diff --git a/circuitpython/code/main.py b/circuitpython/code/main.py
index 18d0822..81b1eac 100644
--- a/circuitpython/code/main.py
+++ b/circuitpython/code/main.py
@@ -199,10 +199,11 @@ class Data:
         """Save the current data as csv file on SPI flash"""
         try:
             with open("data/data.csv", "a") as csv_file:
-                csv_file.write("{};{};{};{}\n".format(self.data['SYS']['time'],
+                csv_file.write("{};{};{};{};{}\n".format(self.data['SYS']['time'],
                                                       self.data['BME']['temp'],
                                                       self.data['BME']['hum'],
-                                                      self.data['BME']['press']))
+                                                      self.data['BME']['press'],
+                                                      self.data['SYS']['vbat']))
         except OSError as e:
             print("Err {}: readonly".format(e))
             backup_data = False      #to avoid trying again till next reset
@@ -356,7 +357,7 @@ while True:
         last_written_data = current
         print("Backup data...")
         data.write_on_flash()
-    
+
         gc.collect()
         # micropython.mem_info(1)
         # print('Memory free: {} allocated: {}'.format(gc.mem_free(), gc.mem_alloc()))