Check battery level status

Instead of getting exact battery percentage, you can get battery level status described by device_battery_level_e enum, which gives you practical information about how critical the current battery level is (is the battery full, high, low, critical or empty). 
#include <device/battery.h>
#include <dlog.h> //for logging purposes

device_battery_level_e battery_status = DEVICE_BATTERY_LEVEL_FULL;
if (device_battery_get_level_status(&battery_status) == DEVICE_ERROR_NONE)
{
    if (battery_status == DEVICE_BATTERY_LEVEL_EMPTY ||
        battery_status == DEVICE_BATTERY_LEVEL_CRITICAL ||
        battery_status == DEVICE_BATTERY_LEVEL_LOW )
    {
        LOGI("Battery level is low! Connect the phone to the charger!");
    }
    else
    {
        LOGI("Battery level is OK!");
    }
}
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