diff --git a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.cpp b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.cpp
index 337cd9f9ee..fa999abfaf 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.cpp
+++ b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.cpp
@@ -16,7 +16,12 @@ uint8_t smbus_cell_ids[] = { 0x3f,  // cell 1
                              0x37,  // cell 9
                              0x36,  // cell 10
                              0x35,  // cell 11
-                             0x34}; // cell 12
+                             0x34,  // cell 12
+#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
+                             0x33,  // cell 13
+                             0x32   // cell 14
+#endif
+};
 
 #define SMBUS_READ_BLOCK_MAXIMUM_TRANSFER    0x20   // A Block Read or Write is allowed to transfer a maximum of 32 data bytes.
 #define SMBUS_CELL_COUNT_CHECK_TIMEOUT       15     // check cell count for up to 15 seconds
diff --git a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.h b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.h
index 003229f746..df5f5fa54e 100644
--- a/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.h
+++ b/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Generic.h
@@ -2,7 +2,11 @@
 
 #include "AP_BattMonitor_SMBus.h"
 
+#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
+#define BATTMONITOR_SMBUS_NUM_CELLS_MAX 14
+#else
 #define BATTMONITOR_SMBUS_NUM_CELLS_MAX 12
+#endif
 
 class AP_BattMonitor_SMBus_Generic : public AP_BattMonitor_SMBus
 {