diff --git a/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
index 6223a0b0b1..99ca923b14 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/KakuteF7/hwdef.dat
@@ -144,15 +144,16 @@ define HAL_BOARD_TERRAIN_DIRECTORY "/APM/TERRAIN"
 
 define STM32_PWM_USE_ADVANCED TRUE
 
-# disable SMBUS battery monitors to save flash
-define AP_BATTERY_SMBUS_ENABLED 0
-
 # disable parachute to save flash
 define HAL_PARACHUTE_ENABLED 0
 
 # save FLASH, but leave above when flash issue is fixed
 include ../include/minimize_features.inc
 
+# disable SMBUS battery monitors to save flash
+undef AP_BATTERY_SMBUS_ENABLED
+define AP_BATTERY_SMBUS_ENABLED 0
+
 # setup for OSD
 undef OSD_ENABLED  # minimize_features.inc removes this
 define OSD_ENABLED 1
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-CAN/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-CAN/hwdef.dat
index 985bc0cbd1..404a4257cd 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-CAN/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-CAN/hwdef.dat
@@ -169,6 +169,7 @@ define HAL_BATT2_VOLT_SCALE 11.0
 include ../include/minimize_features.inc
 include ../include/minimal_GPS.inc
 
+undef AP_BATTERY_SMBUS_ENABLED
 define AP_BATTERY_SMBUS_ENABLED 0
 define HAL_PARACHUTE_ENABLED 0
 
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc b/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
index 25b6240267..f28223a3b8 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
+++ b/libraries/AP_HAL_ChibiOS/hwdef/include/minimize_features.inc
@@ -64,3 +64,17 @@ define AP_CAN_SLCAN_ENABLED 0
 
 # no beacon support on minimized boards:
 define AP_BEACON_ENABLED 0
+
+# restricted battery backends:
+define AP_BATTERY_BACKEND_DEFAULT_ENABLED 0
+define AP_BATTERY_ANALOG_ENABLED 1
+define AP_BATTERY_ESC_ENABLED 1
+define AP_BATTERY_UAVCAN_BATTERYINFO_ENABLED HAL_ENABLE_DRONECAN_DRIVERS
+define AP_BATTERY_SUM_ENABLED 1
+define AP_BATTERY_SYNTHETIC_CURRENT_ENABLED 1
+define AP_BATTERY_SMBUS_ENABLED 1
+define AP_BATTERY_SMBUS_GENERIC_ENABLED AP_BATTERY_SMBUS_ENABLED
+define AP_BATTERY_SMBUS_NEODESIGN_ENABLED AP_BATTERY_SMBUS_ENABLED
+define AP_BATTERY_SMBUS_SUI_ENABLED AP_BATTERY_SMBUS_ENABLED
+define AP_BATTERY_SMBUS_MAXELL_ENABLED AP_BATTERY_SMBUS_ENABLED
+define AP_BATTERY_SMBUS_ROTOYE_ENABLED AP_BATTERY_SMBUS_ENABLED