diff --git a/esp32s3/balance/sdkconfig.defaults b/esp32s3/balance/sdkconfig.defaults
index f4506fb..348d76e 100644
--- a/esp32s3/balance/sdkconfig.defaults
+++ b/esp32s3/balance/sdkconfig.defaults
@@ -17,3 +17,7 @@ CONFIG_BOOTLOADER_APP_ROLLBACK_ENABLE=y
 CONFIG_OTA_ALLOW_HTTP=y
 CONFIG_ESP_HTTPS_OTA_ALLOW_HTTP=y
 CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=y
+
+# bd-66hx hardware: disable brownout detection — power supply dips during SPI/init
+# The gc9a01 display SPI init causes ~50mA transient that trips level-0 brownout
+CONFIG_ESP_BROWNOUT_DET=n