Managing battery level

When the App is started, the GPS is running to get information about the activity. When the GPS is enabled, the battery level decreases of nearly 5% per hour. On the first page, the battery level is displayed, The color of the battery changes at level 50% and 30%.

In the case the battery level is below 25% and the App is started, this one is stopped. It is no possible to restart the App. It is required to load the battery to start again.