QuickBooks needs to run in the background to track your mileage for real-time trip logging, Tim. Once you enable the location, it will automatically detect your driving activities. Let me provide some tips to help conserve your device's battery life and reduce overheating. 

There are various ways to save battery usage and reduce overheating while using the app. Here are the following things you can do:

• Reduce screen brightness or enable the dark theme.
• Close or exit apps running in the background while using QuickBooks.
• Turn on battery optimization.

Additionally, you can choose to activate low-power mode to remove the app from running in the background. 

Moreover, you can consider removing the app's permission, but you'll have to enter the trips manually to record them. Here's how:

1. Open your phone's settings. Scroll down and locate the QuickBooks app.
2. Click the Location, then choose Never.
    

To add your trips manually using the mobile app:

1. Navigate to the Menu icon. Click the Create Trip option.
2. On the Add Trip page, complete the necessary details.

For future reference, here are the following resources that will guide you in using the mileage feature and the process for recording reimbursements:

• Fix mileage tracking issues in the QuickBooks Online mobile app
• Reimburse employees' mileage and vehicle expenses

The recommendations above will help you efficiently manage your mileage tracking while conserving your device's battery life and performance. Should you have additional questions, I'm one post away.