what should you do when you use a Acer predator triton 300 se pt314-51s for the first time?

Before you use a battery pack for the first time, there is a conditioning process that you should follow:

1. Connect the AC adapter and fully charge the battery.
2. Turn on the computer and complete setting up the operating system.
3. Disconnect the AC adapter.
4. Operate the computer using battery power.
5. Fully deplete the battery until the battery-low warning appears.
6. Reconnect the AC adapter and fully charge the battery again.

 

The above sources from official manual. 

Acer predator triton 300 se pt314-51s battery

Brand new acer predator triton 300 se pt314-51s 15.48V 3886mAh laptop batteries
    

    Price: 109 NZD
    Voltage: 15.48V
    Capacity: 3886mAh (60Wh)
    Battery cells: 4-cell
    Chemical: Li-Polymer
    Battery Color: black
    Condition: new original battery
    Warranty: 9 months
   
You may have more details about the battery here: https://www.storebattery.co.nz/acer-predator-triton-300-se-pt314-51s-15.48v-3886mah-laptop-battery-store-for-new-zealand-p-460292.html

On sale: Hp stream 11-d000na 7.6V 4810mAh laptop battery for New Zealand

To reduce potential safety issues, use only the battery provided with the computer, a
replacement battery provided by HP, or a compatible battery purchased from HP.
 

When a charged battery is in the computer and the computer is not plugged into external power, the computer runs on battery power. When the computer is off and unplugged from external power, the battery in the computer slowly discharges. The computer displays a message when the battery reaches a low or critical battery level.
 

Computer battery life varies, depending on power management settings, programs running on the computer,screen brightness, external devices connected to the computer, and other factors.
 

NOTE: When you disconnect external power, the display brightness is automatically decreased to conservebattery charge. Select computer products can switch between graphic controllers to conserve battery charge.

 

The above sources from official manual.

Hp stream 11-d000na battery

Brand new hp stream 11-d000na 7.6V 4810mAh laptop batteries

    Voltage: 7.6V
    Capacity: 4810mAh (37Wh)
    Battery cells: 2-cell
    Chemical: Li-ion
    Battery Color: black
    Condition: new original battery
    Warranty: 9 months

You can also have more information here: https://www.storebattery.co.nz/hp-stream-11-d000na-7.6v-4810mah-laptop-battery-store-for-new-zealand-p-362432.html