The battery status indicator displays the different states of the battery as represented by icons in the right corner of the Device Status area, including: The monitor is connected to a power outlet and the battery is charging or is fully charged. The estimated charge rate is displayed as a percentage of capacity. The monitor is not connected to a power outlet and is running on battery power. The estimated charge time remaining is displayed in the hour(s): minute(s) format. Each section of the battery status indicator represents a percentage of remaining charge. The monitor is connected to a power outlet but the battery does not maintain a charge (or has been removed). When the battery is not being recharged and power becomes low, a low level alarm appears in the Device Status area. (Note: Observe the remaining battery charge in the battery status indicator and plug the monitor into a power outlet as soon as you are able.) If the low level alarm is dismissed or if you take no action to charge the battery, a high-priority alarm appears when battery power is critically low. Plug the monitor into a power outlet immediately to prevent it from shutting down.