you may find this battery is the same to HP Notebook X2 10 battery, they are fully compatible. Also please source the battery according to following part number:859470-121, 859470-1B1, 859470-421, 859517-855,889517-855. Also the battery detail is as below:

Voltage: 7.7V
Capacity: 4221mAh (32.5Wh)
Battery cells: 2-cell
Chemical: Li-Polymer
Battery Color: black
Condition: new original battery
Warranty: 9 months

The battery is available here: https://www.storebattery.co.nz/hp-x2-210-g2-7.7v-4221mah-laptop-battery-store-for-new-zealand-p-199484.html