diff --git a/Software/src/datalayer/datalayer.h b/Software/src/datalayer/datalayer.h
index 6d6be61c..bfb57ad3 100644
--- a/Software/src/datalayer/datalayer.h
+++ b/Software/src/datalayer/datalayer.h
@@ -71,8 +71,11 @@ typedef struct {
   /** A counter that increases incase a CAN CRC read error occurs */
   uint16_t CAN_error_counter;
   /** uint8_t */
-  /** A counter set each time a new message comes from battery.*/
-  uint8_t CAN_battery_still_alive = 12;
+  /** A counter set each time a new message comes from battery.
+   * This value then gets decremented each 5 seconds. Incase we reach 0
+   * we report the battery as missing entirely on the CAN bus.
+   */
+  uint8_t CAN_battery_still_alive = CAN_STILL_ALIVE;
 
   /** Other */
   /** The current BMS status */
diff --git a/Software/src/devboard/utils/types.h b/Software/src/devboard/utils/types.h
index 78c354af..85525166 100644
--- a/Software/src/devboard/utils/types.h
+++ b/Software/src/devboard/utils/types.h
@@ -28,6 +28,7 @@ enum led_color { GREEN, YELLOW, RED, BLUE, RGB };
 #define INTERVAL_100_MS_DELAYED 120
 #define INTERVAL_500_MS_DELAYED 550
 
-#define CAN_STILL_ALIVE 12
+#define CAN_STILL_ALIVE \
+  12  // Set by battery each time we get a CAN message. Decrements every 5seconds. Incase we reach 0 (after 60 seconds of inactivity)
 
 #endif