Answer

There are 3 ways to check battery level.
1. You can check the battery level via MSI Center\Gaming Gear.
2. You can turn on the On-Screen Display function in MSI Center\Gaming Gear to notify you of battery levels
3. You can place the mouse on the dock to check the LED light for current battery level. Green for 70% and above, Yellow for 50%-70%, Orange for 30%-50%, and Red for 30% and below.