Select the UA Sync icon in the upper right hand corner of the dashboard. If your headphones are connected, they will appear under "My Apps and Devices". Tap on "UA Sport Wireless Heart Rate" and you will see your headphones settings. Your headphones' battery life appears in the top left corner. If you have an IOS device, you also will be able to see the battery life indicator in the upper right hand corner next to the BT symbol. Additionally, you should hear the audible voice stating ‘low battery’ when you have 15-20 minutes left of battery life left on the headphones.