Essential to the purchase of your new laptop battery is the part number. A part number is a unique identifier that is assigned to a part to simplify referencing and to unambiguously define a part within a single manufacturer. Knowing about part number of the battery will more accessible to buy a correct battery, and it is comparatively accurate to search a battery by its part number than the model name of laptop.
Here is the example of identification via Battery Part Number.
Built-in battery (located inside the laptop)
If your laptop has a built-in non-removable battery, you can try this method to query information about your laptop's battery
1. press Windows key+R or Open Windows Search from the Start menu. Type cmd.
2. Type powercfg /batteryreport at the command prompt and press Enter
3. The battery details are output to a file and saved to your Windows account profile folder. The default location of the profile folder is C:\Users\<account_name>, where <account_name> is Windows account's username. Find and open that output file, which has a file name of battery-report.html or similar.
Below is an example of the battery specifications provided in the battery report generated with the powercfg command.
You can also learn to remove or replace the built-in battery through the video below.