Under the Bluetooth accessories section, it will show you the remaining battery percentage, firmware version, and Serial number for your connected Surface Pen.In case you can’t find the app, you can download the Surface app from Microsoft Store. Method 2: Check Surface Pen Serial Number, Firmware Version, and Battery via the Surface appĪnother way to check the Surface Pen battery, as well as its serial number and firmware version, is by using the Surface app. Under the “Mouse, keyboard, & pen” section, you will see the battery percentage of the Surface Pen. Microsoft Surface Pro 6 512GB Core i7-8650U Wi-Fi 16GB 12.3' Black 1796 Serial Number: 042242791053 Status: Used Physical Condition: 3 of 5 Includes: Surface Tablet, AC Power Adapter/Charger Notes:This item is used. Suggested Article How to Connect or Pair Microsoft Surface Penįirst, you need to access Windows Settings by going to Start and click the Gear icon (or by using Win + I shortcut key).